﻿JURASSIC AND TRIASSIC BRACHIOPODA. 



113 



05. Zellania globata, Moore. Sup., PI. XI, figs. 25 to 27. 



Zellania globata, Moore. The Geologist, vol. iii, p. 444, pi. xiii, figs. 15 — 17, 



I860. 



Shell minute, generally slightly wider than long (sometimes the reverse) globose ; 

 valves moderately convex, with a small depression near the front in the dorsal valve ; 

 beak small, area narrow, flat, with a somewhat triangular foramen ; surface smooth. 

 About half a line or less in length and breadth. 



Obs. — I have seen ten specimens of this very minute shell. It was not very correctly 

 drawn in ' The Geologist,' being much less circular than there represented, and the 

 depression in the dorsal valve not so great. No specimens showing the interior of the 

 dorsal valve seem to have been hitherto discovered ; but in the interior of the ventral 

 valve there exists a very peculiar and well-defined ridge, which encircles the inner 

 portion of the shell at a short distance from the margin. No trace of septa are visible 

 in the ventral valve. Z. globata was found by Mr. Moore in the Great Oolite of 

 Hampton Cliff, Bath ; in the Puller's Earth, Bath, and in the Coral Rag of Lyneham 

 (Wilts). 



6G. Zellania oolitica, Moore. Sup., PI. XI, figs. 28. 



Zellania oolitica, Moore. The Geologist, vol. iii, p. 444, pi. xiii, figs. 18 — 20, 1860. 



Shell very minute, triangular, longer than wide, broadest and rounded anteriorly, 

 tapering posteriorly ; valves moderately convex, most so near the beak and umbo ; surface 

 smooth. Length about the third of a line. 



05s. — Mr. Moore informs me that the punctations under the microscope are widely 

 separate. The incurvation of the umbo in the dorsal valve seems to be much greater in 

 some examples than in others. I have not seen any good interior, or indication of the 

 presence of a septum in either valve. Mr. Moore states, in his description of this shell, 

 that it is found with the Z. Davidsoni and Z. Laboucherei in the Inferior Oolite of 

 Dundry. That it is a thicker and more triangular shell than the former, and devoid 

 of the striae noticed in that shell. He adds that it is to be distinguished from 

 Z. Laboucherei by its triangular and less symmetrical form, and wants the concentric 

 lines on the valves, characteristic of that species. The shell-structure is distinctly punc- 

 tate, as it is in all the species of the genus. I have seen eight examples from Dundry. 



15 



