126 BULLETIN 3t), UNITED STATES NATIONAL MU;SEUM. 



I iiud 110 reason to dissent from the opinion of these two eminent mitiu- 

 alists. I shall give attention, instead, to the question of the relntionshii) 

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

 States, and to that of the identity of G. Souverhianns Fischer, G. hick- 

 ardsoni Gray, and G. Stearnsii Dall. 



The material in the national collection conii)rises four adult skeletons, 

 ten skulls, a cast of an adult about 12 feet long, casts of two yuuii^' 

 individuals about G feet long, and of three adult heads. All tlie>e 

 specimens are from Cape Cod, Massachusetts, whence they weie rv- 

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

 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 (KSTO, 

 PI. III). 



The large cast (No. 12839) is from a female, about 12 feet long. Its 

 dimensions are as follows : 



Imlios. 



Total length (straight Hue) !:;(• 



Extremity of suout to eye iri 



Extremity of suout to blowhole , 1~ 



Extremity of suout to corner of mouth 1j 



Extremity of suout to anterior base of pectoral fin 2J 



Extremity of suout to anterior base of dorsal tin ^0 



Length of pectoral fin along center 21 h 



Greatest width of pectoral fin H^ 



Vertical height of dorsal fin 1:5t} 



Length of base of dorsal fin 22 



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 lins, viz, 

 a steel-gray of medium depth and everywhere nniforin. 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 Piofessor 

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

 and the pectorals not mottled. 



The outlines of the body are practically the same in the two speci- 

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



One of the casts of the two young individuals (No. 1), Avliich is 08 

 inches long (on the curves), is exactly like the young specimen figiirett 

 by Professor Flower, except in the following particulars: The uj.per 

 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 tlie 

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



*Proc. Acad. Nat., Sci. Pbila., 1870, pi. 3., 



