from the Ojrfunl Chiy of Peterhorouyh. 



41'.> 



many points to resemble Thaximatosaurus, l)nt which is 

 probably gcnerically distinct from the unimul originally 

 describLii under that name by von Meyer. 



A brief account of the new forms is now given. 



TiiiCLEiDUS, gen. nov. 



Small Plesiosaurs in which the skull is short and broad, 

 with twenty teeth on each side (five in the promaxilla, fifteen 

 in the maxilla). Pterygoids bear well-developed processes 



^.jr. 



Shoulder-pirdle of Tricleidua seelrt/i, 8p. n., from above. (Type specimen 

 R. 3o.{9.) About ^ nat. size, cl., clavicles; cor., coracoid ; I'.c/., 

 interclavicle; /fc, scapula ; r.«c., ventral plate of scapula. 



for union with the basisphenoid. Parasphenoid broad and 

 abruptly truncated in front. Quadrate region perhaps con- 

 sisting of two elements (? quadrate and quadrato-jugal). 



