Manchester Memoirs, Vol. liv. (i9ro), No. 11. 



XI. "Upper Liassic Reptilia. Part II. The Saurop- 

 terygia of the Whitby Museum." 



By D. M. S. VVat.son, B.Sc. 



Received and read .March Sl/i, rgio. 



The most important of the Sauropterygian remains in 

 the Whitby Museum is the specimen which is the type of 

 Blake's species Plesiosaunis propinquus. 



This specimen bears the number 581 and is a nearly 

 complete skeleton : it is unfortunately secured to the wall 

 of a narrow room at a considerable height, and despite 

 the facilities most kindl)- granted to me by Mr. T. Newbitt, 

 I had some difficulty in examining it and m}' measure- 

 ments are only approximate. 



Measttreniejits 0/ Skeleton. 



Skull 



23 cervical vertebrae 



5 pectoral „ 

 28 dorsal „ 



2 sacral 

 31 caudal 



57 cms. 

 100 



26 

 138 



9 

 1 10 



440 



The Skull. 

 The skull is large, more than one-eighth of the entire 

 length : it is considerabl\^ damaged, and no sutures are 

 visible. On the left side the Squamosal, Quadrate, and 

 Jugal to just behind the post-orbital bar are missing, and 

 on the other side even this is broken away. 



May 6ih, igio. 



