HELIX. Oi 



en effet, sur sa surface des stries irregulieres d'accroissement, qui 

 grossissent en s'approchant de 1'ombilic, se regulaissent dans cette 

 cavite, et deviennent assez semblables a celle qu'on reraarque dans 

 quelques solarium. Cette coquille est mince, diaphane, et d'une cou- 

 leur uniforme, d'un jaune verdatre tres pale. Les stries qui s'en- 

 forcent dans 1'interieur de I'ombilic n'ont pas ete representees assez 

 grosses dans les figures de cette ouvrage, auxquelles nous ren- 

 voyons. 



HELIX JEJUNA SAY vol. ii. p. 172, pi. xlii. fig. 2. 



Helix jejuna SAY, Journ. Acad. ii. 158; Binney's ed. p. 9. 



DEKAY, N. Y. Moll. p. 46. 



PFEIFFER, Mon. Hel. Viv. i. 147; iii. 124. 



BLAND, N. Y. Lyceum, vi. p. 341; Notes 31. 

 Helix Mobiliana TROSCHEL, Ar. f. Nat. 1843, ii. 124. 

 PFEIFFER. 1. c. iii. 219. 



This species is not referred to under this name in the 

 second volume of the Mollusks. Of all the authors referred 

 to in the synonymy, none have seen authentic specimens 

 of it. It has been known only by Say's description until 

 within a few months past, when it was suggested to me 

 by Dr. Pfeiffer that it might be identical with Mobiliana. 

 Specimens found at the original locality * by Mr. O. S. 

 Dorman, agree with Say's description sufficiently to con- 

 vince Bland of their identity. Since there is no hope of 

 ever deciding the question with certainty, it appears best 

 to follow the suggestion of these two authors, as that most 

 likely to be correct. 



In notes taken by Dr. Binney at the Jardin des Plantes, 

 it appears that a young shell is there labelled H. jejuna. 



Lea refers to this species in his remarks on several 

 species. As demonstrated by Bland, he had before him 

 clausa under this name. 



Anthony makes Mobiliana a synonym of clausa in his 

 Ohio Catalogue. 



* Mr. Dorman writes that the correct orthography of the spot is Cow/brd, and 

 not Cowfort. 



