ANGITREMA. 



19 



C. Bochj-ichorl icith a central roio of tubercles. 



6. A. rota, Reeve. 

 lo rota, Eeeve, Monog. lo, sp. 13, April, 1800. BiiOT, List, p. 29. 



Description. — Shell globosely turreted, thick, ponderous, yellowish, 

 encircled at the base by a browu band, olive ; whorls few, rudely cou- 

 cavely sloping, faintl}^ striated, encircled round Pjo. ^2. 



the periphery with large, obliquely compressed 

 tubercles; columella short, but little twisted. 



Habitat. — United States. 



Observations. — A solid, globosely turreted 

 shell, prominently armed with tubercles, which 

 are compressed obliquely into fans, like the 

 fans of a water-wheel. — Beeve. 



The figure is copied from Reeve. I 

 have never seen this species, the type of 

 which was in the collection of the late 

 Hugh Cuming, Esq., London ; it may be only a remarkable 

 specimen of A. Jai/wia, Lea, 



7. A. armigera, Say. 



Melania armigera. Sat, Jour. Acad. Nat. Sci., Ist ser., ii. p. 178, Jan., 1821 Binnet's 

 Reprint, p. 71, Bin'NEY, Clieck Li&t, No. 21. DeKay, Moll. N. Y., p. it;?. Jat, 

 Cat.,4theilit., p.272. TnooST, Cut. Wiieatlev, Cat. Shells U. S., p. 24. Cat- 

 i.ow. Conch. Noinenc, p. 135. Hani,ev, Conch. Misc. Melania, t. 7, f. CO. 



lo armigera, Say, Reeve, Monog. lo, f. 11. Adams, Genera, i, 299. 



Description. 

 Fig. 53a. 



Tig. 53. 



Shell tapering, brownish horn-color; volutions about 

 six, slightly wrinkled ; spire near 

 the apex eroded, whitish; body- 

 whorl with a revolving series of 

 about five or six distant, prom- 

 inent tubercles, wliich become 

 obsolete on the spire, and arc 

 concealed by the revolution of 

 the succeeding whorls, in con- 

 sequence of which arrangement 

 there is the appearance of a sec- 

 ond, smaller, and more obtuse 

 subsutural series of tubercles on the body-wliorl; two or three obso- 



