Page. 

 Fig. 1. MoDIOMOIiPriA ? OVATA 103 



1. Eight valve ; tbe specimen being a cast of the outside. 

 la. A profile to show the convexity of same. 



Fig. 2. MoDiOMOEPHA? LATA. An external cast of a left valvc 103 



Fig. 3. DisciNA (undt. sp.) 98 



3. Under valve. 



3 a. Same, enlarged two diameters, and showing more nearly the proper proportions. 



Fig. 4. Spii^ra Whitneyi , 102 



4. A left valve of a small specimen. 



4 a. An outline to show the convexity of same. 

 4 &. A right valve of a larger specimen, 



4 c. A large individual apparently of the same species, 



Fig. 5. Halobia Lomivieli. A slab of rock, with several imperfect valves, all being casts of the 



exterior 100 



Fig. 6. Arcestes Gabbi „.. , 121 



(). A cast of the interior, side view. 

 6 a. Profile view of same. 



6 i. An outline showing the lobes and sinuses of one of the septa from the umbilicus to 



the siphonal lobe ; taken from Mr. Gabb's figure in the California Geological 

 Report. 



Fig. 7. Clidonites l^^vidorsatus 109 



7. A side view of the largest specimen in the collection. 



7 a. Profile of a smaller specimen of same. 



Fig. 8. EuTOMOCERAS Laubei 126 



8. A side view of an imperfect specimen, 



8 a. Profile of the same. 



Fig. 9. Gymnotoceras rotelliforme Ill 



9. Side view of an incomplete specimen, 



9 a. Profile of same. 



Fig. 10. Gymnotoceras Blakei 113 



10 Side view of an incomplete specimen, 

 10 a. Profile of same. 



10 6. A smaller specimen. 



10 c. An outline of the lobes and sinuses, taken mainly from Mr. Gabb's figure in the 

 California Geological Report. 



Fig. 11. Orthoceras Blakei ? Merely fragments of a cast, showing none of the septa 104 



