ANCULOTUS. 



Plate I. 



Genus ANCULOTUS, Say. 



Testa suiglobosa, inlerdum conico-turbinata, solida, interdum 

 tenuicula, anfractibus pawns, scepissime Imvigatis, seepe 

 granatin ant carinatis, columella plus minus callosd, 

 aperturd oblongo-ovatd, ad basin plerumque sinuatd. 



Shell rather globose, sometimes conically turbinated, solid, 

 sometimes rather thin, whorls few, mostly smooth, 

 often grained or keeled, columella more or less cal- 

 lous, aperture oblong-ovate, generally sinuated at the 

 base. 



The genus Anculotus is little better than a receptacle 

 for the dwarf species of Melaniadts, not hitherto separated, 

 as in the case of Melatonin, by any very obvious pecu- 

 liarity. The first twenty-six species of our monograph, 

 forming Plates I. to III., are a very natural group, of solid, 

 globose form, sometimes tubercularly grained, but mostly 

 smooth, in which the base of the aperture is either sinuated, 

 or has, at least, some indication of a sinus. The re- 

 mainder are of a thinner substance, and partake more of 

 the character of Paludina ; yet there is still an indication 

 of the sinuated aperture, but it varies, and the species 

 vary much among themselves. 



The Anculoti are all from the United States, principally 

 Tennessee, Alabama, Ohio, and Virginia. 



Species 1. (Mus. V. d. Busch.) 



Anculotus nuperus. Auc. lestd obeso-ocai 'a, flavescente- 

 fuscd,anfractibu& declivibus, medio gibbosis, transversim 

 verrucoso-tuberculaiis, columella basi attenuatd, aper- 

 turd trapeziformi. 



The new Anculotus. Shell stoutly ovate, yellowish- 

 brown, whorls sloping, gibbous in the middle, trans- 

 versely wart-tubercled, columella attenuated at the 

 base, aperture diamond-shaped. 



Melania nupera, Say, American Conch, pi. 8. f. 1 to 3. 

 Melanopsis semi-granulosa, Deshayes. 



Hob. Ohio, United States. 



This shell partakes in a measure of the characters of 

 Melania and Eemisinus as well as of Anculotus. The 

 nodules have a peculiar transversely stretched wart-like 

 appearance. 



Species 2. (Mus. Cuming.) 



Anculotus consanguineus. Auc. testa subgloboso- 

 ovatd, flavescente-olivaced, spird brevi, acute acumi- 

 nata, anfractibus couvexis, lavibus, superne tumide ro- 

 tundatis, aperturd ovatd, columella iucurvd, basi ar- 

 cuatd. 



The belated Anculotus. Shell somewhat globosely 

 ovate, yellowish-olive, spire short, sharply acuminated, 



whorls convex, smooth, tumidly rounded at the upper 



part, aperture ovate, columella incurved, arched at 



the base. 

 Melania consanguinea, Anthony, Ann. Lye. Nat. Hist. New 



York, 1854, p. 125. pi. 3. f. 26. 

 Hob. Indiana, United States. 



A globosely ovate shell, with a short but sharply acu- 

 minated spire, and having very much the appearance of a 

 Chilina. 



Species 3. (Mus. Cuming.) 



Anculotus gibbosus. Auc. testa globoso-turbinatd, 

 rufo-olivaced, spird parvd, anfractibus quatuor, ultimo 

 multo majore, declivi-rotundatis, ad suturas minute 



plicato-striatis, aperturd suborbiculari, appresse iu- 

 curvatd. 



The gibbous Anculotus. Shell globosely turbinated, 

 rufous-olive, spire small, whorls four, the last much 

 the larger, slopingly rounded, minutely plicately 

 striated at the sutures, aperture nearly orbicular, co- 

 lumella appressly incurved. 



Lea, Trans. American Phil. Soc. vol. ix. p. 15. 



Hah. Tenuessee, United States. 



A small obliquely rounded species, resembling a small 

 variety of the common Periwinkle in general aspect. 



Species 4. (Mus. Cuming.) 



Anculotus Florentianus. Anc. testa globoso-ovutd, so- 

 lidiusculd, olivaced, obscurli fasciald, anfractibus qua- 

 tuor ad quinque, couvexis, hevibus, superne obtuse an- 

 gulatis, ad unguium rude nodatis, aperturd ovatd, co- 

 lumella appresse attenuatd. 



The Florentine Anculotus. Shell globosely ovate, 

 rather solid, olive, obscurely banded, whorls four to 

 five, convex, smooth, obtusely angled at the upper 

 part, rudely noduled at the angle, aperture ovate, co- 

 lumella appressly attenuated. 



Melania Florenliana, Lea, Trans. American Phil. Soc. vol. 

 viii. pi. 6. f. 53. 



Hah. Tennessee River at Florence, Alabama, 



Coronated with a rude sculpture of blunt nodules, be- 

 low which there is sometimes a faint indication of a secoud 

 row. 



Species 5. (Mus. Cuming.) 

 Anculotus lima. Anc. testa globoso-ovatd, crassd, sub- 

 ponderosd, olivaced, interdum viridi-fasciutd, intuspur- 

 pureo tiucld, spird breviusculd, anfractibus eonvexis, 

 medio et superne seriatim verrucoso-nodulatis, aper- 

 turd ovatd, utrinque sinuatd, columella coutortd. 



May, IS 60. 



