FOSSILS OF THE SCARBOROUGH CORNBRASH. 59 



ANNUL AT A. 



Serpula intestinalis, P. 



squamosa, P. 



claw, B. 



CONCHIFERA. 



Order I. — Dimyaria. 

 Pholadomya Murchisoni, P. 

 ovalis, S. 



-acuticostata, S. 

 -obsoleta, P. 

 -simplex, P. 

 -nana, P. 



My a modica, B. 



literata, P. 



depressa, S. 



calceiformis, P. 



Amphidesma decurtatum, P. 



securiforme, P. 



decussatum, B. (New Sp.) 



Shell oval-oblong, equivalve, unequilateral, gaping, and a little round- 

 ed at each extremity, covered with numerous lines of growth, and 

 the anterior end finely striated longitudinally. Length 2 in., breadth 

 3£in. 



This rare shell is evidently of the same family as the above ; 

 probably none of them belong to the genus Amphidesma. 



Amphidesma recurvum, P. 



Corbula depressa, P. 



Sanguinolaria undulata, S. 



parvula, B. (New Sp. fig. 18). 



Shell transversely oblong, compressed, smooth, and 

 marked with a few lines of growth. Anterior end 

 a little rounded, and the posterior with a rounded 

 truncation. Beaks nearest the anterior extremity. 

 Length ^ in., breadth, \ in. 



A rare shell, which has not yet been found in any of our 

 other strata. 



Psammobia laevigata, P. 

 Tellina 



proletaria, B. Very rare. 



C orb is ovalis, P. 



lucida, B. 



Lucina crassa, S. 



despecta, P. 



Astarte minima, P. 



. lurida, S. 



-externa, P. 



-politula, B. 

 -rotundata, B. 



Pullastra percgrina, B. Unio peregrinus, P. 



large species, imperfect. 



Trigonia costata, S. 



< elongata, S. 



clavellata, S. 



