PHOC^XA — CEPHALORHYXCHUS. 107 



24. Mamma of a gravid Porpoise, dissected by Dr David 



Hepburn ; see Journ. Anat. and Phys., vol. xxviii., 

 1894. 



25. Fcetus, male, 9 inches long, in spirit. Removed from 



uterus in December 1892. 



IV. CEPHALORHYNCHUS. (CRH.) 



Ceplialorliynchus, Gray, Cat. Cctacea, 1850. 



In size and general form approximating to the 

 Porpoise. Skull small, rostrum relatively broad ; 

 premaxillas tuberculated in front of nares and con- 

 cave on upper surface ; teeth small, acute ; summit 

 of skull hicfher than nasals. 



(1) CEPHALORHYXCHUS ALBIFROXS. (CrH. A.) 



Electra clancula, Gray, Syn. Whales and Dolphins; Hector, 



Trans. Neiv Zealand Inst., 1873. 

 Cephalorhynchus albifrons, F. W. True, Bidl. Uiiited States 



Nat Ihis., No. 36, 1889. 



Colour, upper part of body light grey, nose and fore- 

 head white, ventral surface white crossed with dark 

 grey stripe. Total length about 5 feet. Skull 

 about 14 inches long, rostrum one-half length of 

 skull ; dorsal fin low, ovate ; pectoral fin falcate. 



1. Skeleton, articulated, 3 feet 9 inches long, not adult: 

 pelvic bones and hyoid absent, manus imperfect. 

 Skull 11 1 inches long, 5| inches broad; beak 5^ 

 inches long, 2f inches broad. Premaxillai marked at 

 nasal end near the outer border by a longitudinal ridge, 

 internal to which the anterior surface is concave ; in 

 the beak this surface is flattened, relatively broad, 

 I inch in greatest breadth. The maxilla? form the 

 borders of the beak and are visible as far as the tip. 

 Nasals | inch broad at upper end, project upwards 

 for ^ inch. Vertex cranii higher than nasals. Ptery- 

 goids separated by a wide cleft. Mandible 8| inches 



29 29 

 long, symphysis -| inch. Teeth, ^ ^, acute ; costal 



cartilages ossified, upper four pairs articulate with 

 sternum. Vertebral formula C-Dj.^LjgCd,- = 64. 

 New Zealand. Donor— Sir Jas. Hector, K.C.M.G., 1872. 



