428 Reports and Proceedings— 



the same position in Hatteria. The author did not regard the speci- 

 men as giving support to Prof. Huxley's hypothesis of the Avian 

 affinities of Dinosaurs. 



16. "A Section through the Devonian Strata of West Somerset." 

 By Harry Govier Seeley, Esq., F.L.S., KG.S. 



In 1867 the author had visited the Devonian country in search 

 of the fault which Mr. Jukes supposed to traverse Devon and West 

 Somerset. He satisfied himself by sectional evidence that no fault 

 existed ; and in a section from Hurlstone Point to Brushford has 

 noted down the mineral character of the successive groups of strata 

 forming the country ; and the only folds of the strata seen by him on 

 that line of section. He thought that Mr. Etheridge's detailed 

 grouping of the rocks was better suited to the N.W. part of the 

 country than West Somerset, and that for that region the divisions 

 of strata used by Mr. Jukes were convenient. 



17. "On the Pectoral Arch and Fore Limb of OpMhalmosaurus." 

 By Harry Govier Seeley, Esq., F.L.S., F.G.S. 



After some remarks on the structure of the pectoral arch in Ich- 

 thyosaurus, the author described parts of a skeleton discovered by 

 Mr. Leeds in the Oxford Clay, on which he founded the genus 

 Ophthalmosaurus. 



The pectoral arch comprised the usual bones, but their relation to 

 each other was unusual. The clavicles form a strong arch ; the 

 lateral clavicles join behind by interlacing sutural union, and not by 

 overlap ; while in front the episternum (or interclavicle) is wedged 

 in between them so as to divide them. The coracoids are expanded 

 and grasped by the clavicles in a depression in their margins ; the 

 scapula is large. 



The humerus shows the usual Ichthyosaurian characters, and has 

 three facets at the distal end. To these correspond three bones in 

 the fore arm, the olecranon ossification being two-thirds as large as 

 the radius. The single row of carpal bones includes four elements. 



18. "The Glacial Phenomena of the Eden Valley and the Western 

 Part of the Yorkshire Dale District." By J. G. Goodchild, Esq. 

 Communicated by H. W. Bristow, Esq., F.E.S., F.G.S. 



This paper is a continuation, in a northward direction, of the 

 investigation of glacial phenomena which formed the matter of a 

 paper latel}'^ read before the Society by Mr. Tiddeman, and pub- 

 lished in the Society's Journal. It gives a detailed description of 

 the district treated of, the occurrence of ice-scratches, glacial erosion, 

 and glacial drift. The author considers that the phenomena re- 

 corded by him could not possibly have been produced by floating 

 ice, and therefore must have been caused by land-ice. In the drift 

 he finds evidence of a flow of ice from the south side of the Scottish 

 Southern uplands, and that the ice which filled the Eden Valley 

 seems to have had two opposite directions, the local ice flowing 

 from the high land of the south, pressing outwards far to the north 

 of the currents which flowed eastwards, the latter currents of ice 

 going up the Eden Valley, but apparently not having ground down 



