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SUPPLEMENT TO THE BRITISH 



67. Zellania obesa, Moore. Sup., PI. XI, fig. 22. 



Zellania obesa, Moore. Quarterly Journal Geol. Soc, vol. xxiii, p. 540, pi. xvi, 

 fig. 28, 1867. 



" Shell minute, transversely ovate, much inflated • margin rounded ; deltidium trian- 

 gular, widely gaping, and encroaching, as is usual with this genus, on both valves ; 

 surface smooth. Only one example of this shell has been found ; its very oval and inflated 

 character distinguishes it from the other three Liassic species 1 have described. But for 

 its very wide deltidium it might have been mistaken for a species of Entomostraca. 



Locality. — The Lower Lias of Stout's Hill." (Moore.) 



Genus Terebratella, D'Orbiyny. 



68. Terebratella Buckmani, Moore. Sup., PI. XIV, figs. 13, 14. 



Terebratella Buckmani, C. Moore. The Geologist, vol. iii, p. 441, pi. xiii, figs. 



1—5, 1860. 



Spec. Char. — Shell small, smooth, usually rather longer than wide, broadest about the 

 middle, rounded in front. Valves moderately convex, without fold or sinus; beak of 

 ventral valve slightly incurved, and truncated by a rather large foramen, laterally partly 

 margined by small deltidial plates. In the interior of dorsal valve the hinge-plate is 

 large and well defined ; the loop doubly attached, first to the hinge-plate and again to a 

 longitudinal septum, the principal pair of lamellae extending to some distance into the 

 interior of the shell before becoming deflected so as form the loop ; spinose projections are 

 also seen rising from the anterior portions of the deflected portion of the loop. Shell- 

 structure punctated. Dimensions variable ; length 8 ; width 2f lines. 



Obs. — Externally this small species is not easily distinguishable from similar sized 

 examples of Terebratula maxillata, with which it had been confounded until Mr. C. 

 Moore was able to show that its loop was doubly attached, and possessed all the internal 

 characters of true Terebratella. The loop seems also to have been subject to various 

 changes in its process of development. Terebratella Buckmani may, however, be often 

 distinguished from young T. maxillata by a dark longitudinal line extending from the 



