126 BULLETIN 3(5, UNITED STATES NATIONAL MUSEUM. 



I fiud no reason to dissent from the opinion of these two eminent natur- 

 alists. I shall give attention, instead, to the qnestion of the rehitionsliip 

 of the specimens in our collection from the east coast of the Unitiil 

 States, and to that of the identity of G. Souverbianus Fischer, G. hicJi- 

 ardsoni Gray, and G. Stearnsii Ball. 



The material in the national collection comprises four adult skeletons, 

 ten skulls, a cast of an adult about 12 feet long, casts of two yuun^- 

 individuals about 6 feet long, and of three adult heads. All lliesi', 

 specimens are from Cape Cod, Massachusetts, whence they \^elc re 

 ceived in the fall of 1875. Professor Cope has figured two of the heads 

 and also an entire young individual (of which the cast is not at i)reseiit 

 to be found) in the Proceedings of the Philadelphia Academy (1 870, 

 PL III). 



The large cast (No. 12S39) is from a female, about 1,2 feet long. Its 

 dimensions are as follows : 



In. lius. 



Total length (straight line) 1:')() 



Extremity of suout to eye 15 



Extremity of suout to blowhole , 17 



Extremity of snout to corner of mouth 1 J 



Extremity of snout to anterior base of pectoral liu Ul 



Extremity of snout to anterior base of dorsal fin 50 



Length of pectoral fin along center 'JIV 



Greatest width of pectoral lin Hi 



Vertical height of dorsal fin ] 11 .} 



Length of base of dorsal fin 2i 



The cast represents one side only of the body. The general color, 

 covering the body and all the fins, resembles that of the portion of 

 Professor Flower's figures between the dorsal and pectoral fins, viz, 

 a steel-gray of medium depth and everywhere uniform. The lower 

 lip and chin, the margin of the upper lip, and an area on the belly 

 beneath the dorsal fin are of a light gray color, approaching white. 

 The whole body and the fins are traversed by irregular lines of a light 

 gray color and of varying width and length. 



This individual, therefore, differs from that figured by I'rofessoi- 

 Flower in being more uniform in color, the light areasbeing more limited 

 and the pectorals not mottled. 



The outlines of the body are i)ractica]ly the same in the two speci- 

 mens, but in ours the dorsal fin is less high and wider. 



One of the casts of the two young individuals (No. 1), which is GS 

 inches long (on the curves), is exactly like the young si)ecinien tignretl 

 by Professor Flower, except in the following particulars: The uj»]>er 

 parts are rather lighter, and the light color of the belly extends back of 

 the anus half way to the flukes. The diagonal stripes are represented 

 in our specimen by three vertical lines between the dorsal tin and the 

 flukes. In the specimen figured by Professor Cope,* which was ob- 



*Proc. Acad. Nat. Sci. Thila., 187G, pi. 3., 



