Plate 2. fig. 5.
Donov. Brit. Shells. tab. 87, Helix Vivi para.
Lister. conch. tab. 126, fig. 26 ; Cochlea vivipara faseiata.
It is doubtful whether or not this is the same as the Vivipara, but it certainly ap proaches very near to it ; we however refer it to that species until a specific dif. ference can be indicated, which at pre sent we are unable to do ; the spire of this species is rather more obtuse, and the suture not so deeply impressed, as in the figures of the European specimens above mentioned.
6. P. Dissinzilis. Shell conic, dark horn colour or blackish ; whorls about three, with obsolete, distant wrinkles, and an abrupt, acute, prominent, carina ted line, which revovles on the middle or the body whorl, and is concealed on the spire by the suture ; as not indented, aperture oval, half as long as the shell, within sanguineous beneath the caring, and at base, and apex ; columella emargi 'fated, a little flattened at the base.
Length about two-fifths of an inch.
Var. A. Carina obsolete on the ventral portion of the body whorl.
Var. B. Carina distinct on the spiral whorls, owing to their more oblique revo lution.
The surface of the whorls of the spires is generally covered with inequal calca reous matter, resembling a fortuitous ac cumulation of mud or earth on that part, but which appears to be superposed by the animal, probably with the intention of retaining a proper specific gravity. The
apex is often truncated.
This species was found by Mr. Thomas Nuttall, during a journey to Pittsburg.
7. L. Decisa. Shell subconic, oliva ceous, truncated at the apex; whorls four, wrinkled across and banded with mtnute distant striae; terminal whorl very short ; suture impressed and conspi cuous; aperture subovate, more than half of the length of the shell, entire ; within bluish white. Operculum coriaceous, elevated on the disk and concentrically striated.
Length one inch ; breadth three-fourths of an inch.
Plate 2. fig. 6.
Cochlea virginiana é ,lava viridescens, non fasciata. Lister. conch. tab. 127. fig. 27.
The young shells resemble L. subcari nata, but the whorls are destitute of an elevated line, the suture is not so deeply impressed, and the aperture is narrower above.
Animal with the foot large, suddenly a little dilated each side before and truncate in front, widely ; foot livid, thickly macu lated with irregular orange spots, which are much smaller beneath ; head and ten tacula spotted with orange; eyes on a pro minent angle, at the external base of the tentacula.
I found the animal viviparous iu Octo ber ; the young shell had then three complete whorls, which were spirally stri ated.