248 NOTES ON THE BEITISH JURASSIC BRACHIOPODA. 



Z. witchelli, S. Buckman, Inferior Oolite, Notgrove Station, 

 Glos. 



Z. strangwaysi, Walker and Buckman, Dogger of Peak, 

 Yorkshire coast. 



Z. vicinalis, Quenst., Lower Lias, Radstock, has been 

 identified by Mr. Walker (2, p. 18). 



Aul. hernardina, Oppel, has been identified bj Mr. Walker 

 from the Oxford Clay of Huntingdonshire. (York. Phil. 

 Soc. Report for 1884.) 



The type specimen of Z. suhnumismalis, Dav., and a de- 

 scribed specimen of Z. quadrijida, Sow., both from the 

 middle Lias of Ilminster, are located in the Bath Maseum 

 (23). 



Described specimens of Z. a7iglica, Oppel, are in onr 

 Museum (22). 



TEHEBRATELLA, D'Orbigny, 1847. 



Etym. — Diminutive of Terehratula. 



Davidson describes the shell of Terehratella as elono-ated 

 or transverse, and variable in shape : both valves regularly 

 and unequally convex or interrupted by a longitudinal 

 depression in the smaller valve. Beak truncated by an 

 oblique foramen of a circular or oval form, and partly 

 margined by a deltidium in two pieces, at times disunited 

 above the umbo : beak-ridges more or less well-defined, and 

 in some cases bearing between them and the hinge-line a 

 flat or concave cardinal area. Valves articulated : external 

 surface smooth or variously punctated. In the interior of 

 the dorsal valve, under the cardinal process and hinge-plate, 

 is developed a more or less elevated medio-longitudinal crest 

 or septum which extends to about half the length of the valve. 

 The loop is elongated and doubly attached, first to the hinge- 

 plate, and afterwards to the mesial septum, by processes 



