SPECIES.
C. Caroliniensis. Shell cordate, turgid, brown on the disk, with a yellowish or greenish margin and sub-margin, surface with numerous membranaceous wrin kles ; umbo much eroded ; beaks distant; two of the primary teeth caniliculate at tip.
Length, one inch and one-fourth ; breadth, one inch and seven-twentieths. C'liclas Caroliniensis, Bosc.
Inhabits the rivers of South Carolina, and Georgia, but is not found so far north as Pennsylvania. We found it in plenty near Charleston, South Carolina, and in St. Johns' River, East Florida.
The shells here described are in the collection of the Academy of Natural Sciences of Philadelphia.
It was originally the intention of the writer of this article to insert here, not only descriptions of the fresh water and land shells, but those of the coast also ; finding, however, that the descriptions of the latter were by far too voluminous to be comprised within the space allot ted to this article, and that they had more generally found a place in the sys tems, the design is, with respect to this work, necessarily relinquished. To all
the species here described, with the ex ception of three or four, we have been constrained to adapt specific names ; but should it appear that we have been anti cipated by the labours of some recent conchologist, whose writings we have no opportunity to consult, we shall readily bow to the right of priority, which ought, unquestionably to be on all occasions im perative and exclusive.
The primary divisions of the Linnman system, in the latest edition of the " Sys tema Naturz," as before observed, con sist of three orders, Multivalve, Bi valve, and Univalve, each of which is sub divided into genera. The Multivalves contain the chiton, leapas and pholas: the Bivalves, mya, solen, tellina, cardium, mactra, donax, venus, spondylus, chama, arca, ostrea, anomia, mytilus, and pinna ; and the Univalves, argonauta, nautilus, corms, cyprwa, bulla, voluta, buccinum, strombus, murex, trochus, helix, nerita, haliotis, patella, dentalium, serpula, teredo, and sabella. Which see. See also SHELLS.