MAZATLAN UNIVALVES 503 



Var. = Fusus turbinelloides, Rve. Conch. Ic. pi. 15, sp. 56. 

 Fusus lignarius, + F. turbinelloides, + Neptunea pallida, H. fy A. 



Ad. Gen. i. 78, 79, 80. 



Comp, Pyrula lactea, Rve. Conch. Ic. pi. 3, sp. 8. 

 Comp. P. anomala, Rve. Conch. Ic. pi. 3, sp. 9, = JSTeptunea 



anceps, H. fy 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 Cassidulse and Muricidsc, and three 

 series of teeth. The central tooth is arched, with three elon- 

 gate acute processes in front. 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 Muricidse, than with Pyrula in Cassi- 

 dulidse. 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 stria?. 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 

 JSrod. fy 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. 

 Hob. Mazatlan, Belcher. Callao, Peru, Hinds, B. M.~ 



Mazatlan ; extremely rare ; IS pool Col. 



Tablet 2412 contains the largest and the smallest specimens. 



640. Fusus TUMENS, n. s. 



F. t. parvd, spir a acutd, marginibus rectis ; anfr. ii. nucleosis, 

 v. normalibus, valde tumentibus, suturd impressd ; costis radi- 

 antibus viii. valde tumentibus, rotundatis, ad basin obsoletis, 



