S. S. Buchman — Jurassic Brachiopoda. 217 



1879. If. primigenius, J. Probst, ibid. pp. 158-162, pi. iii. figs. 1-5. 

 1885. ,, ,, F. Noetling, Abh. Geol. Specialk. Preussen u. Thiiring. 



Staaten, vol. vi. pt. 3, pp. 17-19, pi. i. figs. 4, 5. 



Among the fossil Notidanidas, the dentition of N. primigenius 

 appears to be more completely known than that of any other. 

 Lawley in Italy, and Probst in Wiirtemberg, have both contributed to 

 its elucidation, and though Agassiz stated that during his elaborate 

 researches he had only succeeded in determining lower teeth, there 

 can be little doubt now that he also figured some belonging to the 

 upper series. It seems probable that fig. 13 of plate 27 in the 

 " Poissons Fossiles" really represents a tooth of the upper jaw ; and 

 if the originals of figs. 4-8 are correctly associated with the others 

 (which is perhaps questionable), these likewise must be referred to 

 a similar situation : it is almost certain, too, that the so-called N. 

 recurvus is an upper tooth of the same species. 



In the mandibular teeth of N. primigenius (Fig. 22), the principal 

 cone is only slightly longer and more robust than that immediately 

 following, but the lower part of its anterior edge is much produced 

 forwards and bears a number of small serrations, which decrease 

 in size from above downwards. The secondary cones gradually 

 diminish as they approach the hinder end of the crown, and of these 

 there are usually five or six. The median lower tooth is not yet 

 certainly known, although both Probst and Lawley venture to claim 

 its discovery. The former figures it as having a median cone, while 

 the latter represents it as possessing only lateral cones — so that as 

 it is impossible for these to belong to the same species, neither deter- 

 mination can be accepted as correct until more satisfactory evidence 

 of association is forthcoming. 1 



(To be continued in our next Number.) 



III. — Notes on Jurassic Brachiopoda. 

 By S. S. Euckman, F.G.S. 



THE following notes relate to two Brachiopods — a Bhynchonella 

 and a Terebratula — figured by the late Dr. Davidson in his last 

 plates in the Palseontographical. Of the first a change of name is 

 necessary; of the second, I consider that the identification needs 

 revision, and that it deserves a separate name. Both species are 

 from the Inferior Oolite. 



Khtnchonella liostraca, S. Buck. 



1883. bhynchonella bilobata, S. Buck., Bracbiopoda Inf. Ool. Dorset, Nat. Hist. 



Soc. Proc. vol. iv. p. 50. 

 1884. bilobata, Davidson, Appendix to Supplement Bracbiopoda, 



Palseontograpbical Soc. Proc. vol. 38, plate 19, 



figs. 18, 19. 



Having given the above references, there can exist no doubt as to 

 the species intended ; but having subsequently found that the name 

 bilobata had been used for a species of Bhynchonella previous to my 



1 In his second paper (1879) Probst confirms bis original determination (1858) and 

 suggests tbat Lawley's fossil probably belongs to If. gigas or If. Meneghinii. 



