224 SUPPLEMENT TO THE BRITISH 



236. Rhynchonella jurensis, Quenstedt. Sup., PI. XXVII, figs. 24 to 27. 



Terebratula jurensis, Quenstedt. Die Jura, p. 287, tab. xli, figs. 33, 34, 35, 1858. 



Professor R. Tate in his paper on new Secondary Brachiopoda published in the 

 ' Geol. Mag.' for December, 1869, quotes this species from the Zone of Am. opalinus 

 (Upper Lias) of Great Britain, but does not give the locality. He states that " Mr. 

 Lycett ('Proc. Cotts. Club,' vol. ii, p. 142, 1860) records the above species from the 

 upper zone of the Supra-Liassic Sands." I have seen the specimen in the Lycett 

 collection purchased by the School of Mines of London, and have no hesitation in stating 

 that it is referable to Rh. rimosa of Von Buch. But now comes the question, What is 

 Mh. jurensis ? If we refer to pi. xli of 'Die Jura,' we find that Professor Quenstedt 

 gives figures of his so-termed species, which are apparently referable to at least two, if not 

 three, distinct shells. Taking the first-named figure (33) as the type, we have a small 

 subpentagonal shell, five lines in length by six in breadth, and three and a half in depth ; 

 the valves are almost equally convex or deep ; the surface of each valve is ornamented 

 with about twelve strong, simple, radiating ribs, of which four compose a wide, well- 

 defined, and moderately elevated mesial fold; beak pointed, incurved; sinus in ventral 

 valve shallow. Pig. 34 is about similarly shaped, but the surface of each valve has 

 about twenty small simple ribs. With regard to fig. 35, Quenstedt states, at p. 287 of the 

 work above quoted, that the specimen has its ribs divided like rimosa. It is, however, 

 Rh. rimosa and cannot be classed with fig. 34, which evidently belongs to another species. 

 Peeling that Rh. jurensis, as described by Quenstedt, was a very uncertain species, I wrote 

 to Dr. Praas upon the subject, and he, in the kindest possible manner, at once forwarded 

 me a specimen as a type. This, although possessing more ribs, most nearly approached 

 fig. 33 in shape. 



Taking Quenstedt's fig. 33 as the type of his Rh. jurensis, we find a similarly shaped 

 shell associated with Wald. Lycetti in several localities in the neighbourhood of Banbury, 

 and especially at the Bloxham cutting on the Banbury and Cheltenham Railway, and 

 always in the Zone of Am. communis or Upper Lias. Our English specimens do not 

 seem to have much exceeded six lines in length, by about the same in breadth, and three 

 in depth. 



It is not a rare fossil in the locality above named. Prom three to six ribs occupy 

 the fold, and these are generally more strongly marked on the anterior half of the shell. 



237. Rhynchonella Deslongchampsii, Dav. 



Mr. Charles Moore states in the ' Proc. of the Somersetshire Archaeological and Nat. 



