7. LAGENORIIYNCHUiS L. THICOLEA AND ELECTKA. ' 173 



divergeut posteriorly; their postero-iuternal free margiu sigmoid iu 

 outline. Vomer visible in the median line of the j^alate along al- 

 most the entire distal half of the same, being replaced by the interuo- 

 inferior edge ot the intermaxilhe only at the extremity of the rostrum. 



Measurements of the exterior. — (From Dall.) Total length, 87 inches 

 (221™); breadth of flukes, 24 inches (01'"); extremity of snout to 

 anterior edge of dorsal fin, 30 inches (91.4 ""). 



Measurements of the sJcull. — (U. S. National Museum, n. n., adult.) Total 

 length, 41.3'"'; length of rostrum 20.9"'; breadth of rostrum at base, 

 11.8""; at its middle, 8.1""; breadth between orbits, 19.2'^'"; length of 

 temi)oral fossa, 8.4""; depth of temporal fossa, 0.8"". 



Eahiiat. — North Pacific Ocean; Monterey, California; Paget Sound 

 ( U. 8. Nat. Mus.). 



LAGENORHYNCHUS THICOLEA Gray. 

 (Plate24, fig. 2.) 



Teeth ^. Rostrum long and narrow, its breadth at the middle about 

 one-fourth its length; intermaxilhe flat and narrow; their combined 

 breadth at the middle of the beak contained seven and a half times in 

 the length of the beak. Temporal foss.ne small and rounded. Margins 

 of proximal half of rostrum thickened ; the superior surface of the max- 

 illaa in this part at a different angle from the plane of the distal half of 

 the rostral part of the maxilLne, which looks downward and forward. 



Measurements of the sJcull. — (British Museum, 934a. Type.) Total 

 length, 37.5"" ; length of beak, 21"" ; breadth of beak at its base, 9.7"" ; 

 at its middle, 5.3"" ; breadthof intermaxillajatsame point, 2.8"" ; breadth 

 between orbits, 10.3"" ; length of temporal fossa, 5.0"" . 



Hahitat.—l West coast of North America. 



LAGENORHYNCHUS ELECTRA Gray. 

 (Plato 2«, figs. 1 au(12.) 



For exterior, see p. 102. 



Teeth i^. Skull massive; rostrum broad, long, and flat, its length 

 always slightly exceeding one-half the total length of the skull. Inter- 

 maxilhe slightly convex on the rostrum, except in the distal third of the 

 latter, where their outer moiety is flat; their outer margins are sinuate. 

 Mesethmoid cartilage ossified in front of the nares to a point anterior 

 to the maxillary notches, forming part of the superior surface of tlie skull. 

 Temporal fossie moderate and squarish; upper tooth-row short, about 

 five sevenths thelength of the rostrum. Vomer appearing in the median 

 line of the palate opposite the middle tooth of the upper tooth-row. 

 Outline of combined postero-inferior free margins of pterygoid bones 

 strongly concave. Rami of mandible deep iu the proximal half and 

 slender anteriorly ; the region of the symphysis obviously deeper than 



