The most striking part of the coloration of the alcoholic specimens is formed by the marking of the elytra. The inner and posterior margin of each elytron is marked with a dark line, which in the inner posterior quadrant is continued as a pigment patch, of a slightly lighter shade than the margin, to reach the elytrophore attachment (plate 1, fig. 17). When the elytra are in place the general effect is that of a broad median dark band on each elytron, the lateral posterior quadrant of each lighter-colored, but surrounded by a narrow mar ginal band. The remainder of the dorsal surface is uncolored, except that at the beginning of the posterior quadrant prominent black spots appear on the base and apex of some parapodia, usually only on elytra-bearing somites. Approximately the last 10 somites have a median dorsal pigment patch and 6 are uncovered by elytra.
Ventrally the margins of the mouth are pigmented, the pigmentation con tinuing on either side as a single patch at the base of each parapodium, toward the posterior end extending so as to cover a large part of the ventral surface.
The head is only slightly rounded, a little longer than broad, the anterior notch very narrow (plate 1, fig. 18). Peaks of head very slightly marked off from the ceratophores of the lateral tentacles, the latter about one-quarter as long as the head and densely pigmented. The terminal joint of the tentacle is s'ender, its entire length not more than twice that of the ceratophore, its tip filiform. The basal half of this terminal joint is pigmented, the terminal half being also colored, but not so deeply as the basal; apex uncolored. The median tentacle had been lost, but its ceratophore is large, overlapping the lateral ones, pigmented at its end. Palps rather stout, about 3 times as long as the head, their middle third pigmented. On the type there remained one ventral tentacular cirrus, slender and extending to about the middle of the palp, with a median and terminal pigment patch; all other tentacular cirri were lost, as were most of the dorsal cirri. Those dorsal cirri remaining were slender, gently tapering to the apex, more or less pigmented for the terminal half, but with a subterminal white patch. The anal cirri are larger than the dorsal and entirely pigmented.
The elytra are very similar in character throughout the body, with an entire margin and without papilla; they are transparent, so that although they overlap, the pigment of the under one shows through the upper and gives the impression of a continuous line.
The notopodium of the first parapodium is thicker than the neuropodium and extends about half as far from the body. It bears from the bottom of an oval terminal depression a tuft of heavy seta, of which the ventralmost are especially large (plate 2, fig. 1). The acicula extends into a conical expansion ventral to this depression.
Neuropodium much wrinkled, its dorso-anterior angle prolonged into a conical process; it carries a single acicula and large setae. The ventral cirrus
is large, equal in size to the dorsal cirrus of the second parapodium; its elytron was broken from the specimen figured, only its ceratophore being represented.
The second parapodium has a less developed notopodium than the first, but the seta in the two are very similar. Neuropodium more conical than in the first, with a finger-shaped process at end of antero-dorsal lobe. Ventral cirrus two-thirds as long as the neuropodium, the dorsal cirrus longer than the parapodium, tapering gradually to the apex.
Toward the posterior end (plate 2, fig. 2) of the fifteenth from the posterior end the ventral cirri become very small, while an anterior lobe appears in the notopodium. In other respects the parte of the parapodium have a relative form much as anteriorly, and the very large seta continue in the notopodium.
The large setae of the dorsal tuft vary much in size, but the ventral ones are largest. They have a striated axis, which terminates in a blunt point and show traces of rows of minute teeth along the shaft. The apices were invar iably covered with a thick brownish incrustation, which made it impossible to determine their exact form. The seta of the ventral bundle (plate 2, fig. 3) with long tapering shaft and a subterminal tooth at some distance below the apex. The expanded portion of the seta with numerous rows of very minute teeth, apparently extending entirely around it, but larger on the convex surface; these stop at the subterminal tooth.
Type in American Museum of Natural History. Cotype in the Yale Uni versity Museum.
Pontogenia maggie Aagener.
A single specimen, dredged July 19, 1915, south of Loggerhead Key, agrees closely with Augener's description, though if his figure of the head is accurately drawn his specimen was poorly preserved. While there are lateral lobes as he figures, they are not as deeply incised as is shown in his figure and they are carried on the dorso-lateral surface, so that the head is broadest at its junction with somite 1. The median tentacle is shorter than the dorsal cirrus and very delicate. Each eye-stalk carries dorsally a small eye, and antero ventrally a much larger one, somewhat as in Ehlers's Pontogenia sericoma (Ehlers, 1887, plate 7, fig. 2), but unlike that species these are carried on prom inent stalks. Brown papilla very abundant over the entire ventral surface, but occurring also on the head and dorsal surfaces of the elytrie, form a notice able feature of this species.
Each somite with one or two very heavy, long, glassy seta, longer than diameter of body and lying across its dorsal surface. If I understand cor rectly Augener's description, these are distinct from his "starke dorsals borate," which is shorter than these. I do not find in the latter any minute tubercles and would suggest that perhaps what he saw were particles of foreign matter.