AMNICOLA. y 



Aiunicola cincinnatiensis, Anthony. — Sliell Fig. 15. 



somewhat ventricose, subumbilicate, color delicately green, a 



whirls four, smooth ; spire entire at the apex and promi- (^ 



nent ; suture deeply impressed ; aperture much dilated, ^\J 



approaching to orbicular, nearly half the length of the Amnicola 



shell ; length one-fifth of an inch. Cindnnatiensis. 



Found in the canal at Cincinnati, clinging to small stones. 

 (^Anthony.) 

 Paludina cindnnatiensis, Anthony, Boston J. N. H. Ill, pt. 1 and 2, 

 p. 279, pi. iii, fig. 3, 1840.— Kuster in Chemn. ed. 2, p. 52, pi. s, f. 

 13, 14. 

 Amnicola cindnnatiensis, Haldeman, Mon. p. 9, pi. Fig. 16. 



i, f. 4.— De Kay, N. Y. Moll. 88. 

 Paludina emarginata, Kijstek, Ch. ed. 2, p. 50, pi. 

 X, f. 3, 4. 



" This is the most robust species hitherto 

 noticed among us, and is, in form, a miniature 

 representation of Paludina ponderosa, except 

 that it is decidedly umbilicated." {Haldeman.) Paludina 



Specimens labelled by Mr. Anthony are in (Z^fZles) 

 the collection of the Smithsonian. Kiister's 

 description now follows. His figure is copied in fig. 16. He 

 quotes Lymnaeus emarginatus, Say as a synonym on authority of 

 Bronn. 



Paludina emarginata, KtJSTEK. — Shell small, narrowly rimate, ovate conic, 

 apex eroded, sub-truncated, shining, thin, delicately striate, dark horn 

 colored ; spire conic, whirls 4, convex ; suture deep ; aperture ovate ; 

 peristome straight, acute, its columellar portion reflected. 



Amnicola granum, Say— Shell conic-ovate ; whirls not percep- 

 tibly wrinkled, convex ; suture deeply impressed ; aperture orbicular, 

 hardly angulated above ; labium with the superior edge appressed to the 

 surface of the penultimate volution ; umbilicus rather small, profound. 



Length less than one-tenth of an inch. Inhabits Pennsylvania. 



This very small species is found in plenty in the fish ponds at Harrow- 

 gate, crawling on the dead leaves which have fallen to the bottom of the 

 water. It resembles P. lustrica, but is a smaller, less elongated shell, and 

 the superior portion of the labium is not an unaltered continuation of the 

 lips as in that shell, but is appressed to the surface of the penultimate 

 whorl in the usual manner of calcareous deposition upon that part. {Say. ) 



Paludina grana, Say, Journ. A. N. Sc. II, p. 378 ; Binney's ed. p. 110. 

 Amnicola granum, Haldeman, Mon. p. 17. — De Kay, N. Y. Moll. 88. 



Ranges from Lake Superior to "Virginia. 



