NASSID^. , 155 



obtain in tlie TerebridsB. Pusionella, moreover, has a concentric 

 operculum, witli its nucleus near the middle of the inner margin. 

 Perhaps the figured operculum of Northia is abnormal ; it has 

 that appearance. I think that if these shells had not been 

 assigned to the Nassidse or to any other family, I would have 

 placed them in Terebridae ; as it is, I prefer to allow them to 

 remain here, rather than possibly complicate the subject by 

 changing their position. 



Truncaria, Ads. and Eeeve. 



Distr. — 6 sp. Philippines, Panama, L. California. 2\ modesta 

 Powis (lii, '75). 



Shell acuminately oblong, thick ; suture of the spire channeled ; 

 aperture anteriorly dilated, posteriorly subemarginated ; columella 

 arcuated, abruptly truncated in front, with a single anterior fold. 

 Dentition unknown. 



BuLLiA, Gray. 



Distr. — 25 sp. S. Africa, Indian Ocean, E. and W. Coast of 

 S. America, Taheiti. B. callosa, Gra}^ (lii, 1d\ 



Animal without eyes ; tentacles long, and slender. Foot enor- 

 mously expanded, and bifid behind in the typical species. 

 Operculum pointed, nucleus apical. 



Shell ovate or turreted ; spire more or less acuminated, sutures 

 enameled ; inner lip excavated in the middle, callous posteriorly ; 

 aperture oval, moderate. 



BuUia (restricted) has a raised band of enamel round the 

 sutures of the whorls, as in Ancillaria. The animal has the 

 faculty, according to M. Quoy, of absorbing, through the pores 

 of its foot, a great quantity of water, which it ejects, when dis- 

 turbed, in various directions ; it is caught by baiting lines with 

 bits of flesh. The genus is Oriental, mostly S. African in distri- 

 bution, and reminds one of the Arctic genus Yolutharpa. 



In Woodward's " Manual of the Mollusca," BuUia is errone- 

 ously made a synonym of Anaulax, Roissy, a fossil form of 

 Ancillaria. 



BUCCiNANOPS, d'Orb. Shell with the whorls somewhat angu- 

 lated, and with a rounded or nodulous band next the sutures. 

 Embraces three species from the southern parts of the Coast of 

 South America. They are of rude growth, usually with a flat- 

 tened shoulder below the sutures. B. annulata^ Lam. (lii, *\*l). 



PSBUDOSTROMBUS, Klein. (Leiodomus, Swains.) Shell elon- 

 gated, smooth, without epidermis, last whorl ventricose ; spire 

 acuminate ; aperture ovate, columella arched, smooth or trans- 

 versely striated, outer lip thin. No enamel round the sutures. 

 B. polita, Linn, (lii, 78 . 



ADiNUS, H. and A. Adams. Shell subulate, spirally striated ; 

 columella abruptly truncated at base; inner lip corrugated, with 



