380 Reports and Proceedings — 



sniirus. The humerus closely resembles that of the edentate 

 Megalonyx before its epiphyses are ossified. There are four bones 

 in the distal row of the carpus, and thi'ee bones in the proximal row. 

 The characters of the dorsal surface are given from a specimen 

 preserved in the Albany Museum. 



The author then discusses the relation of Mesosaurns to Stereo- 

 sternum, as preserved in the British Museum, arriving at the 

 conclusion that the two genera are distinct, defined b}' characters 

 drawn from all parts of the skeleton. Stereosternum has four sacral 

 vertebrae, with the ilium extended far in front of the acetabulum. 

 The coracoids are regarded as meeting in the median line, and not 

 by ovei'lap as in the thin ossification of Mesosaurus. In both genera 

 there are five bones in the distal row of the tarsus. 



The author concludes that these types are closely allied to 

 Neusttcosmirus, which he would separate from the Nothosauria and 

 unite with the Mesosauria. That group is subdivided into two 

 divisions — the Proganosauria of Baur, and the Neusticosauria ; the 

 former being known from South Africa and South America, and 

 the latter from Europe only. 



3. " On a New Reptile from Welte Vreden, Ennotosaurus africanus 

 (Seeley)." By Prof. H. G. Seeley, F.R.S., F.G.S. 



The author obtained the specimen described at Welte Vreden, 

 near Beaufort West, Cape Colony, where it was found by Mr. L. 

 Pienaar in beds of Middle Karoo age. It indicates a small animal, 

 and shows the dorsal ribs, vertebrae, and part of the pelvis. The 

 centra are more slender than in any known South African fossil, 

 and conically cupped at the ends as in Mesosaurns, etc. There is 

 no indication of great transveivse widening of the neural arch. The 

 neural spine is compressed. The ribs appear to have been attached 

 much as in Chelonians, though the articulation is not seen. They 

 are remarkably massive, long, wide, compressed above, and sub- 

 triangular in transverse section. There may be some stei'nal ribs. 

 The OS pubis is thin and flattened, with a notch on the outer hinder 

 border like that seen in Mesosauria. The genus is probably referable 

 to that group, but distinguished from all known genera by the form 

 of the vertebrae and ribs. 



4. " The Dioritic Picrite of White Hause and Great Cockup." 

 By J. Postlethwaite, Esq., F.G.S. 



The rock, which is about two miles N.E. of the Little Knott rock, 

 formerly described by Prof. Bonney, was referred to by the author 

 as "a large mass of hornblende picrite of like nature" to the Little 

 Knott rock, in a paper published in the 'Transactions' of the 

 Cumberland and Westmoreland Association for 1889-90. Micro- 

 scopic examination by Prof. Bonney of the rock which is the subject 

 of the present communication confirms this determination. 



The metamorphism observable around this mass is considerably 

 larger than that seen round the Little Knott mass. 



5. "On the Structure of the American Pteraspidian, Palceaspis 

 (Claypole), with remarks on the Family." By Prof. E. W. Clay- 

 pole, B.A., D.Sc, F.G.S. 



