42 DR. J. E. GRAY ON A NEW WHALE. [Jan. 10, 
The large size of this canal in Megaptera, Peescopia, and Cuvierius, 
as well as peculiarities in other parts of the skeleton in the two 
former genera, shows that the long-armed Humpbacked Whales 
have some characters which make them, in some respects, more 
allied to the Right Whales, or Balenide, than the other Finner 
Whales. schrichtius is separated from both Megaptera and Pes- 
copia by the regular and well-developed form of the lateral pro- 
cesses, which are even larger and longer, compared with the size of 
the body of the vertebra, than are found in any of the species of 
Physalus or Benedenia. 
The canal of the spinal marrow in Eschrichtius is broader, com- 
pared with the size of the body of the vertebree, than it is in the last 
cervical vertebra of Balena biscayensis (the canal in this species 
becomes wider, compared with its height, as it approaches the dorsal 
vertebra) ; for its width is only four-fifths of the width of the body 
of the vertebra, while in Eschrichtius it is eight-eighths of the same 
measurement, 
In the study of these animals, I have observed that the form and 
proportion of the canal of the spinal marrow constitute one of the best 
characters for the distinction of the Whales. Under these circum- 
stances, I propose to form a genus for this Whale, under the name 
EscuricHrTivus. 
The external form and size of pectoral fin, and the position and 
form of the dorsal fin, unknown. Lower jaw with a very low, 
strongly developed coronoid process. Vertebree 60. Ribs 15—15. 
The cervical vertebre free, the body small, thick, suborbicular, qua- 
drangular, rather wider than high ; lateral processes of the third to 
the seventh vertebrae not forming a ring; the canal of the spinal 
marrow very broad, compared with the width of the body of the 
vertebrze, and very high, subtrigonal, with rounded angles. The 
second cervical not known. Bladebone with a distinct acromium and 
Vertebra of Eschrichtius robustus. 
coracoid process. Arm-bones broad, not longer than the humerus. 
Fingers, phalanges half as long again as broad. The breastbone 
