PLATE 106. 



Fig. la-/. Leptoccema flabellites. 449 



1 a,b, c,d. Dorsal, ventral, and profile view of this species. ( The figures, unfortunately, 



represent too many plications by two on each side of the centre.) 

 1 e. The interior of the dorsal valve, showing the cardinal process, etc.  



If. A cast or impression of a larger dorsal valve. 



Fig. 2 a - 1. Rens8EL.«;ria ovalis. 458 



2 a. The ventral valve of a specimen, which partially preserves the shell on the upper part. 

 2 6. Another specimen from which the shell is partially removed. 

 2 c. Profile of the same, showing the inflected margins of the shell. The specimen Las been 



flattened by pressure. 

 2 d. Ventral view of a well-preserved cast of this species. 

 2 e. Dorsal view of the same, showing the muscular impression, imprints of the hinge-plates, 



and the dental plates preserved in the cast of the rostral cavity of the opposite valve. 



2/. Profile view of the preceding specimen. 



2 g. The upper portion of the preceding specimen enlarged. The indentations on the hinge- 

 line are due to marks sometimes shown on the valves of old specimens of some or all the 

 species of this genus. 



2 ft. The cast of a smaller specimen, showing the muscular area and the marks of the ad- 

 ductor muscles. 



2 i, k, I. Dorsal and ventral views of imperfect casts of this species. 



