350 Dr. J. E. Gray on the Whalebone-Whales. 
Fam. 2. Balenopteride. (The Finners.) 
Belly longitudially plaited. Dorsal fin distinct ; pectoral 
fin lanceolate. Maxillary bones expanded. The baleen short, 
broad, triangular, twisted. The tympanic bones oblong ovate. 
Scapula broader than high. 
A. The Hunchbacked Whales have a very low broad dorsal, a very long 
pectoral fin ; arm-bones strong, broad ; fingers very long, joints 3 to 
10; the cervical vertebre are often anchylosed ; the neural canal high, 
triangular, with angles rounded, as high as broad. 
1. MEGAPTERA. 
The pectoral fin about one-fifth of the entire length of the 
animal. The second cervical vertebra with two short, truncated, 
subequal lateral processes. Ribs 14; first single-headed. Ver- 
tebree 54 or 55. 
a. Blade-bones without any acromion or coracoid process ; the bodies of the 
cervical vertebre subcircular ; arm-bones broad. (Megaptera.) 
1. Megaptera longimana, Gray. 
Balena longimana, Rudolphi. 
Hab. North Sea. Skeletons in British Museum and Liverpool. 
b. Blade-bone with a small coracoid process ; the bodies of the cervical ver- 
tebre nearly square, with the angles rounded. (Poescopia.) 
2. Megaptera Lalandii, Gray, Proce. Zool. Soc. 1864, p. 207. 
Balena Lalandii, Fischer. 
Balena Pescop, Desmoul. 
Hab. Cape of Good Hope. Skeleton, Mus. Paris; cervical 
vertebre, Brit. Mus. : 
ce. Blade-bone with a distinct acromion and coracoid process ; arm-bones 
more slender ; fingers ? (Eschrichtius). 
3. Megaptera? robusta. 
Balenoptera robusta, Lilljeborg, Fordrag, Kjobenh. 1860, p. 602. fig. 1; 
Seand. Hvaldjur. p. 77. 
The coronoid process of the lower jaw low, but little developed. 
Ribs 15.15, the first three with a small compressed process 
below the condyle. Vertebree 60; the lateral processes of the 
hinder cervical vertebre free at the end, the lower ones longest, 
bent up and dilated at the end. 
Hab. Northern Sea. 
The skeleton was found buried in the sand, in an imperfect 
condition. The form of the dorsal and pectoral fins, and many 
of the more characteristic bones, as the second cervical vertebra, 
are not known. 
