LAGENORHYNCHUS. 



Color. Sides of head and body gra}-: upper jaw, forehtad, back 

 of fins, black: sides of tail above, dusky yellowish ; below dorsal fin 

 on sides, a white oblong area. From base of flukes to the dorsal fin, 

 a narrow black line, and another from base of pectorals to corner of 

 the mouth; orbital ring black, from which a line goes to the beak; 

 vent black; base of flukes beneath and margin of tail whitish. Mar- 

 gin of lower jaw occasionally black. 



Measiireinents. Total length, 2515: ends of snout to pectoral, 

 406; to dorsal, 939; length of pectoral, 330 ; breadth of flukes, 635. 

 Skull: total length, 425; of rostrum, 216: breadth at base, 114: at mid- 

 dle, 76: iaterorbital breadth, 216: length of temporal fossa, 84 ; 

 depth, 43. 



38. thicolea. {Lageiiorkync/uis), Gra}', Proc. Zool. Soc, 1849, p. 2. 



Type locality. West coast of North America. 



Geogr. Distr. West coast of North America. 



Genl. Char. "Rostrum long, narrow, greatest breadth one- 

 fourth the length: intermaxilla^ flat, narrow; temporal fossa small, 

 rounded; margins of proximal half of rostrum thickened; the superior 

 surface of the maxillae in this part at a different angle from the plane 

 of the distal half of the rostral part of the maxillae, which looks down- 

 ward and forward." Only the skull known. 



Measurements. Skull: total length, 375; length of beak, 210: 

 breadth at base, 97; at middle, 53; breadth of intermaxillae at same 

 point, I'i; interorbital breadth, 163; length of temporal fossa, 56. 



39. albirostris. {Delphinus), Gray, Ann. Mag. Nat. Hist., 1846, p. 84. 

 ibsenii, Eschricht. Undersogelser over Hvaldyrene 5te Afh., p. 73. 



Fig. 8. LAGENORHYNCHUS ALBIROSTRIS. 

 I e.v-Liitken. Kgl. Danske.Videnskabs Selskabs Skrifter 6th Koekke IV. 1SS7. pi. 21 



