7. SIBBALDIUS. 



171 



jaws slightly curved and scarcely wider than the edge of the upper 

 ones. Pectoral fin one-eighth of the entire length, and rather more 

 than one-third, and the dorsal nearly three-fourths, from the nose. 



The length was 31 feet 1 inch, from nose to the eye 2 feet 9 inches, 

 to blower 3 feet 11 inches, to pectoral 3 feet 6| inches, to the front 

 of the dorsal 19 feet 2 inches, to the vent 21 feet. 



Balfena rostrata, Rtidolphi, Bed. Abhandl. 1820, t. 1 Tnot Hunter) ; 



Brnndt i^f Ratzeb. Med. Zool. i. 119. t. 15. f. 3, t. 16. f. 12 ; Gray, Cat. 



Cetac. B. M. 

 Rorqual du Nord, Cuvier, Oss. Foss. v. 5G4. t. 26. f. 6 (copied from 



BudolpJii). 

 BalfBnoptera laticeps, Gray, Zool. E. 8f T. (from Rudolphi) ; Cat. 



Cetac. B. M. 37. 

 Balsena borealis (part.), Fischer, Syn. 524 (from Cuvier). 

 Balsena Physalus (part.), ISiihson, Scand. Fauna, 635. 

 Pterobalsena Boops (part.), Eschricht, K. Dansk. Vid. Selsk. 1849, 



130, 131. 

 Baljenoptera borealis (part.), Rapp, Cetac. 51. 



Inhab. North Sea. Holstein, 1819 (EudoJpJd) ; skeleton in Mus. 

 Berlin, 31 feet long. Zuyder Zee, 1816, skeleton in Mus. Leyden. 



Fig. 38. 



First rib of Sibhaldius laticeps. (From Rudolphi.) 



The blade-bones with an elongated coracoid process, bent up to- 

 wards the upper edge of the bone, and oidy a very rudimentary 

 acromion ; the upper edge arched ; the ends acute, the hinder one 

 rather produced. The forearm-bones are slender, rather dilated at 

 each end, more than twice the length of the short thick humerus ; 

 the ulna with a rounded dilatation on the upper end (olecranon). 

 Fingers 4, moderately long ; the two middle longest, subequal, each 

 of seven joints ; the first shorter, of four joints ; and the fourth 

 shorter still, of three joints. — Rudolphi, t. 1. f. 1. 



Entire length 31 feet 1 inch. Length from nose to front of eye 

 5 feet 3 inches, to pectoral fin 9 feet, to dorsal fin 19 feet 2 inches, 

 to vent 21 feet ; length of pectoral fin 3 feet 6 inches, breadth of 

 pectoral fin 8 inches. 



The OS hyoides broader in the middle, the end rather tapering and 

 bent up towards the front, the middle of the hinder edge produced 

 out into broad rounded lobes (see Rudolphi, t. 4. f. 1, 2). The tym- 

 panic bones are short, oblong, swollen ; they are figured in situ in 

 the skull (Rudolphi, I. c. t. 3. f. 6). Dorsal fin two-thirds of the 



