8 REPOUT OF THE 



curious and problematical fossil body known as the Aptychus or 

 Trigonellites of Parkinson. Being free from any investing 

 matrix they are more valuable to the Palaeontologist than the 

 Yorkshire examples of this fossil previously in the Museum, 

 from the Oolite Quarries at Malton. 



In local Geology the Collection has been enriched with a 

 splendid example of the Lepidotus semiserratus, or "scale fish" 

 of the Whitby Fossil-Dealers. This fish, along with many other 

 choice Lias fossils, has been obtained in exchange for the Society's 

 spare duplicates of Foreign Shells, the duplicates consisting 

 almost entirely of specimens that have accumulated from the 

 successive contributions of Mr. Joseph Clark of Cincinnati, 

 with whose cordial approval the exchange in question has been 

 carried out. 



Mr. Hailstone has presented the Museum with a Saurian 

 Vertebra from the Lias of Whitby, exhibiting a very remark- 

 able structural peculiarity, the area of one of its articulating 

 surfaces considerably exceeding that of the other. The Society 

 is also indebted to Mr. Robt. Atkinson for a very fine speci- 

 men of fossil wood from the Lias of the Coast. Various additions 

 have been made to the general Geological Collection from the 

 British Natural History Society, among the most important of 

 which are a series of choice fossils from the Magnesian Lime- 

 stone of Humbleton Hill, Durham, and a collection of specimens 

 illustrating the fossils of the upper green sand in the neighbour- 

 hood of Cambridge. 



At the meeting of the British Association held at Liverpool, 

 in September last, the Keeper of the Museum gave a description 

 of two fossils in the Museum of the Yorkshire Philosophical 

 Society, which are believed to be unique. One of these, a new 

 species of Saurian from Whitby, he described under the name 

 Teleosaurus ischnodon,* and to the other, a new fossil Quad- 

 ruped from Heme Bay, he gave the name Platychoerops f 

 Richardsonii. 



On the same occasion he was able to lay before the Associa- 

 tion some highly important additional evidence relating to the 



* Ischnodon, fecblc-tooth. t Platyolioeropg, wide-faced Hog. 



