NOTES ON THE BRITISH JURASSIC BRACHIOPODA. 39 



TEREBRATULINA, d'Orbigny, 1847. 

 Efcjm. — Diminutive of Terehratula. 



The Terebratulinae may be distinguished from the Tere- 

 bratulse, to which they appear closely allied, by several well- 

 marked features. 



The shell may be described as generally longer than wide, 

 and more or less oval in shape ; the beak is obliquely trun- 

 cated by a foramen, which generally extends to the umbo ; 

 deltidium small, and at times indistinct, or entirely absent ; 

 sometimes the dorsal valve exhibits two variously developed 

 auricles or ear-shaped expansions. External surface of the 

 valves striated or costellated. Articulated like Terehratula. 

 Loop short, and rendered annular by the union of the 

 oral processes in the form of a band. Labial appendages, 

 which project considerably into the interior of the shell, 

 supported by the crura (8, p. 63) (20). Shell structure 

 punctated. 



Davidson recorded the following species as occurring in 

 the Jurassic rocks of this country : — 



T. radiata, Moore, Great Oolite, Hampton Cliff, near Bath. 



T. „ var. dundriensls, Dav., type from the Inferior 

 Oolite of Dundry. 



T. (?) deslongchampsii, Dav., Middle Lias, Whatley, near 

 Frome. 



T. (?) granulosa, Dav., Upper Lias, Ilminster. 



T. suhstriata, var, suffieldensls, has since been named by Mr. 

 Walker. It came from the Lower Coral rag of Suffield, near 

 Scarborough (20). 



Excluding T. (?) desloiigchamjpsii and granulosa, which are 

 doubtfully placed in TerebratuUna, the genus may be said to 

 have first made its appearance in the Oolitic seas. It has 

 persisted through the Cretaceous and Tertiary rocks, and 



