NOTES ON THE BRITISH JURASSIC BRAOHIOPODA. 33 



nnknown. A described dorsal valve of G. (?) davidsoui is 

 in the Bath Museum, 



KONINCKELLA, Munler-Chalmas, 1880. 

 Etjm. — Dedicated to L. G. F. de Koninck, naturalist. 



Munier-Chalmas' diagnosis of Kdninchella is very brief 

 indeed, as recorded by Davidson (10, p. 278). 



(Ehlert gives a much more exhaustive account, and de- 

 scribes the shell as " Concavo-convex, smooth, with the 

 valves very close together, cardinal line narrow, and the 

 general form of which recalls a Leptmiia ; cardinal process 

 subrectangular and prominent." Then follows a description 

 of the spiral appendages which, were furnished with thread- 

 like spines (16, p. 1292). 



The type species is the K. liasiana^ Bouchard sp., which 

 is found, with K. bouchardi, E. Desl., in the Middle Lias of 

 Ilminster. Only one other species is found in this country, 

 viz., K. rostrata, E. Desl., Middle Lias of Whatley, near 

 Frome, and Mungar, near Radstock. 



SPIRIFERINA, d'Orbigny, 1847. 

 Etym. — Diminutive of Spirifera. 



Formerly all the Spiriferin^e were placed in Sowerby's 

 genus Spirifera, but the presence of a median septum, and 

 an important difference in the shell structure of the Spiri- 

 ferinae, warranted their separation from the Spiriferse, to 

 which in external shape and ornamentation they are closely 

 allied. The shell structure in ^^pmjerma is punctated ; in 

 Spirifera it is not. 



The space intervening between the dental plates in the 

 interior of the ventral valve, in Spiriferina, was occupied by 

 the cardinal muscles, which were divided by an elevated 

 mesial septum, wide and thick at its base, but gradually 



D 



