334 MAMMALIA: CETE. LI. 



581. SIBBALDIUS 1 Gray. (To Robert Sibbald, who de- 

 scribed the whales of Scotland in 1773.) 



1105. S. borealis (Cuvier). SILVER-BOTTOM WHALE. Steel 

 gray. L. 90 feet. N. Atl. (Eu.) (Allied to this species is the 

 Pacific " Sulphur Bottom," Sibbaldius sulfureus Cope, the largest 

 of all animals, reaching a length of more than 100 feet.) 



1106. S. tuberosus Cope. Back with a series of humps or 

 tuberosities along the median line from dorsal to tail ; uniform 

 black above ; P. without band. L. 40 to 50 feet. N. Atl. 



1107. S. tectirostris Cope. FIN-BACK WHALE. L. 60 feet. 

 Coast of E. U. S., the most common large whale in Mass. Bay. 

 (Lat., tectus, covered ; rostrum, snout.) 



582. BAKS-iNOFTERA Lacepede. (Balcena ; irrcpov, fin.) 



1108. B. rostrata (Miiller). PIKED WHALE. L. 30 feet. N. 

 Atl. (Eu.) (Lat., long-nosed.) 



583. MEGAPTERA Gray, (peyas, large ; nrepdi/, fin.) 



1109. M. longimana (Rudolphi). HUMP-BACK WHALE. Body 

 short, thick, with humps and protuberances ; skin often covered 

 with barnacles. L. 50 to 75 feet; color usually black. N. Atl., 

 formerly common. An American form has been described as M. 

 osphyia Cope, on account of the shorter head and fins, and higher 

 neural spines. (Eu.} (Lat., longus, long ; manus, hand.) 



584. AGAPHELUS Cope. 



1110. A. gibbosus (Erxleben). SCRAG WHALE. N. Atl., a 

 rare or very doubtful species, sometimes thought to be the young 

 of the Right Whale. (Eu.) 



585. BAL^JNA Linnaeus. (Lat., whale.) 



1111. B. cisarctica Cope. RIGHT WHALE. BLACK WHALE. 

 The common large whale of our Eastern coasts and the North 

 Atlantic generally, occasionally S. to S. C. Color black. L. 40 

 feet. (Eu.) (Lat., this side of Arctic.) (B. biscayensis Gervais, 

 the American name older.) 



In the Arctic seas occurs the great Bowhead, B. mysticetus L., 

 the most valuable of the whales, reaching a length of 50 or 60 feet, 

 yielding 200 to 300 barrels of oil and from 1 to 2 tons of whale- 

 bone. 



1 According to Professor Cope, this genus is a doubtful one, S. tectirostris being 

 perhaps not really different from Balcenoptera (Physalus) physalus. 



Pruuubiy Pkysalus and Sibbaldius should be united to BaUenoptera. (True.) 



