PLATE XXX. 



MoNOTRYPELLA Unjiga (page 214). 



Figure 1. Terminal branchlet, natural size, 



Figure la. Portion of the same, four times the natural size. 



Figure V>. Transverse section of a terminal branchlet, x 30. 



Figure Ic. Longitudinal " " " " 



Figure l(i Tangential " " " " 



Pentamerus galeatus (page 234). 

 Figure 2. Dorsal view of the specimen referred to in the text. 



NeWBEERIA LyEVIS (pago 237). 



Figure 3. Cast of the interior of the closed valves of a specimen of this 



species, shewing the characters of the dorsal valve. 

 Figure 4. Dorsal view of a specimen with the test preserved. 

 Figure 4a. Profile of the same, in outline. 



ScHizoDus Chemunuensis (page 241). 



Figure 5. Side view of the specimen referred to in the text. 

 Figure 5a. Outline of the same, as seen from above- 



