160 BULLETIN 36, UNITED STATES NATIONAL MUSEUM. 



Teeth ;■. Vertebrje., C. 7 ; 1). 12 ; L. IG; Ca. 20 = 01. Skull as in T. 

 catalania, but narrower across the orbits and with the beak narrower 

 at its base. 



Measurements of the exterior (from Riippell). — 9 adult. Total lengtL, 

 70.4 inches (194.9'=>") ; tip of snout to eye, 11.0 inches (29.7'^^'") ; to dorsal 

 tin, 35 inches (SO.S*""') ; vertical height of dorsal fin, 8.5 inches (21.0'^^"') ; 

 breadth of Hukes, 20.2 inches (51.4'^'"). 



Measurements of the sl-ull. — (Type.) Total length, 40""; length of 

 rostrum, 27"" ; breadth of rostrum at its base, 9.2'^^"' ; breadth of iuter- 

 maxillai at same point, 3.4'^^™ ; breadth between orbits, 18.7"". 



Habitat. — Red Sea. 



TURSIOPS GILLII Ball, 

 r Plato 10, figs. 1 and 2.) 



Exterior known only from an outline drawing and record of two 

 "momentary observations" by Scammon. 



In general form similar to T. tursio. Color "black all over, lightened 

 a little below." 



Teeth ^.i Skull like that of T. tursio in form and size. Condyles of 

 the mandible large, their greatest diameter contained twice in the 

 greatest depth of the ramus. Optic canal not rising to the level of the 

 inferior surface of the frontal bone, which is deeply concave in front of 

 it. Lower end of visible portion of parietal a uarrowish band, between 

 the squamosal and a backward prolongation of the frontal. 



Measurements of the skull. — Total length, 51""'; length of rostrum, 

 29.8<="'; breadth of rostrum at its base, 14.1'"'; at its middle, S.S"'", 

 breadth between orbits, 24.5*'"'; length of temporal fossa, 13.5*^^"'. 



Habitat. — ISTorth Pacific Ocean : Monterey, Cal., and Lower California. 

 {[J. S. National Museum.) 



4. DELPHINUS Linne. 



Palate with tw^o deep lateral grooves. Rostrum long and narrow. 

 Pterygoid bones normal, in contact. Symphysis of mandible short. 

 Teeth small, acutely pointed, and numerous, 47 to 05. Veriebra', 73 

 to 70. 



Bead with a distinct long beak. Dorsal and pectoral fins falcate, 

 moderate. Color black above, lighter below, with several conspicuous 

 longitudinal bauds. 



DELPHINUS DELPIIIS Liim<S. 

 (Plate 11, figs. !/,>, and :3.) 



Body slender; forehead sloping gradually, forming a wide angle with 

 the beak ; beak long and slender (average about one fourteenth the 

 total length) ; dorsal fin in the middle of the median dorsal line, narrow, 

 and not strongly recurved above, its vertical height about one-ninth 



