CRETACEOUS FOSSILS. 151 



above, the upper volutions undulated or minutely nodose on the 

 angle ; suture channelled. Aperture moderately wide, biangular 

 posteriorly, outer lip deeply notched above the angle, prominently 

 rounded in the middle. Surface marked by lines of growth, and 

 by a few faint revolving lines anteriorly. 



Length, 1.9 inch ; width, .9 inch ; length of aperture, 1.2 inch. 



From the Tejon Group, Tejon; at Canada de las Uvas and Arroyo de los Alisos. 



The species was originally described from a singlo broken specimen, which 

 since proves to have been immature. It showed none of the characteristic por- 

 tion of the lower part of the mouth, and while I noted the peculiar curve in the 

 outline of the body whorl, 1 was misled into believing it to be a Cone. Having 

 since obtained better specimens, I am fortunately able to refer it to its proper 

 genus. It belongs to a group in the genus that has been indicated by Mr. Conrad, 

 under the sub-generic name of Surculltes, and which is characterized by the angu- 

 lated form of the present species. Mr. Conrad's type is an Eocene fossil. 



S. (SURCULITES) INCONSPICUA, D. S. 

 PI. 26, Fig. 29. 



Shell small, spire high; whorls six (?), angulated, concave 

 above and on the side ; body whorl broad, rapidly tapering in 

 advance. Surface marked by two large revolving ribs, one on 

 the angle and one a little in advance; between these, and on the 

 upper part of the whorl, the surface is covered with minute re- 

 volving lines; below the lower of the two ribs, the remainder of 

 the shell is marked by small revolving ribs. Aperture broad, 

 biangular posteriorly; outer lip notched above, produced below; 

 inner lip slightly incrusted ; canal moderate. 



Length of fragment, .47 inch; total length of shell, about .55 inch; width of 

 body whorl, .3 inch ; length of aperture, .25 — .28? inch. 

 From the Martinez Group, Martinez. Rare; Mathewson. 



HETEROTERMA, N. Gen. 



Shell short, robust-fusiform, spire low, body whorl dilated, 

 canal moderately long, straight; outer lip broadly notched or 

 emarginatc near the suture ; columellar lip incrusted. 



