PLATE XIX. 



Page. 



Trigonarca obliqua Meek 92 



Pig. 1. Left valve of a short broad specimen, showing traces of radiating 

 lines on the posterior region. (See other figures on PI. xx.) 

 Nat. Mus. Cat. Invert. Foss., 22869. 



Trigonarca depressa White 93 



Fig. 2. Right valve of the type specimen. 



Nat. Mus. Cat. Invert. Foss., 8645. 



Modiola (Brachydontes) multilinigera Meek 86 



Fig. 3. Left valve (after White). 

 Pinna petrina White 88 



Fig. 4. Eight valve of the type of Pinna stevcnsonL (See PI. xx, Fig. 1.) 

 Nat. Mus. Cat. Invert. Foss., 8101. 



230 



