10 TUE BIlACIIIOrODA. 



only small sinuations, ])ut Sowerby's drawing is rathor misleading 

 in tliis respect. E. Doslongschamps says of this species " Touto- 

 fois la position stratigraphique precise et les caracteres de la T. 

 2)erovalis ont ete parfaitemeut mis en evidence par les travaux do 

 MM. Davidson et Oppel, et maintenant on sait que cette espoce 

 est Lien caracterisee et apparticnt specialmcnt au niveaux 

 inferieur de I'oolitbe inferieure, zone des A. Rowerbyi et 

 Murchisoncc, que nous designons sons le nom d'infra-oolithe." 



My own observations in this district entirely agree witli his 

 remarks. The true Terel. 'perovalis being very cliaractcristic of 

 the zones of Am. Murchisomn and Sowerlyi, and it is not found 

 higher or lower. It attains an extremely large size in both 

 zones, one specimen in my collection measuring — length, 2 

 inches 1 1 lines, breadth 2 inches 1 1 lines, depth 1 inch 8 lines. 



Localities. — Terel. perovalis occurs at Bradford Abbas, Half- 

 way House, Oborne, etc. (in Dorset), East Coker, and near 

 Gorton (Somerset), also Dundry (Somerset), Dinnington ; near 

 Cheltenham (Gloucestershire), and in France, and Wiirtcmborg. 



2. — Terebratula PiiiLLirsi, Morris. 



Teuebeatula PiiiLLiPSi {Movris), Davidson, British Fossil Brach. 

 Palroontographical Soc, plate xi., figures 

 6-8. 



Terebratula PniLLiPsi, E. Desl., Brach. Terr. Jurass, plates 67-72. 



This is a most marked species, at once to be distinguished by its 

 peculiar elongated shape, which is quite conspicuous even in very 

 young forms. E. Deslongschamps in the Paleontologie Fran(,'aiso 

 has given a fine series of figures of this species. Ho also figures 

 a specimen with an indication of three folds in the middle, but I 

 have not soon one from tliis district. His 3'ouug forms are also 

 very characteristic, and shew how very small the plications are 

 in 3-outh, sometimes being hardly perceptible. One characteris- 

 tic of this species is tlio small raised beak. In this district Tereh* 

 Pliillipsi is generally found in the zone of Cosmoceras Parkin- 

 son!, but it does occur in the zone of Humphriosianum, though 



