﻿JURASSIC AND TRIASSTC BRACHIOPODA. 115 



extremity of the umbo of the dorsal valve to nearly the centre of the valve, which denotes 

 the presence of an internal median septum. 



Position and Locality. — Terebratella Buckmani occurs in the Great Oolite of Hampton 

 Cliff, near Bath, where it is rather abundant. 



69. Terebratella furcata, Sow., sp. Sup., PI. XIV, figs. 15, 16. 



Terebratula furcata, Sow. Min. Conch., vol. vi, tab. 535, fig. 2, 1826. 

 Terebratella — C. Moore. Geol. Mag., vol. iii, p. 442, pi. xiii, figs. 8 — 10, 



1860. 



Spec. Char. — Shell very small, slightly longer than wide, sides and front rounded, 

 tapering at the beak, which is truncated by a circular foramen, partly margined by small 

 deltidial plates ; valves regularly and moderately convex, without fold or sinus, and 

 ornamented with from ten to seventeen small, angular ribs, of which a few are due 

 to bifurcations and intercalations at various distances from the beaks. Shell-structure 

 punctated. In the interior of dorsal valve the hinge-plate is large, while the loop is 

 doubly attached to the hinge-plate and mesial septum. Dimensions variable ; length 2-| ; 

 breadth 2 lines. 



Obs. — This shell has generally been confounded with the young of Waldheimia 

 cardinal, to which it externally bears much resemblance ; it was only after Mr. C. Moore had 

 discovered its loop to be that of a Terebratella that the distinction could be established. 

 Indeed, in shape and character its loop entirely agrees with that of Terebratella Buckmani, 

 as may be seen by a glance at the figures of the interior of both species. Sowerby in 

 1826, without having seen its interior, described it as distinct from Wald. cardium (his 

 Terebratula orbicularis). He mentions that, when old, the plaits are forked and the sides 

 rounded. 



Position and Locality. — T. furcata occurs in the Great Oolite of Hampton Down, 

 near Bath. Perhaps PI. XII, fig. 17, of my Monograph may belong to the species under 

 description. 



70. Terebratella Moorei, Dav. Sup., PI. XIV, fig. 17. 



A single broken dorsal valve, of a very small finely striated Terebratella, differing 

 in several respects from T. furcata, was found in the Great Oolite of Hampton Cliff, 

 Bath, by Mr. C. Moore, in whose collection the specimen is preserved. I have 

 considered it desirable to give the shell a distinctive name, although I am not able to give 



