10. CEPKALORHYNCnUS C. ALBIFRONS AND llECTOKI. 177 



lengtb, 29.2"" ; ieugtb of rostruiu, 14'^"' ; breadth of ro.straiu at its base, 

 7.1™'; at its middle, 5.1""; breadtb of intermaxilhe at same point, 2.8"" ; 

 breadth between orbits, 13"" ; length of temporal fossa, 6,6"" ; depth of 

 temporal fossa, 4.8"". 

 Habitat. — Cape of Good Hope. 



CEPHALOEHYNCHUS ALBIFRONS True. 

 (Plate 3L>, figs. 1 aud 2.) 



Like C. heavisidei, but somewhat larger. Dorsal fin low aud ovate. 

 Pectoral fins falcate, equal in length to the base of the dorsal. Caudal 

 lobes narrow and directed backwards; deeply emarginate behind. 



Nose and forehead pure white, bounded by a crescent of black behind 

 the blowhole, sharply defined in front, but shading oil' behind to light 

 gray, which is the uniform color of the upper surface of the body. Fins 

 are all darker thau the trunk ; there is also pure black round the blow- 

 hole, cloaca, and vent. The white of the snout extends behind the eye, 

 but the dusky color extends forward beneath the angle of the mouth. 

 The lower aspect is white as far back as the vent, but is crossed by an 

 isthmus of dark gray beneath the pectorals. The white baud is con- 

 tinued by two lateral stripes that ascend on the tlauks. (Hector.) 



Teeth l\- The skull resembles that of C. heavisidei, but the rostrum 

 equals one-half the total length, and the pterygoid bones are long and 

 constricted at the base. Leugth of adult skull, 14 inches, 



Measurements of the exterior. (Hector.) — Total length, 51 inches 

 (129.5"") ; extremity of snout to dorsal fin, 24 inches (60.9"") ; to pec- 

 toral fin, 12 inches (30.5"") ; length of base of dorsal fin, 8 inches (20.3""); 

 breadth of fiukes, 15 inches (38.1""). 



Habitat. — New Zealand {Hector). 



CEPHALOEHYNCHUS HECTOEI (Vau Beneden). 

 (Plate 33, fig. 1.) 



Head conical, elongated; the snout only indistinctly marked off from 

 the forehead. Pectoral fins linear, obtusely pointed. Uorsal fin low, 

 ovate, strongly reclined. Caudal lobes narrow aud strong!}^ directed 

 backwards. 



Snout, forehead, back, sides, and fins dark gray or black, the latter 

 color most pronounced on the sides. A broad transverse band of gray 

 between the pectoral fins, which is abruptly joined posteriorly by a 

 broad white longitudinal band which extends along the median line of 

 the belly to the vent, behind which it breaks up into a trident-shaped 

 area, the central tine of which continues along the median line of the 

 belly nearly to the flukes, while the lateral tines pass obliquely up- 

 ward aud backward ou the sides. 

 18378— Bull. 36 12 



