266 Geological Society. 



Family Ophiopleuridae. 



Genus Ophiopleura, Dan. & K. 1877. 



1. OpMopleura horealis.^ Dan. & K. 



2. OpJdopleura arctica, Duncan. 



I have to express my thanks to the Rev. A. M. Norman, 

 F.L.S.,for sending me the " Separat-Aftryk " and for draw in g 

 my attention to the identity of Ophiopleura and Liitkenia. 



August 9, 1878. 



PROCEEDINGS OF LEARNED SOCIETIES. 

 GEOLOGICAL SOCIETY. 



March 20th, 1878.— Henry Clifton Sorby, Esq., E.R.S., 

 President, in the Chair. 



The following communications were road : — 



1. " Note on an Os articulare, presumably that of Iguanodun 

 MantelU." By J. W. Hulke, Esq., E.R.S., F.G.S. 



In this paper the author described what he believed to be the os 

 articulare of Irjuanodon MantelU, from the best specimen of a series 

 of five collected by the Rev. W. Fox, of Brixton, in the Isle of Wight. 

 He remarked that the mandible represeuted by this bone differs 

 greatly from that of the Crooodilia, and in a less degree from that 

 of extant Lizards, while iu some respects it resembles that of Hyp- 

 silopJiodon Foxii, From this resemblance and the relative abund- 

 ance of the bone in the same beds which have yielded mandibular 

 rami of Ljminodon, ho felt justified in referring the bone to the 

 latter Saurian. 



2. "Description of a new Fish from the Lower Chalk of Dover." 

 By E. TuUey Newton, Esq., F.G.S. 



The author referred to his previous descriptions of fishes from 

 British Cretaceous rocks belonging to Prof. Cope's genera Portlieus 

 and Ichthyodectes, and stated that he had since obtained a form 

 referable to the allied genus Daptinus. The specimen is in the col- 

 lection of the British Museum, and was procured from the Grey 

 Chalk of Dover by Mr. Gardner. It consists of the head and some 

 vertebrae, the characters of which are described in detail by the 

 author, who stated that in some characters, especially the degree of 

 flattening of the teeth, the fish seems to stand between IcMhijodectes 

 and Daptinus, and hence proposed to name it Daptinus interme- 

 dius. The author further noticed the existence in the British Mu- 

 seum of a right maxillary bone from the Lower Chalk of Dover, 

 which he thinks may indicate a second species of the same genus. 



