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



EXPLANATION OF PLATE 4 



Fig. la. Macrocallista (?) andersoni, new species, XL Type. 



Fig. lb. Macrocallista andersoni, new species, XL Umbone view of 

 species from Cal. Acad. Sci. Locality 183, Cowlitz phase, Washington. 



Fig. 2a. Tellina hovvardi, new species, XI. Type. 



Fig. 2b. Tellina howardi, new species, XL 



Fig. 3. Tellina californica Gabb, X2. 



Fig. 4. Semele diaboli, new species, XL Type. 



Fig. 5a. Corbula hornii Gabb, X2. This species is introduced for com- 

 parison with Corbula harrisi, new species, and Corbula uvasana, new 

 species. 



Fig. 5b. Corbula hornii Gabb, X2. Interior of same specimen figured 

 as Fig. 5a. 



Fig. 6. Corbula harrisi, new species, X2. Type. 



Fig. 7. Corbula uvasana, new species, X2. Type. 



Fig. 8. Corbula parilis Gabb, X2. View of specimen from Marysville 

 Buttes Tejon. 



Fig. 9. Neverita secta Gabb, XL From Cal. Acad. Sci. Locality 182. 



Fig. 10a. Neverita weaveri, new species, X2. Type. 



Fig. 10b. Neverita weaveri, new species, X3. Cotype showing young 

 form with small umbilicus. 



Fig. 11. Lunatia hornii Gabb, XL Specimen from Cal. Acad. Sci. 

 Locality 245. 



Fig. 12a. Lunatia cowlitzensis, new species, XL Type. 



Fig. 12b. Lunatia cowlitzensis, new species, XI. Cotype showing mouth 

 view of broad variety. 



