396 Mr. S. S. Buckman on Jurassic Brachiopoda. 



Bemarhs. — As Eudes-Des]ongcliamps''s forms of T. sartlia- 

 censis do not agree with the figure cited by d^Orbigny it is 

 necessary to rename. It seems to me that Deslongchamps 

 has included species of more than one genus in his T. sartha- 

 censis^ like as are his figures 3 and 4. But his fig. 3 is a 

 well-marked form showing, as he himself remarks, affinity 

 to T. Eugenii : so I give a name to this form and suggest 

 that it is the ancestor of T. Eucjenu, which is the type of 

 the genus Epicyrta. The incipient sulcation of the ventral 

 valve might easily pass by tachygenesis into the complete 

 sulcation characteristic of Epicyrta Eugenii. Deslongchamps's 

 fig. 4 appears to be more allied to the indentata series ; and 

 it is not easy to imagine how fig. 4 could pass into E. Eugenii j 

 it seems to be too far developed in another direction. 



14. Ornithella ornithocephala (J. Sowerby). 



T.d. 1815. Min. Conch, vol. i. p. 227 (pars). 



Tff. Ibid. pi. ci. fig. 1, vhicli refers to the left-hand top figure only. 

 Type refigured, Davidson, Brit. Jur. Brach., Suppl. pi. xxii. 

 fig.l. 

 T.l. Chatley [Somerset, nr. Frome]. 

 S. Cornbraeh [Bathonian]. 

 CvlL Sowerby [British Museum]. 



Remarks. — I have examined the three specimens in the 

 British Museum marked as Sowtrb} 's types and numbered 

 43,433. Fig. 1, depicted in the N.W. corner of Sowerby's 

 plate, must be taken as the type of Terebratula ornithocephala. 

 The specimen marked " fig. 2," which denotes the example 

 depicted in two positions in the S.W. and N.E. portions of 

 the plate, is a different shell. I feel doubtful if it is the figured 

 example. It is of a daik blue colour : it may be Cornbrash; 

 but it is negligible. Fig. 4 is type of T. sarthacensis, q. v. 



Now the point is this : the fig. 1 of Sowerby's plate is 

 not the same species as the Fullers' Earth fossil which has 

 so long borne the appellation of Terehratula (or Waldheimia) 

 ornithocephala ; it differs particularly in its beak, and it is a 

 broader shell. 



Here it maybe remarked that d'Orbigny in his ' Prodrome/ i. 

 p. 316, applied the name suhtriquetra to Sowerby's 1\ tri- 

 quetral as this term was already occupied by Parkinson, 

 Sowerby's shell has been regarded as a variety of the Fullers' 

 Earth T. ornithocephala, but as that is a mistaken identi- 

 fication the name Ornithella suhtriquetra (d'Orbigny) will 

 take priority. However, on these Fullers'* Eartli species 

 I hope to say something further at another opportunity. 



