PLATE 103 A. 



Page 



Fig. 1-6. Ehynciionella speciosa. 444 



1 a. Dorsal view of a specimen of medium size. 



1 6. Profile of the same, showing some parasitic bodies attached at the front and side. 



2 o. Dorsal view of a larger individual. 



2 6 & c. Profile and front views of the same. 



2 d. Cardinal view, showing the deep sinuosities in the dorsal valve and the auricular exten- 

 sions of the ventral valve. 



3. A partial cast of a large individual of this species. 



4 a. The ventral valve, showing the muscular impression : the teeth are broken ofi". 



4 6. A fragment of a dorsal valve, showing the muscular impression, teeth, etc. 



4 c. Cardinal view of the preceding specimen. 



5. The rostral portion of a specimen, showing the junction of the valves, the median septum 

 in the dorsal valve, and the crural processes of the ventral valve. 



6 a. The interior of the dorsal valve, showing the median septum, the crural processes, the 

 thickened cardinal process with the prominent bilobed summit, and the dental fossets. 



6 b. Cardinal view of the preceding specimen , showing the sinuosities on each side of the beak, 

 the cardinal and crural processes. 



