FAMILY HELICID.E HELIX. 47 



H. auriculata. Polygyra id. (Say, Ac. Sc. Vol. 1, p. 277. Pl. 3, fig. 28 in this volume.) Shell 

 small, flattened above. Spire little elevated, often eroded. Whorls 5, rounded beneath, obtusely 

 carinate above, regularly wrinkled across. Umbilicus small within, dilated without. Lip and 

 pillar-lip irregularly dilated, and nearly closing the aperture, with a faint resemblance to an ear. 

 Color, bluish white to reddish brown. Diameter, • 4 ; height, 0-2. Florida. 



This forms the typo of a new genus proposed by Say, under the name of Polygyra, but which 

 has not been adopted by subsequent naturalists. I have deemed it important to give a figure, as there 

 is none extant to which the American naturalist has convenient access. 



H. sayi. (Wood, Index Suppl. pl. 7, 34 n.) Shell small. Lip reflected, forming a narrow sulcus 

 towards the open umbilicus. Color, brownish. 



Closely allied to, if not identical with the preceding. 



H. septemvolva. Polygyra id. (Say, Ac. Sc. Vol. I, p. 278. Ferbssac, pl. 51, fig. 6.) Shell 

 much depressed, discoidal. Spire not prominent. Whorls 7, perfectly lateral, compressed and 

 depressed, with lines and grooves above; a projecting keel on the upper edge of the body-whorl. 

 Aperture subreniform, not contracted. Outer lip reflected; pillar-lip projecting inward into an 

 angle or tooth. Umbilicus moderate, attenuated to the apex, so as to show the volutions. Diameter, 

 0-3-0-4. Georgia, Florida. 



H. avara. (Say, lb. Vol. 1, p. 277.) Spire convex. Whorls four, rounded, wrinkled, and furnished 

 with many short robust hairs. Aperture with two projecting obtuse teeth on the outer lip, separated 

 by a deep sinus ; pillar-lip connected to an elongate lamelliform oblique tooth on the penultimate 

 whorl. Umbilicus moderate, not showing the volutions. Diameter, • 25. Florida, Carolina. 



H. aspersa. (Ferussac, Moll. pl. 18.) 



* * Whorls angular. 



H. spinosa. Carocolla id. (Lea, 1. c. Vol. 4, p. 104, pl. 15, fig. 35. Binney, Bost. Jour. Vol. 

 3, pl. 11; and Pl. 6, fig. 114 a. b. of this book.) Shell lenticular, thin, diaphanous, imperforate. 

 Carina acute, with minute spines. Whorls 6. Spire nearly planular, being guarded by a long 

 tooth on the columella. Outer lip irregularly thick, angulated near the upper termination. Diame- 

 ter, 0-6. Alabama. 



This belongs to the genus Carocolla of Lamarck, and Helicigona of Ferussac, but is considered 

 by later writers as a merely artificial section. 



H. cumberlandiana. Carocolla id. (Lea, Am. Tr. Vol. 8, p. 229, pl. 6, fig. 61.) Shell lenticular, 

 carinate, striate, widely umbilicate, impressed above and below the carina. Whorls 5. Aperture 

 angular, within furrowed. Lip acute. Color, whitish brown, spotted. Length, 0-14; diameter, 

 • 54. Tennessee. 



H. lasmadon. (Philips, Ac. Sc. Vol. 8, p. 182.) Shell minute, moderately elevated, lenticular, rather 

 thick, umbilicate, faintly striate. Aperture compressed, with one or two lamellar teeth. Color, 

 light horn. Alabama. 



