Echinoidea, Brachiopoda, and Lamellibranchia. 



17 



PECTEN (NEITHEA), sp. 



An imperfect specimen which appears to be part of a left valve of 

 Neithea is present in the collection. 



PEENA, sp. 

 Text-figures 4-6. 



There are twelve internal casts of a large sub-quadrate Perna. 

 In some cases portions of the shell are preserved and show a 

 prismatic structure similar to that seen in P. Ricordeana, d'Orb. 







FIG. 5. Perna, sp. Internal cast. Left valve and anterior view of both valves. 

 The posterior and the ventral margins are imperfect, x |. 



The largest specimen has a height of about 150 mm., and its hinge- 

 line is about 85 mm. long. One example shows the cast of the 

 ligament area and grooves. This species resembles P. valida 

 (Stoliczka) * from the Ariyalur Group (Senonian) of Southern India, 



* Cret. Fauna S. India, vol. iii. (1871), p. 409, pi. xxii., fig. 1. 



2 



