40 RHACHIANECTES. MEGAPTERA. 
Fig. XV. BALEEN WHALE ATTACKED BY KILLER WHALES. 
Riverside Nat. History. 
14. Rhachianectes. 
Rhachianectes Cope, Proc. Acad. Nat. Scien. Phil., 1869, p. 15. 
Type A. glaucus Cope. 
Head small, body elongate; pectoral fin narrow; no dorsal fin; 
skin of throat smooth; baleen short and coarse. 
26. glaucus (Agaphelus), Cope, Proc. Acad. Nat. Scien. Phil., 1869, 
LTS. 
glaucus (Rhachianectes) Elliot, Syn. N. Am. Mamm., 1901, p. 9. 
Gray WHALE. 
Type locality. Coast of California. 
Geogr. Distr. Coast of Lower California to north Pacific and 
Arctic Oceans; Okhotsk and Bering Seas. 
Genl. Char. Superior outline of head convex; size moderately 
large. 
Color. Mottled gray, sometimes blackish. 
Measurements. Total length, 36 to 4o feet. 
15. Megaptera. 
Megaptera Gray, Erebus and Terror, Zodl., 1846, p. 16. Type 
Balena boops Linneus. 
Megapteron Gray, Erebus and Terror, Zodl., 1846, p. 61. 
Kyphobalena Eschr., Nord. Wallth., 1849, p. 56. 
7 
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