CRETACEOUS FOSSILS.' 147 



Length, 1.7 inch ; width, 1. inch ; length of aperture, 1.2 inch. 



The only specimen I have seen is from Martinez, from the Tejon Group, or from 

 the beds intermediate between that and the Martinez Group, west of the town. It 

 is so weathered that the sculpture, if any, is obliterated. The only shell with 

 which this could be confounded, even in casts, is Fasciolaria Iceviuscula, and from 

 that it can be readily distinguished by its more gibbous form and curved canal. 



N. MUCRONATA, 11. 8. 

 PI. 26, Fig. 25. 



Shell moderate in size, thin, rounded fusiform; spire elevated, 

 acute; whorls seven, rounded; suture sharply defined, linear; 

 body whorl regularly convex, swollen in the middle, excavated 

 in advance. Aperture large, acute behind, continued into a 

 (slightly curved?) canal in advance; outer lip simple, thin; inner 

 lip slightly incrusted; canal (from lines of growth) moderately 

 produced and a little deflected. Surface marked by a few faint 

 strise of growth, and by regular, small, revolving impressed lines. 



Length, 1.1 inch ; width of body whorl, .6 inch; length of aperture, .65 inch. 

 Not common in the Martinez Group, at Martinez ; Mathevvson. The shell re- 

 sembles somewhat Fusus Californicus, but can be distinguished by its more slender 

 acuminate spire, the entire absence of longitudinal ornament, thinner shell, moro 

 convex form, the curved canal, and by the details of sculpture. F. Californicus 

 has not, as yet, been found at so low a horizon, stratigraphically, as the present 

 species. 



PAL^EATRACTUS, N. Gen. 



I propose this name for a group of Fusoids of more or les3 

 pyriform shape, with a low spire, thick shell, slightly twisted 

 columella, simple outer lip, inner lip incrusted, and with a heavily 

 ribbed or cancellate surface. They cannot with propriety be 

 placed in any of the heretofore described genera of Fusince; 

 Neptunea has a more or l^ss elevated spire, and its sub-genus, 

 Tritonofusus, with a low spire, is very thin, and the surface smooth, 

 or marked only by fine lines; Cantharus has the outer lip crenu- 



