6 AMNICOLA 



It is fouud on wet earth and roots of trees on the margin of a small 

 stream near Cincinnati. (^Haldeman.) 



Cyclostoma cincinnatiensis, Lea, 1843, Tr. Am. Phil. Soc. VIII, 229, pi. 



vi. f. 62. 

 Amnicola sayana, Haldeman, Mon. p. 19, pi. i, f. 11 ; pt. 4, p. 4 of 



wrapper. 

 Paludina sayana, Kctster in Chemn. ed. 2, p. 49, pi. ix, f. 30 — 32. 



The name proposed by Mr. Lea being preoccupied, I have fol- 

 lowed Haldeman, in adopting that proposed by Anthony, but 

 never published by him. Troschel (Gebiss der Schnecken p. lOT, 

 pi. viii, f. 1) figures the lingual membrane of this species; Iso. 

 8934 of the collection is from Mr. Anthony. No. 8911 is labelled 

 by Mr. liea " Cyclostoma cincinnatiensis.''^ 



Found in Ohio and New York. 



Mr. Lea's description and an enlarged view of the outline of 

 his figure here follow : — 



Cyclostoma cincinnatiensis. — Shell elevated in the form of a cone, 

 smooth, shining, transparent, umbilicate ; whirls 6, apex 

 Fig. 9. obtuse ; margin of the lip reflected. 



Vicinity of Cincinnati. Diam. .13, length .22 inch. 

 A small species which has been sent to me several times 

 by my brother, who seems first to have observed it. It is 

 about the size, and nearly the color, of Paludina litnosa 

 Say. It is found on wet earth and roots of trees, on the 

 margin of a small stream near Cincinnati. 



§ 2. Orbicular. 



Amnicola poratajSAT — Shell obtusely conic or subglobose ; volu- 

 tions four, convex, obsoletely wrinkled across ; spire obtuse ; labrum and 

 labium equally rounded, meeting above in a subacute angle ; 

 Fig. 10. the upper edge of the latter appressed to the preceding whirl ; 

 umbilicus very distinct. 



Inhabits Cayuga Lake. Cabinet of the Academy. 

 This species, which was found by Mr. Jessup, is rather larger 

 and more globose than P. limosa to which it is allied, and has a 

 more distinct umbilicus. It resembles P. decipiens of Ferrus- 

 sac, but is much less acute, and rather smaller. (^Say.) 

 Paludina porata, Say, Journ. A. N. So. Phila. Ill, p. 174: Binney's ed. 

 p. 69. — KiJSTER in Chemn. ed. 2, p. 63, pi. xii, f. 4, 5. — Philippi 

 Abbild. 137, t. II, f. 10. 

 Amnicola porata, Haldeman, Mon. p. 13, pi. i, f. 8. — Not of Gould, Inv. 

 (= //moso). -De Kay, N. Y, Moll. p. 88, pi. xxxv, f. 333— Chenp, 

 Man. de Couch. II, 308 ; fig. 2194. 



