Page. 

 Fi^. 1. MoDIOMORPIIA ? OVATA 10:{ 



1. KiKlit valve ; tbo specimen being a cast of tlic outside. 

 1 «. A proUlc tosliow tbo convexity of same. 



Fig. 2. MoniOMOliPllA ? lata. An cxtcrual cast of a left valve 103 



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



3. Under valve. 



,ia. Same, enlarged two diameters, and sbowing more nearly tbo proper proportions. 



Fig. 4. Srii.EUA WiiiTNEYi 102 



4. A left valve of a small specimen. 



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



4 6. A right valve of a larger specimen. 



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



Fig..''). IIai.ouia Lom.meli. A slab of rock, with several imperfect valves, all being casts of the 



CNterior 100 



I'ig. (i. Ai:ci;srE."( GAnni '121 



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

 Cta. Profile view of same. 



(I 6. 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. C'l.IDONITE.S l.^KVIDOI!.SA'rUS 109 



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

 7 a. Profile of a smaller specimen of same. 



Fig. 8. EUTO.MOCKKAS Laubei 12(> 



8. A side view of an imperfect specimen. 

 H a. Profile of the same. 



Fig. 'J. GVMNOTOCBIiAS UOTELLIFORMK Ill 



'J. Side view of an incomplete specimen, 

 y o. Profile of same. 



Fig. 10. Gymnotoceras Bi,aki;i 11:5 



10 .Side view of an incomplete specimen. 

 10 a. Profile of same. 

 10 b. A smaller specimen. 



10 c. Au outline of the lohes and sinuses, taken mainly from Mr. (i.ibb's figure in the 

 California Geological Report. 



Fig. 11. OitriiocERAs Jti.AKKi? Merely fragments of a cast, sbowing none of the septa 104 



