PLATE 66. 



DISCOBATIDAE. 



Fig. 1-3. DiscoBATUs SINENSIS (Page 289). 



The figures are taken from a female twenty-five and one fourth inches in length. The lower surface, 

 fig. 2, has been dissected out so as to show the skeleton and the viscera. The mouth, fig. 3, was drawn as 

 it appeared before dissection. Attention is directed to several features in which Discobatus to some 

 extent ap])roaches the Narcaciontidae. The rostral cartilage, r, ends abruptly a short distance in front 

 of the skull and is supplemented by soft flexible branched extensions somewhat like those of Narcine. 

 The antorbital, ao, has greatly extended forward and outward. The branchial rays are expanded at 

 their outer extremities. There is a triangular group of ampullae, an incipient battery, opposite the end 

 of each lower jaw. The copula, h br', is unsegmented. The pelvis is very wide; it is provided with 

 a slight anterior process at each end. The propterygium of the ventrals is considerably branched at 

 its distal end. With the exception of the liver, which is indicated by dotted lines, the viscera are 

 shown in position. 



