A NCULOTUS. 



Plate IV. 



Species 27. (Fig. a, Mus. Cuming, 

 Fig. b, Mus. V. d. Busch.) 



Anculotus dissimilis. Anc. testa conico-turritd, in- 

 terdum subpyramidali, tenui, olivaceo-conicd, semipel- 

 lucidd, anfractibus ventricosis, ad peripheriam plus 

 minus acute carinalis, carina in anfractu ultimo sape 

 evanidd, aperturd ovatd, columella lenue appressd, pur- 

 pnreo tinctd. 



The dissimilar Ancdlotds. Shell conically turreted, 

 sometimes sub-pyramidal, thin, olive-horny, semi- 

 transparent, whorls ventricose, more or less sharply 

 keeled at the periphery, keel often disappearing in 

 the last whorl, aperture ovate, columella thinly op- 

 pressed, purple-stained. 



Paludina dissimilis, Say, Nich. Ency. 3rd ed. 1819. 

 Helix subcarinata, Wood. 

 Anculosa nigrescens, Conrad. 



Hab. Pittsburg, United States. 



This species is intermediate in its characters between 

 Anculotus and Paludina, and might fairly be taken as the 

 type of a distiuct genus. 



Species 28. (Mus. Cuming.) 



Anculotus Rogersii. Anc. testa fusiformi-ov aid, tenui- 

 culd, nigricante-olivaced, anfractibus declivi-convexis, 

 lavigatis, aperturd ovatd, fauce purpureo fasciaid, ad 

 basin sinuatd, columella ad basin tenui productd. 

 Rogers' Anculotus. Shell fusiformly ovate, rather 

 thin, dark-olive, whorls slopingly convex, smooth, 

 aperture ovate, interior purple-banded, sinuated at 

 the base, columella thinly produced at the base. 

 Melunia Rogersii, New Freshwater Shells, p. 7. pi. 9. f. 7. 



Hab. ? 



Allied in general typical character to the preceding spe- 

 cies, of a darker olive-colour, more produced at the extre- 

 mity of the columella. 



dark-olive, smooth, whorls sloping, then rather nar- 

 rowly rounded, somewhat depressed beneath, aper- 

 ture nearly circular, purple-stained, columella ap- 

 pressly produced, purple-stained. 



Anthony, Journ. Nat. Hist. Sci. Boston, vol. iii. pi. 3. 

 f. 4. 



Hab. Virginia, United States. 



Very closely allied indeed to A. Rogersii, though more 



depressly turbinated in form. 



Species 29. (Mus. Cuming.) 



Anculotus Kirtlandianus. Anc. testa conoideo-tur- 

 binatd, nigricante-olivaced, laevigata, anfractibus de- 

 clivibus, delude subangusle rotundatis, subtus depres- 

 siusculd, aperturd fere circulari, purpureo tinctd, co- 

 lumella appresso-productd, purpureo tinctd. 



Kirtland's Anculotus. Shell couoidly turbinated, 



Species 30. (Mus. V. d. Busch.) 



Anculotus Troostianus. Anc. testa ovato-turbinald, 

 larcigatd, nigricante-olivaced, obscure fasciatd, anfrac- 

 tibus superne concaviusculis, deinde rotundatis, aper- 

 turd fere circulari, columella calloso-refiexd. 



Troost's Anculotus. Shell ovately turbinated, smooth, 

 dark-olive, obscurely banded, whorls slightly con- 

 cave round the upper part, then rounded, aperture 

 nearly circular, columella callously reflected. 



Lea, Pro. Amer. Phil. Soc. 1841. 



Hab. Tennessee, United States. 



Of rather more solid and rounder growth than the two 



preceding species, without any trace of purple staining on 



the columella or aperture. 



Species 31. (Mus. Cuming.) 



Anculotus ebenum. Anc. testa oblongo-conicd, subru- 

 gosd, nigricante-olivaced, spird ampld, anfractibus de- 

 clivibus, obsolete rude plicatis, aperturd ovatd, colu- 

 mella ad basin appresso-productd. 



The ebon Anculotus. Shell oblong-conical, somewhat 

 rough, dark-olive, spire large, whorls sloping, obso- 

 letely rudely plicated, aperture ovate, columella ap- 

 pressly produced at the base. 



Melania ebenum, Lea, Trans. Amer. Phil Soc. vol. viii. 

 pi. 5. f. 7. 



Hab. Tennessee, United States. 



Rather an abnormal form of Anculotus, of rough conical 



growth. 



Species 32. (Mus. Cuming.) 



Anculotus patulus. Anc. testa turbinatd, fulvo-oliva- 

 ced, spird subexsertd, anfractibus rotundatis, ultimo 

 ventricoso, aperturd circulari, paluld, columella late 

 appressd, intense purpurea. 



May, 1800. 



