92 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



EXPLANATION OF PLATE 8 



Fig. la. Siphonalia bicarinata, new species, X2. Type. 



Fig. lb. Siphonalia bicarinata, new species, X2. Aperture view of type. 



Fig. Ic. Siphonalia bicarinata, new species, X2. Back view of young 

 individual, a cotype. 



Fig. Id. Siphonalia bicarinata, new species, X2. Aperture view of speci- 

 men figured at Fig. Ic. 



Fig. 2a. Hemifusus sopenahensis Weaver, XI. Cotype. 



Fig. 2b. Hemifusus sopenahensis Weaver, XI. Cotype. This specimen, 

 a young individual, suggests the genus Nystilochns decidedly. It differs in 

 certain details of form from mature specimens. 



Fig. 3a. Molopophorus tejonensis, new species, X2. Aperture view of 



type. 



Fig. 3b. Molopophorus tejonensis, new species, X2. Back view of type. 



Fig. 4a. Hemifusus volutaeformis, new species, X2. Aperture view of 

 type- 

 Fig. 4b. Hemifusus volutaeformis, new species, X2. Back view of type. 



Fig. 5a. Urosalpinx tejonensis (Weaver), X2. Cotype from Cal. Acad. 

 Sci. Locality 182. This was described by Weaver as Hemifustis tejonensis 

 but better material shows it to belong in the genus Urosalpinx. 



Fig. 5b. Urosalpinx tejonensis (Weaver), X2. Aperture view of cotype. 



Fig. 5c. Urosalpinx tejonensis (Weaver), X2. Aperture view of a 

 short variety. 



Fig. 5d. Urosalpinx tejonensis (Weaver), X2. Back view of specimen 

 figured as 5c. 



Fig. 6a. Amphissa eocenica (Weaver), X2. Cotype. . 



Fig. 6b. Amphissa eocenica (Weaver), X2. 



Fig. 6c. Amphissa eocenica (Weaver), X2. Cotype illustrating change 

 in proportions in older individuals. 



Fig. 7. Molopophorus striata Gabb, X3. 



