PLATE 102. 



Page 



Fig. 1 & 2. Ehtnohonella oblata. 439 



1. A young individual, retaining a part of the shell on the dorsal valve. 

 2 a. Front view, showing the broad shallow sinus. 



2 b. The ventral side of another specimen, showing the muscular area and the ramifying 

 vascular impressions. ( The latter are represented in lines too sharply defined : the two 

 sides are not connected by a sharp line, as shown in the figure; and their extension to- 

 wards the front of the shell is in shallow depressions, which gradually become obsolete.) 



2 c & d. Dorsal and cardinal views of the same specimen. 



Fig. 3. Khynchoneli-a multistriata. 440 



3. View of the dorsal valve. 



Fig. 3 a, b, c; 4 a, b, c. Rhynchonella pleiopleura. 440 



8 a. A ventral view of a cast. The area of the muscular impression is not sufficiently defined. 



3 6. Dorsal view of the same specimen, showing a greater convexity of the valve, and a 

 shorter medio-longitudinal septum than the R. oblata, 



3 c. Front view of the same. 



4 o. A larger individual. The specimen is somewhat broken and distorted. 

 4 6 & c. Dorsal and profile views of the same. 



