150 



University of California Publications in Geology 



[Vol. 8 



indicating the position of the sinus. The canal is broken, but the 

 upper portion suggests that it is a long one. 



Dimensions. — Width of body whorl, 13 mm. 



Occurrence. — University of California Locality 1540. 



Cephalopoda 



HERCOGLOSSA MEERIAMI, n. sp. 

 Plate 17, figures 5a, 5b 

 Shell medium in size, aperture wide ; ventral saddles large and 

 simple ; lateral lobes well rounded, becoming more acute toward the 

 posterior; lateral saddles well rounded but not so acute as the lateral 

 lobes. 



Dimensions. — Diameter about 90 mm. 



Occurrence. — Two specimens have been found at University of 

 California Locality 243, Trochocyathus zitteli zone, type locality of 

 the Martinez. 



This species differs from H. tuomei Clark and Martin and from 

 H. ulrichi (White) in its more acute lateral lobes and saddles. Its 

 aperture is narrower than that of H. ulrichi. In other respects it 

 resembles this last mentioned species closely. 



NAUTILUS STEPHENSONI, n. sp. 

 Plate 18, figures 2a, 2b 



Shell subglobose. Whorls increasing very rapidly in size. The 

 body whorl is large, convex, rounded on sides; the other whorls are 

 immersed in it. Umbilicus covered. Surface decorated by very fine 

 sinuous lines of growth. Septa slightly undulating; ventral lobe 

 slightly concave; the lateral lobe and lateral saddle gently curved. 

 The uniform rounding of the body whorl is a very pronounced feature 

 of this species. 



Dimensions. — Greatest diameter 32 mm. 



Occurrence. — University of California Locality 243. 



This species is decidedly more globose than the species described 

 by Gabb as Nautilus texanus(f) Shumard. 



Named in honor of the collector, Dr. L. W. Stephenson, Acting 

 Professor of Palaeontology, University of California. 



