40 NOTES ON THE BRITISH JURASSIC BRACHIOPODA. 



is represented at the present time by eight species and six 

 uncertain species. 



Whether or not the promotion made by Fischer and CEhlert 

 of the recent T. wyvillei, Dav. sp. as the type of their new 

 family Dyscoliidte, will carry with it other recent Terebratu- 

 linae, or otherwise interfere with the present arrangement 

 of our Jurassic species I am not prepared to say (6). 



DISCULINA, Eug. Deslongchamps, 1884. 

 Etym, — Diminutive of disculus, a little disk. 



Deslongchamps' description of Disculina is as follows : — 

 " Shell quite discoidal ; ventral valve regularly convex ; 

 dorsal valve absolutely flat, nearly in the form of an oper- 

 culum. Surface ornamented with fine striae, regularly and 

 very equally disposed in a radial series. Large valve fur- 

 nished with a well pronounced area, in the centre of which 

 is perforated a broad, rounded foramen, completed below by 

 two little lateral deltidial plates, which do not unite together 

 on the median line. Interior presenting an identical 

 appearance in the form of the plateau and of the cardinal 

 region to that of Terebratulma. Brachial apparatus un- 

 known." (12, p. 241). 



Disculina is represented in this country by one species 

 only (the type), the very rare and handsome D. hemisphcerica, 

 Sow. sp., which may be occasionally met with in the Great 

 Oolite of Hampton Cliff, Kingsdown, and Farley, near 

 Bath. 



Davidson included this species first in Terehratella, and 

 afterwards in Terebratula. 



