fLA^TE XII. 



Fig. I. CuciiLi.^KA Hauui'.i.... 1:j4 



I. Side view, niaguificU. 



1 a. A lino showing the natural size of same. 



I 6. An ontline anterior view, to show tho convexity of the shell, natural size. 



Kig. 2. Lima (LiMATUl.iV) ERECTA. A si uglo valve, natural size i;iU 



Kig. 3. Myopitokia linkata ? i;i:5 



:S. A specimen with tho beak broken away, natural size. 



3 «. The same, magnified. 



Fig. -1. VOLSELI-A SCAI.PltUM, Vai\ ISONEM A VM 



4. Side view, natural size. 



4 «. An outline to show convexity. 

 Fig. ."•. An undetermined bivalve (internal oast). 



Fig. (i. MVACITES (Pl,i;Ul;uMYA) .SUIlCOMPliES.SA i:!G 



6. Side view. 



6 a. Au outline to show convexity. 



Fig. 7. BELEMNn'ES Nevadensis 1:J8 



7. Au imperfect specimen, with the lower extremity broken away. It also has a part 



of one side broken out, so as to show the cast of tho internal cavity for the recep- 

 tion of tho phragmocono. 



7 a. Is a section across Ihe upper end, showing the form of the upper part of tho iuterual 



cavity. 



7 6. An outline to show the compressed form of the guard near its lower end. 



Fig. 8. Phragmocono of apparently a large Belemuite i:i',( 



8 a. Auother view of snme, with a part of oue side removed, so us to show the deeply 



arcuate septa. 

 8 1). Auother fragment, showiug the marginal siphuucle. 



Fig. 'J. Pinna Kingii 1->1 



y. A side view of an imperfect cast, retaining portions of the shell. 

 da. Dorsal view of same. 



Fig. 10. Myacites iNCONSPicm:s. A siile view, magnilied two diameters i:!7 



Fig. 11. Myacites (Pi.euho.mya) Wedekensis 137 



II. Side view of a specimen with the posterior enil broken away. 



II a. Anterior view of same. 



Fig. 12. .Spiuikeuina pulchra 85 



12. A side view of a speciuuin, with the (;stremitie8 and beak broken away. 

 12 a. A cardinal view of same, showiug area and foramen. 



12 A. An anterior view of same. 



12 c. A dorsal view of another specimen, with impiiifoct extremities. 



12 d. A nearly complete ventral valve, as seen embedded in tho matrix. 



Fig. 13. AVICUI.OPECTEN OCCIBANEUS 'J(> 



13. A specimen of left valve, with the anterior ear broken away, natural size. 

 13(1. Auother specimen of loft valve, figure enlarged two diameters. 



13 1. Another specimen, .apparently of loft valve, with posterior ear more acute. 



