MAZATLAN UNIVALVES 503 
Var.=Fusus turbinelloides, Rve. Conch. Ic. pl. 15, sp. 56. 
Fusus lignarius, + F. turbinelloides, + Neptunea pallida, H. & A. 
Ad. Gen. 1. 78, 79, 80. 
Comp. Pyrula lactea, Rve. Conch. Ic. pl. 3, sp. 8. 
Comp. P. anomala, Rve. Conch. Ic. pl. 3, sp. 9, = Neptunea 
anceps, H. & A. Ad. Gen. i. 80. 
Dr. Gould having sent a fine specimen of this shell with the 
operculum and animal dried, I requested Dr. Gray to examine 
them. His report is as follows :—“It has the elongated 
cylindrical proboscis of Cassidule and Muricide, and three 
series of teeth. The central tooth is arched, with three elon- 
gate acute processes infront. The lateral teeth versatile, with 
a larger apical and smaller hamate tooth at its base, the latter — 
' having a small hamate process on the outer side of its base. 
Plates of insertion in denticulated lobes ; integument tessel- 
lated with smooth scales. 
“Unfortunately the animal had been injured about the head, 
so that I could not observe the form of that part, or the position 
of the tentacles which is the essential character of the two 
families above named, and the teeth are not distinctive; but 
considering all the characters, I think that it has more affinities 
with Colus (Fusus) in Muricide, than with Pyrula in Cassi- 
dulide. The operculum is ovate subtrigonal ; apex rather 
worn; the size of the mouth of the shell.” 
The shell is characterized by its depressed Turbinelloid 
growth, angulated whirls, and swollen rounded ribs, crossed 
by spiral strie. Labrum crenated, lirated within. Labium 
conspicuous in the adult. Shell white, with a beautiful velvety 
olivaceous epidermis. Young shell with canal bent, and a 
callous Fasciolaroid fold on the columella. According to 
Brod. § Sow., a fossil from the Calcaire Grossiere of Paris 
presents no observable marks of difference. Long. 1°54, 
long. spir. °62, lat. °96, div. 70°. 
Hah.— Mazatlan, Belcher.— Callao, Peru, Hinds, B. M.— 
Mazatlan ; extremely rare; L’pool Col. 
Tablet 2412 contains the largest and the smallest specimens. 
640. Fusus TUMENS, 7. s. 
F. t. parva, spird acuta, marginibus rectis ; anfr. ii. nucleosis, 
y. normalibus, valde tuwmentibus, suturd impressa ; costis radi- 
antibus vi. valde tumentihus, rotundatis, ad basin obsoletis, 
