180 



specimens frequently ocenr without 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 be separated under the above 

 name. Lamarck describes a variety h, and although he quotes 

 the true Linnrean name of dathrus, 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 &ct 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. 



SCALARIA 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 costse with very numerous, approximate, equi- 

 distant, impressed lines : suture well impressed : body whorl with 

 about sixteen cost». 



Obs. 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. — Specific character. Costae on the body 

 whorl about eighteen : peristome very robust ; body whorl with a 

 raised line. 



Scalaria lineata, noh. Journ. Acad. Nat. Sci. vol. 2, p. 242. 



Obs. — This species is not uncommon on our southern coast. Its 

 length is about half an inch. A variety occurs, of which the 

 costae 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 



