THE BRACHIOPODA. 



1. TEREBRATULA PEROVALIS, Sowerby. 



TEHEBRATULA PEROVALIS, Davidson, Palaeontographical Soc., 

 plate x., figures 1-6. 



TEREBRATULA PEROVALIS, E. DesL, Brachiopodes Terr. Jurass., 

 plate li. (figs. 2-3) to plate Ivi. (figs. 1-2). 



This species is very distinct, especially in the adult state ; but 

 there has always been a tendency to put down for the young of 

 Terob. perovalis a largo number of easily separable species. 

 It is a groat pity to spoil a good and distinct species by crowding 

 it with too many forms. The young of the Tcrcb. perovalis have 



