HELIX. 19 g 



H. Texasiana the columellar lamella goes off more 

 directly from the lower junction of the lip, leaving no 

 intervening channel. Dr. Pfeiffer seems also to have 

 made still greater confusion, in his Monographia, by 

 regarding it as identical with the plicata and auriculata 

 of Say, which he places as synonyms under Moricand's 

 species, while he makes a distinct species of H. Troos- 

 tiana, Lea. It is impossible, indeed, to say which spe- 

 cies he actually had under his eye when he made his 

 description ; and, indeed, so far as may be made out from 

 the description, his H. ventrosula accords with the true 

 Texasiana. [G.] 



43. HELIX FATIGIATA, SAY. 

 PLATE XXXIX. FIUURES 2, 4. 



H. testa subplanulata, umbilicata, luteo-cornea ; anfract- 

 ibus striatis, striis distinctis, crebris, elevatis ; apertura sub- 

 orbiculari, contracts. ; labro albo, reflexo, intus bidentato ; 

 columella plica, sub-acuta, in medio aperturse projecta. 



SYNONYMS AND REFERENCES. 



Helix fatigiata, BINNEY, Boston Jouni. Nat. Hist. III. 388, pi. 19, f. 3. 



Helix Troostiana, PFEIFFER, Monosr. Helic. Viv. I. 419. 



Polygyra plicata, SAY, Nich. Encyc. IV. ; Juurn. Acad. II. 161. 



Polygyra fatigiata, SAY, Disseminator, &c. 



Polygyra Dorjeuillana, LEA, Am. Phil. Trans. VI. 107, pi. 24, f. 118. 



KIRTLAND, Ohio Report, 173. 

 Polygyra Troostiana, LEA, loc. cit. VI. 107, pi. 24, f. 119. 



DESCRIPTION. 



AXIMAL not hitherto noticed. 



SHELL plane above, or a little convex ; epidermis light 



VOL. ii. 25 



