Mr. S. S. Buckman on Jurassic Brachiopoda. 393 



valve with a broad shallow sulcus; the beak without dotiuite 

 ridges ; the foramen round. 



lieviarks. — Topotypes kindly given to me some years ago 

 by Mr. E. Waltbrd, F.G.S., show that this form is really a 

 Terebratuloid, and has not the septum nor the tbrm of beak- 

 ridges and foramen characteristic of Jurassic Dalliniiiro. It 

 is a honioeomor[)h of Urthotoma toarciensis (= 7'. Lfjcetti, 

 E.-Deslong.), which does show these features, and, moreover, 

 occurs nearly at the same horizon, so that mistake is easy. 



The sulcate dorsal valve suggests that the present species 

 is an early form of the genus Pseudoc/lossot/it/ris, a genus 

 which is in character allied to the Nuclcatai, and is not one 

 of the Bi[)licatfle. Davidsou^s tigs. 20^ 21 of pi. vii. vol. i., 

 cotypcs of T. Lycetii, probably beloDg to the present species ; 

 at any rate they must be removed from Oniithel/a Lycetti 

 (Dav.). 



Ttrthratula {^WaJdliciinia, ZclUeria) j) erf o rata ^ auct. 



Certain species which have been known by the trivial 

 Wdmt perforata, coupled with the generic names given above, 

 would perhaps be better assigned provisionally to Oraitkella 

 than to Zeitleria. Probably they belong to neither genus, 

 but require a new designation ; the same remark applies 

 to the species described above, assigned to Ornitliella : this 

 point, however, cannot be settled till there be information 

 concerning internal details. At present, vice Waldkeitnia 

 discarded through prior use, there are the generic names Orni- 

 iheila and ZeilUria tor these forms. They are not Microthyris^ 

 and certainly not Orthotoma, nor Gincta. 



Eudes-Deslongchamps used the name " Terehratula per- 

 forata, Piette," altiiough he admitted that the designation 

 T. perforata had already been apj)lied to a Tertiary shell. 

 ISo Piette's name must fall. The same author says that 

 he has refiguied, in his pi. xi. tig. 1, Martinis type of 

 T. strangulata as T. pe>forata. If so, Martin's figure is 

 bad. But taking Eudes-Deslongchamps's word for it, then 

 T. stranyulata, Martin, is a much larger form than what is 

 known in England as T. perforata. 



But our Lower Lias shell had been named long before 

 Piette or Martin wrote j for it is the type of d'Orbigny'd 

 T. sarthacensis. Why this was overlooked by Davidson, 

 Deslongchamps, and others is probably because d''Orbigny 

 placed the species in his Toarcian, and also gave a reference 

 which caused confusion, lie quoted T.ornitkocephala, JSow., 

 pi. ci. tig. 5, which in our English work appears wrong. 



