BAL^NOPTERA — MEGAPTERA. 65 



the cylindriform duodenum, D. Spleen, >S'. Turner in 

 Proc. Roy. ^oc. Edin., vol. xix., 1892. Figure, p. 64. 



25. Brain, two hemispheres of cerebrum, of B. rostrata, 



without membranes. The mesial surface of the 

 right hemisphere is described and figured in Sir 

 Wm. Turner's memoir " On the Convolutions of the 

 Brain," 1890. Jonrn. Anat. and Phys., vol. xxv., 

 1891 ; also in Plate VIII. of Catalogue. 



26. Brain of B. rostrata, partially dissected. 



II. MEGAPTERA. (M.) 



Megaptera, Gray, Zool. Erebus and Terror, p. 16, 1846. 



Low, hump-like dorsal fin ; skin of throat and chest 

 plicated ; tetradactylous. Scapula with coracoid 

 rudimentary and acromion absent. Head moderate. 

 Length 40 to 50 feet. 



(1) Megaptera boops. (M. b.) 



(Hum])-back or Long-armed Whale.) 



Balsena boops, Linn., Syst. Nat, 1766. 



Balsena longiinana, Rudolphi, Mem. Acad. Berlin, 1829. 



Megaptera boops, Van Beneden and Gervais, Osteogr. Get. 



Colour black ; under surface of caudal and pectoral fins 

 white. Pectoral fin narrow, very long, tuberculated 

 on anterior border; dermal tubercles on head. 

 Cervical vertebra? free or partially fused. Vertebral 

 formula C^D^^L^^Coj = 53. 



1. Baleen plates, two, of a Megaptera towed into Wick Bay, 



March 1871. Colour black, bristles stiff; length of 

 plate 25 inches, breadth at base 8 inches. Skeleton 

 not preserved. The animal, a male, was 48 feet long 

 and about the same in girth ; the caudal fin was 

 15 feet from tip to tip; the pectoral limbs were said 

 to be 14 feet long. The specimen was described by 

 Mr W. Reid in Land and Water, 1st April 1871. See 

 Alston's Fauna of Scotland, Glasgow, 1880. 



Turner Collection. 



2. Baleen plate, 21 inches long and 9^ inches in greatest 



width. Colour black, bristles stiff. From a Megaptera 



5 



