Geological Sociefi/. 401 



disunited whorls ; and the species, which the author named C'am- 

 ptocems priscum, is elongate, with the apox very acuminate and 

 slightly curved, and consists of four whorls rather rapidly increasing 

 and constricted at intervals, then hccoming tumid. The surface 

 shows slight indications of spiral rihbing in the casts. The aperture 

 is not distinctly shown, but was evidently oblique, circular or 

 oblate, and slightly reflected. The length of the shell was about a 

 quarter of an incli. Numerous specimens were obtained in a single 

 fragment of clay. 



2. " Note on the Os Pubis and Ischium of Ornkhopsia eticamerotu.f 

 (synonyms — I'JucamcrotKs, Hulke ; Bothrioapondylus (in part), R. 

 Owen ; Chondroskosfmrus, 11. Owen).'' 13y J. \V. Hulke, Esq., 

 F.R.S., Pres.O.S. 



In this paper the author reviewed the various contributions to 

 the knowledge of this Dinosaur, for which he adopted Prof. Seeley's 

 generic name Ornithopsis, employing the name eucanierolus, origi- 

 nally applied by him to the genus, as the specific name. He also dis- 

 cussed the affinities existing between OniHhoj)sis and certain oth(;r 

 Dinosaurs, such as Cdeosaurvs and the American genera C'dmara- 

 saunts, Athtntonoiinis, 'dud BrontoHaurus. He then descrilted the pubis 

 and ischium which have recently been acquired by the British Museum 

 from the collection of the late Rev. W. Fox, by whom they were 

 purchased, together with the finest typical thoracic vertebra) of 

 Ornithopsis. The pubis Avas described as an oblong, flattened, 

 nearly straight bar, about 11 inches wide in the middle and broader 

 at the two ends, with an oval foramen in the acetabular dilatation 

 of the proximal part, which unites by a straight suture with the 

 anterior dilatation of the ischium ; the latter is narrower, stouter, 

 and more curved than the pubis. The length of the pubis is 

 about 29 inches, and that of the ischium about 20 inches. At 

 the proximal end of the ischium there is a posterior process which 

 united with the ilium and formed the posterior boundary of the 

 acetabulum, the inner border of this and the posterior ])art of the 

 proximal surface of the pubis forming a common curve belonging to 

 the acetabulum. The author compared the arrangement to tliat 

 found in Atlantosaurvs immunis, !Marsh. 



3. " On Kensticosaurus pusillus (Fraas), an Amphibious Reptile 

 having affinities with the terrestrial Xothosauria and with the marine 

 Plesiosauria." ]5y Prof. II. G. Seeley, F.R.S., F.G.S. 



These remains come from the Lcttenkohle, a stratum between the 

 Upper Muschelkalk and Keupcr, and were obtained at Hoheneck, 

 about 9 miles north of Stuttgart. They have been already noticed 

 by Dr. Fraas under the name of ,Simomurus pusillus ; but flio 

 palate differs much from that of this genus, and from all others that 

 are known. Neiisticosaurus is the smallest representative of the 

 Plesiosauria yet known, and has a special interest as exhil)iting 

 hind limbs with the characteristics of a terrestrial animal, while the 



