472 THE GEKUS HARBIOTTA—GOODE AND BEAN. 



filamentous tip, the fin below much more extensive than that above. 

 No cephalic organ. Gill -openings lateral ; separated by a wide isthmus. 

 No spiracles. Teeth as in Chinuvra. Claspers small and simple. 



HARRIOTTA RALEIGHANA, new species. 



Plate XIX. 



Tail extended in a very long filament in the older individuals, want- 

 ing in the young. Tlie first dorsal fin separated from the second by an 

 interval nearly efjual to the diameter of the eye in the older individuals, 

 very much greater in tlie younger ones, in which the cartilaginous por- 

 tion is exceedingly narrow and high. The second dorsal fin long and 

 low, its height about eiiual to the diameter of the eye, its length equal 

 to that of the head. The spine preceding the first dorsal fin is very 

 strong; its length in the older individuals equal to the distance from 

 its own base to the origin of the second dorsal ; it is proportionately 

 much longer and stouter in the young, and there is also a double row 

 of strong spines in advance of the second dorsal, and in the notch 

 between the second dorsal and its continuation upon the upper 

 part of the tail; and there is also a similar group of at least six 

 strong spines u[)on the top of the head back of the interorbital space, 

 and surrounded by the curve of the forward extension of the lateral 

 line. Faces of these spines may be felt beneath the skin in older 

 individuals of both sexes. Claspers in the young male examined, 

 small and simi)le, in length scarcely equal to two-thirds of the long 

 diameter of the eye. Pectoral fins immense, wing-like, rounded in 

 the young, subfalcate in the older individuals; inserted slightly in 

 advance of the origin of the first dorsal, and extending in the older 

 forms beyond the root of the ventral. Ventrals also vsubfalcate; similar 

 in form and appearance to the pectoral, and extending to a point at two- 

 thirds of the distance from the origin to the end of the second dorsal; 

 in length little less than half the snout. In the young, the ventrals are 

 placed somewhat farther back, and reach to a point under the origin 

 of the third section of the dorsal fin. The tail is prolonged in a 

 slender filament, and in the older individuals the cutaneous flap upon 

 its lower edge is three or four times as deep as that above, and 

 extends beyond it anteriorly and posteriorly. In the younger speci- 

 mens the upper and lower flaps are about equal in height, and the 

 upper flap extends far in advance of the insertion of the lower one. 

 The lateral line extends in a straight line from a jioint beneath the 

 origin of the first dorsal approximately to the middle of the lower 

 caudal lobe, which it follows along its base for the remainder of its 

 course; in advance of the dorsai fin it bends downward in an elliptical 

 curve, and then rises vertically from the occiput to join its counterpart 

 from the other side; bridle like extensions of the same system extend 

 on the sides of the head under the eye, curving upward in front of the 

 eye, then downward and joining on the under side of tbe snout to a 

 branch running from beneath the eye downward to the base of the 



