Geological Society. 181 



Sauropteiygia*, the ulna, 55, is broader than the radius, h 

 (PI. VIII. fig'. 1 ) ; and 1 would submit whether the antibrachial 

 bones have not been transposed in Prof. Marsh's figures, and 

 the ulna (marked r) placed at the radial side of the forearm. 

 In the copy of his fig. 1, in PL VIII. fig. 1, I have indicated 

 the several bones and digits by the symbols used in my 

 ' Archetype of the Vertebrate Skeleton,' pi. i., as also in the 

 figures 1-4 of the fore fin in the Quart. Journ. Geol. Soc. for 

 August 1878, p. 749. In the copy of Prof. Marsh's fig. 2 in 

 niv PI. VIII. I have transposed the position of the radius 

 and ulna, agreeably with the analogies above referred to. To 

 the restoration of the pelvic arch and appendages (PI. VIII. 

 fig. 3) I have nothing to object. 



The sum of Prof. Marsh's observations on his rich series of 

 American generic or subgeneric forms of Mosasaurians is 

 as follows : — " The new characters above presented are all 

 Lacertian rather than Ophidian. The important characters of 

 the Mosasaurians now known indicate that they form a sub- 

 order of the Lacertilia, which should be called Mosasauria"^. 

 In this conclusion I entirely concur : it is that to which 1 

 was led after comparison of the evidences of the extinct group 

 at my command in 1877 J. 



EXPLANATION OF PLATE VIII. 



Fig. 1. Sternum, scapular arch, and bones of the pectoral fins. (Edesto- 

 saurus.) 



Fig. 2. Bones of the pectoral tin, with Marsh's position of the antibra- 

 chial bones reversed. ( Lestosaurus. ) 



Fig. 3. Pelvic arch and bones of the pelvic tins. {Lestosaurus.) 



PROCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



■November 19, 1879.— Henry Clifton Sorby, Esq., F.R.S., 

 President, in the Chair. 



The following communication was read : — 



" Supplementary Note on the Vertebras of Ornithopsis, Seeley 

 {—Eucamerotus, Hulke)." By J. W. Hulke, Esq., F.R.S., F.G.S. 



The author in this communication describes several cervical and 

 trunk vertebras of this remarkable Dinosaur. The former are cha- 



* 'Monograph on the Fossil Reptilia of the Liassic Formations.' 4to. 

 In the Palseontographical volume, issued 1865j pi. i. Plesiosaurus doli- 

 chodeirus ; pi. ix. P. rostratw, pi. xiv. tig. 4. P. macrocephalus, fig. 6. P. 

 Mawkinsii. 



t Op. cit. p. 87 (1880). t L " c - «<■ 



Ann. & Mag. Nat. Hist. Ser. 5. Vol. iv. 13 



