PLATE III. 



Figure 1. Ventral valve of S, blainvillei page 28. 



" 2. Dorsal view of Strophomena punctulifera, page 30, 



3. Orthis aurelia, part of ventral valve (page 34). 



4. Orthis lucia, ventral valve (page 35), 

 " 4a. " " side view. 



Leptocoelia FLABELLITE3 (page 42). 



Figure 5. Ventral valve. 



" ba. Dorsal valve. 



" 56. Side view. 



" 6. Cast of interior of dorsal valve. 



" 6a. Cast of interior of ventral valve. 



Rensselaeria ovoides (page 41). 



Figure 7. Cast of interior of dorsal valve. 

 " la. " " " ventral valve 

 " 76. "■ " " rostral extremity. 

 " 10 & lOt/. Supposed to be a variety of R ovoides. 



Spikifera Gaspensis (page 44). 



Figure 8. Cast of interior of ventral valve. 

 " 8a. " " dorsal valve. 



" 86. " " " hicge line, &c. 



Athyris. 



Figure 9. Dorsal view, da, ventral, 96, side. This is supposed to be a. arcuata. 



MERISTA ARCUATA, Pal. N. Y., vol. 3. 



