180 
specimens frequently occur witliout mucli appearance of tHe angle 
of the ribs, I have judged it prudent to place it as a variety of the 
dathrus, though I propose that it he separated under the above 
name. Lamarck describes a variety h, and although he quotes 
the true Linnsean name of datlmis, yet he has placed the species 
under a new name^ which^ agreeably to our principle relative to 
the exclusive right of priority of description, we cannot admit, 
notwithstanding the fact that the word dathrus may apply equally 
well to other species. 
Our shell varies much in proportional diameter. The body 
whorl, I believe, never becomes so large as in some specimens of the 
European dathrus, neither does the whole shell ever become so 
long as in other transatlantic specimens. PI. 27, two upper 
figures. 
ScALARlA MULTISTRIATA. — Specific character. Interstitial 
spaces with very numerous, impressed, transverse lines. 
Desc. Shell conic turreted, tapering to an actue apex, white, 
immaculate, imperforate : whorls about eight, in contact : costae 
regular, simple, not reflected, equidistant, moderately elevated ; 
spaces between the costae with very numerous, approximate, equi- 
distant, impressed lines : suture well impressed : body whorl with 
about sixteen costae. 
Ohs. Like the preceding, this is an inhabitant of the southern 
coast, and is about half an inch in length. Mr. Elliott sent me a 
specimen from Charleston, South Carolina, and obtained two on 
the coast of Florida. It is readily distinguished from the preced- 
ing species, by the very numerous small lineations that exist in the 
spaces between the ribs, and at right angles with them. PI. 27? 
lower right figure. 
SCALARIA LiNEATA.-~/S^ecy?c character. Costae on the body 
whorl about eighteen : peristome very robust ; body whorl with a 
raised line. 
Scalaria lineaia, noh. Journ. Acad. Kat. Sci. vol. 2,p. 242, 
Ohs. — This species is not uncommon on our southern coast. Its 
length is about half an inch. A variety occurs, of which the 
costm are almost obsolete, and another in which each rib, particu- 
larly of the body-whorl, has an impressed line. The margin of 
the mouth is greatly thicker than the ribs. What I have called 
