1887.] 213 fCope. 



size of the ^Mississippi alligator. More perfect specimens will be awaited 

 with much interest. 



3. Episcoposaurus horridus. Gen. et sp. nov. 



This species is indicated by a number of bones which were excavated 

 at the same place. They are : Two caudal vertebrii?, a proximal and a 

 distal ; a humerus ; two ulnre ; a femur lacking the condyles ; a prox- 

 imal part of a tibia ; the distal part of a fibula ; a calcaneum, and a num- 

 ber of dermal bones. The only part of the skull possibly belonging to 

 this animal is a splenial bone. 



Char. Oen. The generic characters, so for as ascertainable from the 

 materials, resemble those of Belodon with certain exceptions. Chief 

 among the latter is the disproportion, in dimensions, between the ante- 

 rior and posterior extremities, which is as great as that existing in many 

 Dinosauria proper. Appropriately to this relation, the femur diflers from 

 that of Belodon in the absence of curvature of the shaft, having the 

 straight form of that of most Dinosauria proper. There are no trochanters 

 of any kind on this femur, and its head has the wedge-shaped Belodon 

 outline. The head and condyles of the humerus are transversely ex- 

 panded ; the shaft is contracted ; condyles not specialized. No epicondylar 

 foramina of either side, but a strong ectepicondylar groove, which cuts off 

 a narrow ectepicondylar ridge, which terminates freely. The caudal 

 vertebne are elongate, indicating a powerful tail. But one species is yet 

 known. 



Char. Specif. The body of the anterior caudal vertebra has a wedge- 

 shaped section, the apex inferior, representing the section of an obtuse 

 median keel. The articular faces are subcircular, widening upwards. 

 Both are concave, the posterior more so than the anterior, which is nearly 

 plane. No lateral ridges on the body. Arch lost. The posterior caudal 

 is long and slender, and has a long compressed neural arch. The section 

 of the body is heptagonal, as there are two low lateral angles on each 

 side, and an obtuse median inferior keel. The inferior lateral angle is 

 stronger than the superior. There is not so much difference in the con- 

 cavity of the articular extremities, as in the case of the larger vertebra. 



Dimensions of caudal vertebrm. M. 



Length of centrum of anterior vertebra 070 



-p.. , c . • f (transverse 050 



Diameters of anterior face -^ . , „,„ 



( vertical 048 



Length of centrum posterior vertebra 0G9 



transverse 033 



Diameters anterior face , . , 



t vertical 031 



The humerus is remarkable for the small diameter of its shaft as com- 

 pared with the expanse of its extremities. The long axes of these ex- 

 tremities make an angle of about 45° with each other. The articular sur- 

 face, which is co-extensive with the head, is long and narrow, widening 



