138 SPECIMENS OF CETACEA. 



goids united mesially ; symphysis 2f inches long. 



40 40 



Teeth small, acute, ^ ,j^. Locality not specified. 



4. Skull, adult, with mandible. Length 14] inches, breadth 



6| inches ; beak, length 8 inches, breadth at base 3| 

 inches. Nasals in plane of vertex cranii ; premaxillaj 

 with shallow concavity to about middle of beak, then 

 flattened ; hard palate showing vomer in middle line, 

 pterygoids broken ; symphysis of mandible 1^ inch 



31 31 



long. Teeth small, acute, ^ ^. Localit}' not 



specified. Donor — Mr Brotherston. Kelso. 



[Many species have been included in the genus Pro- 

 delphinus : F. W. True names twenty -three, several 

 of which are founded on single skulls and without 

 doubt will need revision. I have placed four skulls 

 in the Museum in this genus, and I have examined 

 one in Mr W. Taylor's Collection which he regards 

 as belonging to it. These skulls have the character 

 of Prodelphinus, but differ in some features from 

 each other, and may be arranged in two groups ; in 

 the one the skull is longer and wider, the beak is 

 somewhat broader in relation to its length, and 

 the premaxillaries are more convex and distinctly 

 broader in the beak than in the other. These 

 characters might be regarded as specific, but with 

 the paucity of material for comparison at my disposal 

 I am not prepared to apply to these skulls specific 

 names.] 



5. Mandible. Length 13^ inches, greatest height 2| inches; 



sympliysis, length of, 1| inch. Teeth 35 in each 

 half, small, acute. 

 Barbados, 1869. Donor — Dr F. B Archer. 



XV. STENO. (St.) 



Steno, Gray, Zool. Erebus and Terror, 1846. 



Colour black on dorsum, white on venter. Dorsal fin 

 falcate. Beak long, compressed, marked off" from 

 forehead. Symphysis of mandible long. Teeth 

 moderate, crowns faintly ridged, 20 to 27 in each 

 half of jaws. 



