312 E. Westlake — Terehratula from the Tipper Chalk. 



divisions of the latter, since it would perhaps be inadvisable to 

 retain the names Eusuchia and Mesosuchia in a minor sense to their 

 original usage, and as it is in many cases important to have a 

 classification not depending solely upon cranial characters, I would 

 adopt the earlier Owenian names to form a Procoelian and an 

 Amphicoelian series. The former series would be characterized by 

 the possession of proccelous vertebrae, and at least usually by the 

 union of the pterygoids in a palatal plate below the narial canal. I 

 add the saving clause in the last paragraph because it is highly pro- 

 bable that in some of the proccelous Grocodilia of the Cretaceous the 

 pterygoids did not unite inferiorly. 



The following table gives the grouping of the families under 

 this scheme ; the definition of the various groups being reserved for 

 a future occasion. 



Order Grocodilia. 



A. Suborder Grocodilia Vera. 



a. Procoelian series. 



Crocodilidm. 



b. Amphicoelian series. 



Goniopholididm. 

 TeleosauridcB. 



B. Suborder Parasuchia. 



£elodontidcB. 



Parasuchidce. 



Stagonolepididce. 



P.S. — Since the above was in type I have received a memoir by 

 Dr. Koken on the Grocodilia of the German Wealden (Palaonto- 

 logische Abhandlungen, vol. iii. pt. 5, 1887), in which the skull of 

 Pliolidosaurus (Macrorhynchus) is figured. In this memoir the 

 author has proposed precisely the same classification as that given 

 above, although he adopts one or two more families, and has not 

 proposed a name for the first suborder. 



V. — On a Teeebratula from the Upper Chalk of Salisbury. 

 By E. Westlake, F.G.S. 



THE two specimens figured below are from the collection of Mr. 

 C. J. Eead, of Salisbury, who obtained them from the Upper 

 Chalk (Senonian) of the neighbourhood. Some uncertainty has 

 attached to the exact locality, Mr. Eead having told me that he had 

 found them in the Mucronata-Chaiik of Clarendon ; but he now writes, 

 18th Jan. 1887 — " My belief, on thinking the matter over, is that 

 the right locality is the 'Devizes Eoad,' as they were originally 

 marked." The locality referred to is Old Camp Down lime-pit, 

 three miles N.W. of Salisbury on the Devizes Eoad. This pit is 

 characterized by an abundance of Micraster coranguinum and Echino- 

 conus conicus ; but Terehratula semtglobosa, Sow., usually present in 

 this zone, does not occur, and the only Terebratulae we have found 

 there are the two specimens figured. As the pit is seldom worked 

 and we have no prospect of obtaining others, it has seemed best to 

 describe them. 



