7. LAGENOEHYNCHUS L. THIC0L1<:A AND ELECTRA. 173 



divergent posteriorly; their posterointernal free margin sigmoid in 

 outliue. Vomer visible in the median line of the palate along al- 

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

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



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

 (221""); breadth of flakes, 24 inches (01""); extremity of snout to 

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



Measurements of the slcull. — (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 

 temporal fossa, 8.4'"'; depth of temporal fossa, 0.8"". 



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

 ( U. S. Nat. Mus.). 



LAGENOEHYNCHUS THICOLEA Gray. 

 (Plate 24, fig. 2.) 



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

 one-fourth its length; intermaxillse 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 fossae small and rounded. Margins 

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

 illa) in this part at a difierent angle from the plane of the distal half of 

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



Measurements of tlie skull. — (British Museum, 934rt. Typo.) Total 

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

 at its middle, 5.3'™ ; breadth of intermaxiihe atsame point, 2.8'"" ; breadth 

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



Habitat.— '^. West coast of North America. 



LAGENOEHYNCHUS ELECTRA Gray. 

 (Plate 28, figs. 1 au(I2.) 



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- 

 maxilliie 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 i)art of the superior surface of the skull. 

 Temporal fossre 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. Eami of mandible deep in the proximal half and 

 slender anteriorly ; the region of the symphysis obviously deeper than 



