124 



MEMOIRS OF THE UNIVERSITY OF CALIFORNIA. 



The characters of C. piscosus differ from those of C. petrinus and C. nevad- 

 sufficiently to warrant specific separation. As far as this form is known, 



there seems to be no reason for making 

 a generic separation between it and the 

 better known C. petrinus. 



The vertebrae which are present in 

 the type specimen (fig. 137) represent 

 an individual smaller than the aver- 

 age of C. petrinus or of C. nevadanus. 

 They belong in the anterior or middle 

 dorsal region, as the parapophyses 

 have disappeared and the diapo- 

 physes are elongated inferiorly. The 

 upper arches are thicker than in Icli- 

 thyosaurus, and the zygapophyses are 

 large. 



Fig. 137. Cymbospondylus piscositu Leidy. 

 view of type specimen, X 1 X>- 



CYMBOSPONDYLUS NEVADANUS, n. sp. 



Represented only by individuals of larger size than the average of known 

 specimens of C. petrinus. Epipodials ( ?) of posterior limb much shorter and 

 more massive than in C. petrinus. Tibia ( ?) very short and thick ; distal end 

 not narrower than proximal end, and without the flat anterior face present in 

 C. petrinus. Middle caudal vertebrae high and narrow. 



Type specimen, no. 10620, Univ. Calif. Col. Vert. Palae. (pi. 13), from New 

 Pass, thirty miles west of Austin, Nevada. 



In the summer of 1906 an expedition to New Pass, Nevada, visited the out- 

 crops of Triassic limestone in that region, and made careful search for saurian 

 remains in the hope of finding satisfactory material corresponding to Leidy's 

 ( ' ijinbospondylus piscosus. Small limestone outcrops were found near the pass, 

 and about three miles west of the New Pass mines. They are so distinctly 

 set off from the areas of other rocks that there can be little doubt that the 

 locality visited is the one from which Leidy's specimen of Cymbospondylus 

 piscosus was obtained. Several isolated fragments of vertebrae and ribs were 

 obtained ; and one specimen (no. 10620) including a number of anterior caudal 

 vertebrae, fragments of ribs, and several elements of the posterior limbs was 

 found in place in the limestone. All of the saurian material from the New 

 Pass limestones seemed to come from a single stratum about three feet in thick- 

 ness. No new material was found which can be referred to Cymbospondylus 

 piscosus. The Triassic limestones at the New Pass locality are stated by Pro- 



