14 



LAND AND FRESH-WATER SHELLS OF N. A. [PART IV. 



Description. — Shell short and ponderous ; body- whorl crowned 



Fig. 43. Fipr. 42. Fig. 44. 



with a row of conical tubercles; labium with a callus above and 

 below ; aperture elliptic, with a sinus at each extremity. 



Length, 3 inch. 



Habitat.— EsLSt Tennessee- 



Observations. — Differs from Melania salebrosa, Conrad, in having but 

 a single row of tubercles, and a more abrupt shoulder. — Haldeman. 



Generally but one row of tubercles is developed on this 

 species, but occasionally a second and less pi'ominent row is 

 visible. The whorls are more shouldered, and the tubercles 

 larger and less numerous than in L. salebrosa, Conrad. In 

 general form it approaches L. Ticoweyi, Lea. It is the largest « 

 and most ponderous species of the genus. 



Mr. Lea considers geniculata to be the same as salebrosa. 



2. A. salebrosa, Conrad. 



Melania salebrosa, Conrad, New Fresh- Water Sheila, p. 51, t. 4. f. 5, 1834. Chentt, 

 Reprint, p. 24, t. 4, f. 13. DeKay, Moll. N. Y., p. 100. WHE.'i.TLEr, Cat. Shells 

 U. S., p. 25. Jay, Cat., 4th edit., p. 274. 



Anculotus srilebrosus, Conrati, Reeve, Monog. Anc., 1. 1, f. 6 (bad figure). 



Leptoxis salebrosa, Conrad, Brot, List, p. 25. 



Lithasia salebrosa, Conrad, Binney, Check List, No. 303. Adams, Genera, i, 303. 



Fig. 45. 



Fig. 46. 



Description. — Shell short suboval; thick, ventricose, with a series 

 of very elevated nodes on the shoulder of the 

 body-whorl, and generally two series of smaller 

 nodes beneath ; spire very short ; apex much 

 eroded; aperture about half the length of the 

 shell, contracted; within purplish; columella 

 with a callus above, and another near the 

 base. 



Observations. — This singular shell approaches the genus Anculotus in 



