180 BULLETIN 3(5, UNITED STATES NATIONAL MUSEUM. 



Teeth, |. Vertebrte, C. 7; D. 12 or 13; L. and Ca. 44 to 47; total, 

 04 to 67. 



Rostrnin thick, obtusely pointed ; its margins shelving ; its length 

 between 40 and 47 per cent, of the total length of the skull, and never 

 surpassing the breadth at the orbits. Depth of the temporal fossa 

 contained about two and one-half times in the tooth-line. The latter 

 equal to or more than one-third the length of the skull. 



Measurements of the exterior.— { $ adult.) Total length, OS inches 

 (172.7"='") ; length of mouth, 4.75 inches (12.1'^"') ; tip of snout to dorsal 

 fin, 29 inches (73.7"") ; length of pectoral fin, 7 inches (17.8""); vertical 

 height of dorsal fin, 4 inches (10.2™; breadth of flukes, 12.5 inches 

 (31.7""). 



Measurements of the sMll. — Total length, 29.3'"'; length of rostrum, 

 13.7"" ; breadth of beak at base, 8.5""; breadth of the same at its mid- 

 dle, 5.5""; breadth between orbits, 13.7""'; length of temporal fossa, 

 G.O"" ; height of crown of largest tooth. 



Habitat. — North Atlantic and North Pacific Oceans; North Sea; 

 coast of Europe; Davis Strait to 07° or 69° north latitude (Z?ro?c'H) ; 

 coast of the United States, Maine to New Jersey; Alaska, Glacier 

 Bay; Puget Sound; Mexico, Banderas Bay (Scammon). (Ascends 

 rivers.) 



PH0CJ2NA SPINIPINNIS Burmeister. 

 (Plate 36, figs. 1 aud2.) 



Body fusiform, stout. Head rounded, with a short, not well-defined 

 beak. Lower jaw longer than the upper. Dorsal fin narrow, reclining, 

 the anterior margin concave and furnished with numerous rugosities, 

 the posterior margin convex. Pectoral fins falcate. Superior and in- 

 ferior margins of the tail raised into ridges. 



Teeth J^ thick. Mouth less than one-third the length of the pectoral 

 fin. Dorsal fin commencing below the middle of the length of the body. 



Color black throughout. 



Proportions of skull nearly as in P. communis^ but the toothliue less 

 than two-thirds the length of the beak. 



Measurements of the exterior. — Total length (of the young type; after 

 Burmeister), (J4.8 inches (1G2''"); length of mouth, 3.4 inches (8.5""); tip 

 of snout to dorsal fin, 36 inches (90*^^'") ; length of pectoral fin, 10.4 inches 

 (26-'"); height of dorsal fin, 5 inches (12.5'^'") ; breadth of flukes, 15.6 

 inches (39""). 



Measurements of the sJcull. — Total length, 29<^™ ; length of beak (to root 

 of malar), 12.2""; breadth of beak at base, 8.0""; at the middle, 5.5""; 

 breadth between postorbital processes of frontal^ 16.2""; length of tooth- 

 line, 7.0"". 



