350 Dr. J. E. Gray on the Whalebone-Whales. 



Fam. 2. Balaenopteridse. (The Finners.) 



Belly longitudinally 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 vertebra! 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- 

 tebrae 54 or 55. 



a. Blade-bones without any acromion or coracoid process ; the bodies of the 



cervical vertebree suhcircular ; arm-bones broad. (Megaptera.) 



1. Megaptera longimana, Gray. 



Balcena longimana, Riulolplii. 



Hah. North Sea. Skeletons in British Museum and Liverpool. 



b. Blade-bone with a small coracoid process ; the bodies of the cervical ver- 



tebne nearly square, with the angles rounded. (Poescopia.) 



2. Megaptera Lalandii, Gray, Proc. Zool. Soc. 1864, p. 207. 



Balana Lalandii, Fischer. 

 Balcena Posscop, Desmoul. 



Hab. Cape of Good Hope. Skeleton, Mus. Paris; cervical 

 vertebrae, Brit. Mus. 



c. Blade-bone with a distinct acromion and coracoid process ; arm-bones 

 more slender j fingers ? (Eschrichtius). 



3. Megaptera ? robust a. 



Balcenoptera robusta, Lilljeborg, Fordrag, Kjobenh. 1860, p. 602. fig. 1 ; 

 Scand. Hvaldjur. p. 77- 



The coronoid process of the lower jaw low, but little developed. 

 Kibs 15.15, the first three with a small compressed process 

 below the condyle. Vertebrae 60 ; the lateral processes of the 

 hinder cervical vertebrae 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. 



