NASSIDAB. 155 
obtain in the Terebride. Pusionella, moreover, has a concentric 
operculum, with 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 Nassidze or to any other family, I would have 
placed them in Terebride; as it is, I prefer to allow them to 
remain here, rather than possibly complicate the subject by 
changing their position. 
Truncaria, Ads. and Reeve. 
Distr.—6 sp. Philippines, Panama, L. California. 7’. 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. 
Buti, Gray. 
Distr.—25 sp. S. Africa, Indian Ocean, E. and W. Coast of 
8. America, Taheiti. B. callosa, Gray (Iii, 79). 
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. 
Bullia (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 8. African in distri- 
bution, and reminds one of the Arctic genus Volutharpa. 
In Woodward’s ‘ Manual of the Mollusca,” Bullia 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, 77). 
PSEUDOSTROMBUS, 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. (iii, 78 . 
Apinus, H. and A. Adams. Shell subulate, spirally striated ; 
columella abruptly truncated at base; inner lip corrugated, with 
