80 BAriENID^. 



ture oblong, only slightly contracted at the upper end, and about 

 two- thirds the length of the bone ; orbits small (see Cuvier, Oss. Poss, 

 V. t. 25. f. 9, 10, 11). Baleen narrow, elongate, very gradually 

 tapering, tough, flexible ; enamel thick ; internal fibres few, in a 

 single series, very slender, forming a beautiful thin flaccid fringe^ 

 Cervical and the first dorsal vertebrae united by their bodies (see 

 Cuv. Oss. Foss. V. 380. t. 26. f. 18). Blade-bone about as high 

 as broad, with a broad acromion (Cuv. t. 26. f. 8). Pelvis of three 

 bones. 



Fig. 2. 



Balsena Mysticetus, foetal. Eschr. Nord. Hvaler, t. 3. f. 1. 



The frontal bone short, broad, and band-like, obliquely truncated 

 over the orbit. The upper maxillary bone and intermaxUlaries are 

 very narrow, linear. The nasal rather large. The lower jaw is 

 thick and rounded, with scarcely any ramus near the base (Eschr. & 

 Reinh. Nord. Hvaler, t. 5. f. 1). Humerus short ; fore-arm bones 

 nearly twice as long as the humerus. The pectoral fin moderate, 

 with five short unequal fingers, and a short spur on the inner side at 

 the base of the first finger; the middle finger longest, then the 

 second, then the first ; the outer or little finger very short and rudi- 

 mentary (see Eschr. & Reinh. op. cit. t. 2. f. 1, & fig. p. 578). Pha- 

 langes 3.4.4.4.1. 



The cervical vertebrae of the adult are all anchylosed together by 

 the body. The neural arch and the lateral processes, and sometimes 

 the first and even the second dorsal, are anchylosed with them. In 

 the young the first five cervical vertebrae are united into a mass by 

 the bodies ; the sixth free, with rudimentary inferior lateral processes ; 

 the seventh free, without any inferior process (see Eschr. & Eeinh. 

 op. cit. t. 2. f. 3, & fig. p. 552). 



The blade-bone three-sided, nearly equal-sided, as high as wide at 

 the upper edge, with a small anterior coracoid process (see Eschr. & 

 Eeinh. op. cit. t. 2. f. 1, & fig. p. 574). 



The first rib narrow above, with a single head, and without any 

 internal dilatation, rather broader at the end near the sternum, and 

 rounded at the end. The second rib is simple, rather longer, and 



