CHIEFLY OF THE UNITED STATES. 121 



Melania Boninensis. pi. 22, fig. 15. 



Testa canoellata, conoidea, teniii, tenebroso-cornea ; spira subelevata; suturis parum improssis; anfrac- 

 tibus instar septenis, planulatis ; apertuva parva, pyriformi, superue angulata, intus albida ; labro aouto ; 

 columella torta. 



Shell caucellate, conoidal, thin, dark horn color ; spire somewhat elevated ; sutures 

 slightly impressed ; whorls about seven, flattened ; aperture small, pear-shaped, angular 

 above, within whitish ; outer lip acute; columella twisted. 

 Proc. Acad. Nat. Sci., 1856, p. 14.5. 



Hah. — Bonin Islands, M. Burrough, M. D. 



My cabinet. 

 Diam. •23, Length "65 inch. 



Remarks. — A single specimen only of this species was submitted to me by Dr. Bur- 

 rough. It was obtained during one of his voyages to the East, and has remained with 

 me many years in hopes of other specimens coming to hand, that I might describe it 

 more accurately. It is finely cancellate all over. Below the suture it is flattened, 

 and this modifies the aperture into a pyriform shape. In outline it is near to ajfinis, 

 herein described, but is not quite so large. The apex being eroded, the number of 

 whorls cannot be ascertained. There are five and a half visible, and there were pro- 

 bably seven or eight. 



Melania eubida. PL 22, fig. 16. 



Testa sti-iata, conica, crassa, ferruginea ; spira subelevata, acuminata ; suturis impressis ; anfractibus undenis, 

 planulatis, ultimo superne constrictis, ad apicem carinatis; apertura subgrandi, rotunda, intus rubi- 

 cundula ; labro acuto ; columella incrassata. 



Shell striate, conical, rust-red ; spire rather elevated, acuminate ; sutures impressed ; 

 whorls eleven, flattened, the last one being constricted above ; aperture rather large, 

 rounded, within a little reddish ; outer lip acute ; columella thickened. 

 Proc. Acad. Nat. Sci., 1856, p. 1-45. 



iTrt^.-^Mexico, Hon. J. R. Poinsett. 



My cabinet and the cabinet of the American Philosophical Society. 

 Diam. '57, Length 1'30 inch. 



Remarks. — A number of specimens of this species were brought by Mr. Poinsett 

 many years since from Mexico, and probably from the Table Land. It came with a 

 number of JJnio cuprinus (nobis.) It is remarkable for its color, its very thin epi- 

 dermis, and its solidity and stricture on the upper part of the lower whorl. I have 

 but two specimens before me, both of which are equally constricted. In outline it is 

 near to fcBda (nobis,) but has a much larger and rounder lower whorl. In color they 

 differ entirely. The aperture is rather more than one-third the length of the shell. 



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