158 PAPERS, ETC. 



hitherto been considered tlie young of Terehratiäa maxillata, 

 but wliich I shall presently sliow is to be referred to 

 Terehratella. 



The Brachiopods obtained at Hampton consist of Terc- 

 bratula cardium, T, coarciata, T. digona, T. hemispherica, 

 T. maxillata, Rhynchonella concinna, R. obsoleta, Crania 

 antiquior. It will thus be seen that only tliree genera of 

 Brachiopods have hitherto been known in the Great Oollte, 

 and the bed under consideration. To these I have now to 

 add four other genera, viz., Terebral ella, Terebratulina, 

 Theeideum, and Zellania. 



Terebratula maxillata, Sow. 

 PL I., figs. 6, 7. 

 The adnlt form of this shell is found at Hampton, tliough 

 usually either in single valves, or in a crushed State. The 

 young ages of this shell are externally hardly distinguish- 

 able from the Terehratella Buchmann, described below. It 

 differs from the latter shell in its bcak being more truncated, 

 and the foramen more rounded ; it is also usually longer 

 than broad, a character it looses "when more adult. Intei'- 

 nally the generic difFerence is at once apparent, as this 

 shell possesses a short reflected loop, which in Terehratella 

 is doubly attached. 



Terebratula HEMiSPHiERiCA, Sow. 

 A pretty little shell, originally figured by Sowerby 

 under the name of Terebratula hemispharicay is not uncom- 

 mon at Hampton ClifFs. This was subsequently removed 

 by D'Orbigny from that genus, and placed with the Tere- 

 bratellaj ; and on the authority of the species to which I 

 now refer, that author carried the latter genus into the 

 oolites, in which he was followed, although with some 



