14 



W. LlLLJEBORG, 



viz. Balaena Mysticetus Linne, from the N. Polar Seas. Besides this Gray 

 reckons three other species to this genus. Balaena biscayensis Gray, Bal. 

 marginata Gray and? Bal. gibbosa Erxl., of which the first does not, and 

 the 2 nd , which was found in the Western Australian seas, probably does 

 belong to this genus, but is known only by its whiskers, and the third 

 most probably does not really exist. 



2. Genus EUBALAENA, J. Gray. 



Mouthopening , viewed from the side, forming an irregular arch, the 

 back part rising almost perpendicularly. First pair of ribs single at upper 

 and very broad at loner end. Bladebone without processus coracoideus, 

 but with perfect acromion. Intermaxillary bone on the upper side of the cra- 

 nial snout much broader than the upper jaw holies. Number of ribs 15 pairs , 

 and the 2 1 * and sapient anterior pairs somewhat thin and compressed at their 

 lower end. Whiskers provided with several rows of stiff edge-bristles. 



The type of this genus is the Balaena australis Desmoulins, from 

 the seas of Southern Africa. There is moreover a species, Eubal. cisarctica 

 E. D. Cope 1 ), from the ocean on the Eastern coast of the United States, 

 the structure of the skeleton of wich is tolerably well known, and Gray 

 adds another species, Eubal. Sieboldii Gray, from Japan, which however is 

 only known i a Japannese porcelain model. 



3. Genus CAPEREA, J. Gray. 



Skeleton indicates a body similar in form to that of the Eub. au- 

 stralis, and the back part of mouthopening , viewed from the side, is almost 

 perpendicular, buth what particularly distinguishes this genus, is that the bla- 

 debone has only a rudimentary acromion and no coracoide process. First pair 

 of ribs single at upper, and very broad and obliquely and slightly hollowed 

 out at lower end. The form of the cranium seems similar to that af the 

 Eubalaena. All the cervical vertebrae are united together. Number of ver- 

 tebrae 55 — 56. Number of ribs 15 pairs. According to Gray the tymp anal- 

 hone has the form of an irregular oval rhomb, with the opening very small 



') Proceed, of Acad, of Natural Sciences of Philadelphia, 1865. p. 168. Cope 

 expresses the suspicion of the identity of this Whale with the Bal. Biscayensis , hut 

 his description seems to indicate considerable diiferences between them. 



