7. LAGENORHYNCHUS L. SUPEECILIOSUS AND ALBIROSTRIS. 171 



Measurements of the skull. — (Miis. d'Hist. Nat., Paris. No. a 3045. 

 Type.) Total leugtli, 34.9'='"; length of rostrum, 17.8«'"; breadth of 

 rostrum at the base, lO.T*""; at its middle, C.G*^"" ; breadth of intermax- 

 illie at same poiut, 4.P'"; breadth between orbits, 17.1""; length of 

 temporal fossa, 6.9^'^; depth of temporal fossa, 4.1<"". 



Habitat — Seas south of Cape Horn; Pacific Ocean. 



LAGENORHYNCHUS SUPERCILIOSUS (ScWegel). 

 (Plate 25, fig. 3.) 



Teeth |^. Vertebrae: C. 7, D. 13, L. 2D, Ca. 33=73. Skull similar 

 to that of L. ohliquidens, but smaller. Pterygoid bones (apparently) in 

 contact in the median line. Intermaxillic not broad proximally, flat in 

 the rostral portion; outer margins wavy. Length of rostrum exceediug 

 one-half the total length of the skull (54.5 per cent). Temporal fossa? 

 moderate, elliptical, directed obliquely upwards. 



In the skeleton the neural arches become obsolete at the sixtieth ver- 

 tebra; the transverse processes become obsolete at the fifty-fifth ver- 

 tebra.* 



Measurements of the skull. — (Mus. Pays-Bas. No. 40.) Total length, 

 35.G""; length of rostrum, 10.4""; breadth of rostrum at base, 8.5-'"; at 

 the middle, 5.4 "" ; breadth of intermaxilhi} at same p;)int, 3.2"" ; breadth 

 between orbits, 14.0""; length of temporal fossa, G.8'"'; depth of tem- 

 poral fossa, 4.5"". 



Habitat. — Cape of Good Hope. 



LAGENORHYNCHUS ALBIROSTRIS Gray. 

 (Plate 20, figs. 1 and 2.) 



Form like that of L. aciitus, but with more swollen forehead, more 

 attenuated and more strongly reclined dorsal fin and larger i)ectoral 

 fins. 



Forehead (except its base), back, and fins, black ; sides, grayish black ; 

 belly, white. Base of forehead, beak, and mandible white, more or less 

 tinged and shaded with gray. Three irregular areas of white on each 

 side, one of which is above the base of the pectoral fin, the second below 

 the insertion of the anterior margin of the dorsal fin, and the third 

 below the insertion of the posterior margin of the same; all considera- 



* As stated on page 92, Schlegel identifies this species with Lesson and Garnet's D. 

 superciliostts, but the reasons for so doing arc not apparent to the wi'iter. Lesson and 

 Garnot's description of the exterior of their animal is substantially as follows: Length 

 4 feet 2 inches (French); 'M teeth in the npper pair, 29 in the lower. Back, head, 

 and mnzzlo black. D;)rsal (situated in the middle of the back), pectoral, and candal 

 brown. Sides and belly white like satin. A white band passes abov^e the eye and 

 extends to the forehead; a white blotch near the tail. (Zool. Voy. Coquille, i, pt. 1, 

 1820, p. IHl.) 



