JURASSIC AND TRIASSIC BRACHIOPODA. 155 



fig. 1). This shell appears to be exceedingly rare, as no other example of the species is 

 recorded from the locality. On his return to Boulogne Mr. E. Rigaux kindly sent me the 

 fragmentary specimen above mentioned, with others of T. Boloniensis from Boulogne-sur- 

 Mer, observing at the same time that he believed the Bullingdon fossil to be referable to 

 the same species. Another perfect British example of this species, from the Coral- rag 

 of Malton in Yorkshire (Sup., PL XIX, fig. 2), was found by Mr. Walker in the Leckenby 

 collection in the Woodwardian Museum, Cambridge. Ter. Boloniensis is also an 

 uncommon fossil in the Middle Portlandian beds of the Boulonnais. It has been found 

 at the Tower Croi, Alprech. Mr. E. Rigaux informs me that he only obtained seven 

 specimens in eighteen years, and M. de Loriol also knows of but very few examples. 

 We are not acquainted with any British species of Terebratula in the Portland series ; and 

 indeed no Brachiopod is known to me from that formation, except an uncertain fragment 

 of a Bhynchonella which Mr. James Parker believed was obtained from the Portland of 

 the upper portion of Shotover Hill, Oxford. Mr. Parker also mentions that he found 

 a Terebratula (Sup., PI. XIX, fig. 3), bearing much resemblance to T. Boloniensis, in the 

 Oxford Clay of St. Clements, Oxford. 



130. Terebratula Gesneri, Etalon. Dav., Sup. PI. XIX, figs. 4, 5. 



Terebratula Gesneri, JEtalon. Lethsea Bruntrutana, p. 287, pi. xli, fig. 10, 1861. 



Shell elongated oval, longer than wide, rounded in front. Ventral valve convex and 

 deeper than the opposite one ; beak moderately produced, incurved, and truncated by a 

 circular foramen, slightly separated from the hinge-line by a deltidium in two pieces ; 

 beak-ridges sharply defined, with a flattened space between them and the hinge-line. 

 Dorsal valve evenly convex without fold. Surface smooth, marked at intervals with 

 concentric lines of growth. Length 13, width \0\, depth 7\ lines. 



Obs. — With some uncertainty this species is referred to T. Gesneri of Etalon. Mr. 

 James Parker obtained three examples of different ages from the Coral-rag of Bullingdon 

 and Horsepath pits, close to Shotover Hill, Oxford, and there is a fragment of the same 

 species from the last-named locality in the Oxford Museum. The shell is smaller than 

 T. Boloniensis, and is more elongated and oval. The dorsal valve is also more convex. 

 It resembles, as far as I can judge from the figures of Etalon's T. Gesneri, which, 

 according to that geologist, occurs in the Astartian zone of his Portlandian at Bure and 

 Blauen in the Bernese Jura, where it is said also to be rare. This species seems to be 

 nearly allied to T. insignis. 



