NEOBAL^ENA — RACHIANECTES. 31 



divided into two ; tympanic ossicles absent. A large 

 mastoid for articulation with temporal. Whale about 

 40 feet long. Captured, 1910, west of St Kilda. 



Donor— W. Eagle Clark, Esq. 



2. Skull and Earbones. >SV^ Addenda. 



II. NEOBALiENA. (N.B.) 



Neobalsena, Gray, Suppl. Cat. Whales and Seals, 1871. 



About 20 feet long, small falcate dorsal fin; tetra- 

 dactylous. Scapula with coracoid and acromion. 



(1) Neobal^ena marginata. (N.B. m.) 

 Neobala^na marginata, Gray, ut supra. 



Balsena marginata, Gray, op. clt.; Hector, Trans. N. Zealand 

 l7iM., 1869. 



Seventeen pairs of broad, flattened ribs. Vertebral 

 formula C^Di^LgCd.g = 43. 



1. Baleen, two plates, 27 1 inches long; greatest widtli at 



base, 2| inches ; bristles very fine ; colour, black band 



on outer straight border, elsewhere white. Sir J. 



Hector in Proc. N. Zeala^nd Inst., 1869. 



Island of Kawau ; from Colonial Museum, New Zealand. 



Donor — Sir James Hector, K.C.M.G. 



III. RACHIANECTES. (R.H.) 



Rachianectes, Cope, Proc. Acad. Nat. Sc. Philadelphia, 1869. 



No proper dorsal fin, only two folds on skin of throat ; 

 pectoral fin narrow. 



(1) Rachianectes glaucu.s. (R.H. g.) 



(Pacific Grey Whale.) 



Agaphelus glaucus. Cope, Proc. Acad. Nat. Sc. Philadelphia, 

 1868. 



Colour mottled grey to black ; head small ; length 40 

 to 45 feet ; baleen light-coloured, approaching white, 

 less than 2 feet long ; ribs fourteen pairs ; sternum 

 cruciform. The only species. 



No specimen in Museum. 



