228 DR. J. E. GRAY ON BRITISH CETACEA. [May 24, 
B. musculus, part, et B. hoops, part, Fleming, B. A. 30, 31. 
B. musculus, part, Jenyns, Man. 47. 
B. boops, Giesecke, Edin. Encyl.; Newman, Zool. i. 33, fig. ; 
‘Turner, Cat. Ost. Mus. Col. Surg. n. 1194 (Hunter’s spec.?). North 
Sea. 
B. minimus borealis, Knox, Cat. Whale, 1. 
Rorqualus minor, Knox, Jard. Nat. Lib. 142. 7; Gaimard, Voy. 
Iceland, Mam. t. 13 (skeleton) ; t. 14 (skull). 
Balenoptera boops, part, Fleming, B. A. 31; Bell, B. Quad. 520, 
fig. p. 521 (from Hunter). 
Hab. Ascending the mouth of rivers; Thames at Deptford 
(Hunter), skeleton in Mus. Coll. Surg.; Frith of Forth, near 
Queensferry, 1834 (Knox); Cromer (Gurney), skeleton in Mus. 
Coll. Surg.; Thames opposite Deptford Creek, Oct. 23, 1842 
(Illustrated London News, i. 388; Zoologist, 1842), skeleton in 
British Museum; Jutland, 1837, skeleton in Mus. Louvain; ske- 
leton Mus. Bremen, head figured by P. Camper ; Bergens, skeleton 
Mus. Paris, Charante. 
The student must not run away with the idea that, because the 
characters of the genera here given are taken from a few parts of the 
skeleton, they are the only differences that exist between the skele- 
tons of the different genera and species. The form of the head and 
the peculiarities of the cervical vertebree of the ribs and of the 
bladebone have been selected after a long and careful comparison of 
the skeletons, as the parts which afford the most striking characters, 
that can be most easily conveyed to the mind of the student in a few 
words, and therefore best adapted for the distinction of the genera 
and species. 
Fig. 20. 
Atlas Vertebra of Balenoptera rostrata. 
Extreme width 9 inches; height 94 inches. 
