﻿308 HALLOWELL ON 



to the occiput, suboval in shape, their upper surface, as well as that of the head and 

 its sides, rough, from the numerous asperities with which it is covered ; body more 

 or less covered with rounded tubercles above ; thighs granulate posteriorly ; two well 

 marked glands, triangular in shape, upon the upper surface of each thigh near the 

 groin ; two others, much larger, are seen upon the breast, between the anterior ex- 

 tremities ; abdomen, throat and under surface of extremities smooth ; tubercles 

 beneath the fingers and toes ; those at base of thumbs and upon palms much larger ; 

 projection of the cuneiform bone much developed, with a well defined edge. 



Coloration. — The ground color above is violet or olive ; the body and sides pre- 

 senting numerous large dark colored ovoid spots, with a very narrow margin of white ; 

 the interspaces between these spots, in the young and middle aged specimens, are of 

 a beautiful rose color ; extremities olive colored above, with large and broad bands of 

 black, margined with white ; the interspaces more or less tinged with rosy red'; 

 under parts white, mingled with yellow ; chin and throat with numerous black 

 spots ; abdomen also black spotted, but much less thickly than the chin and throat, 

 sometimes without spots. 



Dimensions of the largest specimen. — Length of head 1 inch 4 lines; greatest 

 breadth 2 inches 3£ lines; breadth of bucklers 1 inch 7z lines; length of body 3 

 inches; breadth 3 inches 2 lines; length of anterior extremities 2i inches; of arm 

 1 inch 2 lines; of forearm 1 inch; of palm and longest finger 11 lines; of thigh 1 

 inch 4 lines ; of leg 1 inch 1 line ; of sole and longest toe 2 inches ; of posterior 

 extremity 4 inches. 



Anatomy. — The structure of the skull in this genus resembles that of Ceratophrys, 



but it is comparatively longer, and the teeth are much more highly developed. The 



orbitar foramina are widely apart in Ceratophrys. The skull in Trigonoplirys is 



covered all over with well marked rugosities, the temporal fossge are much larger in 



the latter; the skull itself is triangular in shape, depressed in front, hollowed between 



the orbits, consisting of a solid bony case, with traces of sutures only in front of the 



latter; the orbitar foramina are subcircular in shape, measuring 4 \ lines transversely, 



and are three lines apart ; the occipital foramina are large and oval ; upwards of 



fifty recurved conical teeth may be counted in the upper jaw, the anterior much 



the larger ; the openings of the internal nares are oblong and quite large ; two small 



bunches of palatine teeth are situated at their inner extremities on a line with their 



anterior margin ; the nostrils are small, three lines apart, about four lines from the 



anterior extremities of the cranium. There are eight vertebrse, exclusive of the 



atlas and sacrum ; the spinal processes of the first are much more developed than 



those which follow ; the transverse processes are seven in number, of these the 



second and the third are the longest, the former measuring five lines in length ; the 



