﻿100 ME. S. S. BUCKMAN ON CERTAIN JURASSIC [Feb. I9IO, 



Terebratula-buckmani series which is commencing triplication,, 

 and has proceeded very little with it. Its more equivalve shape 

 and want of projection of the fold separate it from T. burtonensis. 



Localit3 T , etc. — The Irony Bed of Louse Hill (near Sherborne r 

 Dorset), and of other quarries around, has produced this species in 

 some abundance. It is of blagdeni date (Bajocian). 



Terebratula stibara, 1 sp. nov. (PI. XII, figs. 5 & 6.) 



Description. — A tumid, biplicate Terebratulid, with well-deve- 

 loped folds. Yentral valve rather more gibbous than dorsal. Lateral 

 margin a good deal curved; anterior margin of a well-developed M 

 shape. Folds and furrows reaching about half way up the valve r 

 except the median ventral fold, which is more or less a continuous 

 carina up to the beak. Beak short, stout, hardly overhanging the 

 umbo, obliquely truncated by a medium-sized foramen. 



Distinction. — T.stephani, Davidson, of which the type is figured • 

 in Proc. Dorset Nat. Hist. & Ant. F.-C. vol. i, pi. i, fig. 3 (1877), 

 is a thinner, longer, and more biplicate shell, showing none of the 

 tumid habit of this species. 



Remarks. — This species is evidently a tumid development of the 

 T.stephani series, though hardly of that species itself. Its 4 fatness T 

 and rotundity make it a very distinct form. 



Locality, etc. — Crewkerne Station (Somerset), Broad Windsor 

 and Burton Bradstock (Dorset), have yielded various specimens in 

 Mr. J. W. D. Marshall's collection and my own. They come from the 

 * top beds of the Inferior Oolite ' ; and have not been more accurately 

 dated, for want of subdivisional names for these beds. The species 

 is of about scliloenbachi date, perhaps zigzag, perhaps both. 



Terebratula vinneyensis, 2 J. F. Walker, MS. (PI. XII, figs. 7 & 8.) 



Terebratula spharoidalis, auctt. (pars). 



Description. — A small, flattened, spheroidal Terebratulid with 

 uniplication, the margin curved to form an inconspicuous though 

 broad, dorsally projected, flattened fold. Beak somewhat large \ 

 foramen small ; deltidial plates hidden. 



Distinction. — T. splicer oidalis, J. de C. Sowerby, though so 

 often quoted, is a species about which very little is known ; and the 

 specimens called by that name seldom agree with his figure. That 

 species differs from the form now described by being more spheroidal, 

 having ' the edges of its valves even ' (Sowerby), a more dumpy 

 beak, and valves not so flattened anteriorly (tapering, side view). 

 T. siibsphceroidalis, Upton, 3 is more in character with the present 

 species, but that is more globose and has a small n fold : the fold 

 of Walker's species may be described as a flattened tc fold. 



Remarks. — The late Mr. J. F. Walker separated this form some 



1 GTiflapSs, stout. 



2 Vinney Cross is the native name of what is called Vetuey Cross, about 

 2 miles east of Bridport (Do.-set). 



3 Proc. Cotteswold Nat. Hist. F -C. vol. xiii (1899) p. 124 & pi. iii, figs. 5-7. 



