188 BAL^JfOPTEEID^. 



Eschricht figured the cranium of a B. rostrata from a foetus 

 9 inches long, an older foetus Gi feet long, and an older specimen 

 31 feet long (t. 9, t. 10, 1. 11, & t. 14), which show how much more 

 rapidly the rostrum elongates in comparison with the size of the 

 brain-case, the very unequal manner in which the bones enlarge as 

 compared with each other, and how they anchylose, especially the 

 very large size of the tympanic bones in the smallest foetus com- 

 pared wdth these bones in the older specimen, and how they enlarge 

 laterally and become more transverse and less oblique as the animal 

 increases in size. In the foetal state the forearm-bones are slender 

 and nearly t-nace as long as the humerus ; the longest fingers are 

 almost as long as the forearm-bones ; the second and third and the 

 first and fourth fingers are nearly equal in length ; the first finger 

 has three, the second and third six or seven, and the fourth four 

 phalanges. — Eschricht, Wallthiere, t, 7. f. d, D. 



1. Balaenoptera rostrata. The Pil-e Whale. 



Black, beneath reddish white. Pectoral fin white near the base 

 above. 



Bala3na rostrata, Midler, Prodr. ; O. Fahr. Faun. Grcenl. 40 ; Hunter, 



Phil. Tram. Ixxvii. t. 20-23, cop. E. M.t.4:; Turton, B. 1 auna, 16 ; 



Nilsson, Scand. Fauna, 632. 

 Korqualus rostratus, Dekai/, Zool. New York Mus. 730, t. 30. f. 1. 

 Balfena musculus (pars), Flem. B. A. 30 ; Jenyns, 3Ian. 47. 

 Baltena Boops (pars), Flem. B. A. 31. 

 Balaenoptera acuto-rostrata, Lacep. Cetac. ; Scoresby, Arct. Reg. i, 485. 



1. 13. f. 2. 

 Balcenoptera acuto-rostrata, Lesson, N. T. B. A. 202. 

 Balaenoptera microcephala, Brandt, 3ISS. 

 Balaena minimus borealis, Fjiox, Cat. Whale, 14. 

 llorqualus minor, Knox, Jardine, Nat. Lib. 142. t. 7 ; Gaimard, Voy. 



Islande, Mamm. t. 13 (skuU), t. 14 (skull). 

 Balaena borealis rostrata, Fischer, Syn. s. 25. 

 Balaena Boops, Albers, Icon. Anat. 1822, t. 1 ; Catnper, Cetac. 74. t. 11, 



12 ; Cat. Coll. Surg. 171. n. 1194, Ifimter's sjjec. ? ; Giesecke, Edinb. 



Encyclop. 

 Balaenoptera Boops, Fin -backed Whale, Neicman, Zoohqist, i. 33, fig. ; 



Fleming, B. A. 31 ; Bell, Brit. Quad. 520. fig. p. 521,' from Hunter. 

 Rorquahis Boops, F. Cuv. Cetac. 321. t. 20. 

 Balaenoptera Pliysalus, Gray, Zool. E. S,- T. 18. 

 Vaagehval, Eschricht, K. D. Vidensk. Selsk. xi. 1. 1, 2, and p. 286-299 



(fetus and anat.). 

 Balajnoptera rostrata. Gray, Zool. Ereb. ^- Terror, 50. t. 2 (skull), 



t. 1. f. 3 (baleen) ; Proc. Zool. Soc. 1847, 90 ; Cat. Cetac. B. M. 



1850, 32; Proc. Zool. Soc. 1864, 227 ; Floicer, Proc. Zool. Soc. 1864 



(anat.). 

 Pterobalaena minor, Eschricht, Nord. Wallthiere, 59, 1849 ; Van Beneden, 



Mhn. Acad. Roy. Bru.velles, xxxii. 36 ; Couch, Rep. Nat. Hist. Soc. 



Penzance, 1851 ; LilJjeborg, I. c. ; Mahngren, Arch. Nattirg. 1864. 

 Pterobalfena minor et prostrata. Van Beneden, I. c. 463. 



Inhab. North Sea. Ascending the mouths of rivers. New York 

 Bay (2>f^-«7/). Yalognes, France (CrVo^Vo^). Greenland. Norway. 



