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



I pay a deserved compliment to one of the most industrious and 

 ardent naturalists in our Western States; though in so doing, I re- 

 luctantlj' depart from a wholesome recommendation formally pro- 

 mulgated, first by the Scientific Congress of Great Britain, and 

 afterwards by that of America, It is to be regretted that this recom- 

 mendation has been so little heeded, but where the recognized laws 

 of nomenclature hardly restrain, mere suggestions will be of little 

 avail. — Eedfield. 



This ver}'- distinct species attains a large size, ranking in 

 this respect with E. crassa. In the collection of Gould are 

 specimens collected in west Georgia. 



10. E. crassa, Haldeman. 



Anculosa crassa, Haldeman, Monog. Limniades, No 4, p. 3 of Cover, Oct. 5, 1841. 

 Anculotus crassus, Haldeman, Jay, Cat., 4tli edit., p. 27(5. Reeve, Monog. Ancu- 



lotus, t. 2, f. 14. 

 Leptoxis crassa, Haldeman, Monog. Lept., p. 2, t. 1, f. 19-23. Binney, Check 



List, No. 350. Brot, List, p. 24. Haldeman, Adams, Genera, i, p. 307. 

 Leptoxis pisum, Haldeman, Monog. Lept., p. 4, t. 3, f. 82. Binney, Check List, 



No. 378. Bkot, List, p. 25. Haldeman, Adams, Genera, i, p. 307. 

 Anculosa turbinata, Lea, Proc. Acad. Nat. Sci., 54, 1831. Jour. Acad. Nat. Sci., v, 



pt. 3, p. 254, March, 1863. Obs., ix, p. 76. 



Description. — Shell conical or globose, ponderous ; whorls five, flat 

 or slightly convex; spire exserted; aperture ovate, with a well 

 Fig. 661. Fig. 660, marked columellar notch; labium thick; 



color brown. 



Habitat. — Clinch? River, Tennessee. 

 Length, \ of an inch. 

 Observations. — Differs from A. prcerosa 

 by the better developed spire and notch. 

 Haldeman 



In his " Monog. of Leptoxis," Professor Haldeman informs 

 us that this species lives in tranquil waters near their margins, 

 and not in rapid currents, like the other species of the genus. 

 This is certainly an unexpected habit in a species so pon- 

 derous and it may be doubted whether the species habitually 

 seeks such stations. The species appears to be rather common 

 in North Alabama, whence beautiful specimens have been 

 received. 



The following is a synonyme : — 



