TURSIOPS. 135 



dorsum ; venter greyish white and white. Palate 

 not raised mesially into a ridge nor grooved laterally. 

 Vomer visible in middle line of palate. 



(1) TURSIOPS TURSIO. (T. T.) 

 (Common Tursio.) 

 Delphinus tursio, Fabricms, Fauna Grcenl., 1780. 

 Tursio truncatus, Gray, Cat. Seals and Whales, 1866. 



Colour leaden grey generally, white ventrally ; length 

 up to 10 feet ; dorsal tin high, falcate, about middle 

 of length ; pectoral limb slightly falcate ; vertebral 

 formula C^D^gL^^Cdgy = 64. Teeth fewer and stronger 

 than in D. delphis. 



1. Skull, adult, with mandible; length 21^ inches; breadth 



10|^ inches. Beak, length 12^ inches; breadth at 



base 5| inches, about middle 3^ inches. Nasals, 



frontal and transverse ridge on vertex on same 



plane ; premaxillae concave in front of nares, then 



convex to the somewhat pointed tip ; pterygoids 



moderate, meeting mesially. Length of mandible 18^ 



inches. Length of symphysis 3^ inches. Teeth 



, , 24 24 



moderate, worn, ^ ^ . 



Loch Long, 1879. Donor— Dr D. Noel Paton. 



2. Skull, with mandible, from a younger animal ; length 18 



inches, breadth 9^ inches. Beak, length 10 inches; 

 breadth at base 4i inches. General characters as in 



22 22 



No. 1. Teeth moderate, sharp, ^ ^ . 



Delny, Ross-shire, 1898. 



Donor — Wm. Taylor, Esq., Lhanbryde. 



3. Mandible, length 16 inches, greatest height 3^ inches, 



symphysis If inch. Teeth absent, but twenty sockets 

 in each half. 

 Barbados. Donor — Dr F. B. Archer. 



4. Tympano-periotic bones, pair of ; tympanic, length 1^ inch, 



breadth 1 inch; periotic, length If inch; breadth f 

 inch. Tympanic bilobed, with wide notch intervening; 

 outer lobe rounded and smooth, inner lobe flattened, 

 rough, and continued into a rough ridge which 

 separates the internal from the inferior surfaces. 

 Outer surface convex anteriorly, flattened behind the 



