PLATE XVIIL 



Veniella crassa (page 153.) 



Figure 1. Left valve of the type specimen, with the posterior extremity restored 

 in outline. 



L.EVICARDIUM SuciENSE (page 154.) 

 Figure 2. Right valve of the largest specimen collected. 



Clisocolus cordatus, Meek & Hayden, Sp. (page 157.) 



Figure 3. Left valve of a nearly perfect adult example. 



" 3 a. Portion of the interior of a left valve, showing the hinge plate, 

 " 3 b. View of the corresponding portion of the right valve. 



Opis Vancouverensis (page 158.) 



Figure 4. Exterior of a right valve of the only specimen known. 

 " 4 a. Interior of the same, showing the hinge teeth. 



Astarte Conradiana, Gabb (page 160.) 



Figure 5. View of a perfect example, with both valves. 



" 5 a. Interior of a detached left valve, showing the hinge teeth and part of 

 the crenulated basal margin. 



Astarte Conradiana, var. Tuscana (page 160.) 



Figure 6. Side view of a perfect specimen, showing only the left valve, for com- 

 parison with figure 6. 



Trigonia Tryoniana, Gabb (page 161.) 



Figure 7. A left valve. 



NucuLA PECTiNATA (?), Sowerby, var. (page 161.) 

 Figure 8. Distorted left valve of a shell supposed to be a variety of this species. 



YoLDiA STRIATULA, Forbes, Sp. (page 162.) 

 Figure 9. Left valve, enlarged, to show the surface markings more clearly. 



