334 MAMMALIA : CETE. — LL 
581. SIBBALDIUS! 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 (&u.) (Allied to this species is the 
Pacific “Sulphur Bottom,” Szbbaldius 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. BALAINOPTERA Lacépede. (Balcena ; rrepéy, fin.) 
1108. B. rostrata (Miiller). Pikep WHALE. L. 30 feet. N. 
Atl. (Eu.) (Lat., long-nosed.) 
583. MEGAPTERA Gray. (wéyas, large; mrepéy, fin.) 
1109. M. longimana (Rudolphi). Hump-sack 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). Scrac Wuate. N. Atl, a 
rare or very doubtful species, sometimes thought to be the young 
of the Right Whale. (£u.) 
585. BALZINA Linneus, (Lat., whale.) 
1111. B. cisarctica Cope. Rigut Wuate. Buiack 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, 
' According to Professor Cope, this genus is a doubtful one, S. tectirostris being 
perhaps not really different from Balenoptera (Physalus) physalus. 
Probably Physalus and Sibbaldius should be united to Balenoptera, (True.) 
