14 BALAENOPTERA. PHYSETER. 



20. sulfureus. (Sihhii/ifiiis), Cope, Proc. Acad. Nat. Scien. Phil., 1869, 



p. 20. 



Type locality. Northwest coast of America. 



Geogr. Distr. North Pacific Ocean, Bering Sea, shores of Cali- 

 fornia northward. 



Genl. Char. Largest of living animals; body slender; pectorals 

 small, short, ends rounded. Dorsal fin small, placed far back; 

 baleen broad at base. 



Color. Above light brown or brownish black, sometimes whit 

 ish; beneath yellow or sulphur hue. Baleen black or bluish black. 



Measurements. Total length, 95 feet; circumference, 39 feet; 

 length of mandible, 21 feet; longest baleen, 4 feet; weight of baleen, 

 800 pounds; estimated weight of animal, 147 tons (Scammon). 



21. stynegeri. {Mesoplodon), True, Proc. U. S. Nat. Mus., 1885, p. 584, 



Pl- 25- 



Type locality. Coast of the Commander Islands. 



Geogr. Distr. Bering Sea. 



Genl. Char. Skull: "Brain case little less than half the length 

 of the skull. No basi-rostral groove. Premaxillary foramen pos- 

 terior to the maxillary foramen. Premaxillary bones not grooved 

 in front of the foramen, assuming a nearly vertical position anterior 

 to the middle of the back; not greatly expanded laterally back of 

 the nares. Occipital bone plane above the condyles, concave at the 

 vertex. Exposed portion of vomer less than one-fifth the length of 

 the beak." (True, 1. c). Only the skull known. 



Fam. II. Physeteridae. 



Upper jaw without functional teeth; those in mandible various, 

 number often reduced. Pterygoids meeting on the median line, and 

 hollowed on outer side. Transverse processes of the arches of dor- 

 sal vertebrae cease near the end of the series and are replaced at a 

 lower level by processes on the body. Costal cartilages not ossified, 

 cranium elevated into a prominent crest behind the nares. Cranium 

 assymmetrical around narial openings. 



Sub. Fam. I. Physeterinae. 



10. Physeter. 



-^=^ to -^^=^ =40 to 50. 

 20 — 20 25 — 25 ' -^ 



Physeter. Linn. Syst. Nat., 1766, p. 107. Ty^e P. macrocephalus. Linn. 



Tursio. Fleming, Phil. Zool., 1822, 11, p. 211. 



Upper teeth rudimentary; lower jaw with 20 to 25 on each side, 

 short conical, pointed and recurved; posterior and lateral edges of 



