CETACEA. 127 



Var. 1. Skull in Mus. Coll. Surg. Edin. n. 164. Barclay Col- 

 lection. Head smaller, and the nose rather shorter, only 1 J the 

 length of the brain-cavity, but quite as long as compared with 

 the width of the notch/ Length, entire, 16'6, of beak KH> ; 

 width at notch 3*0; triangle to the teeth-line rugose. Nose 

 groove open in front. Teeth ^-g-, small, curved. 



This skull resembles SchlegePs figure of the skull of D. longi- 

 rostris in general form, but the beak is rather more slender, and 

 the orbits more obliquely truncated in front. 



14. STENO. 



Head convex. Forehead convex. Beak moderate, tapering. 

 Body elongate, fusiform. Pectoral fin moderate, ovate, falcate. 

 Dorsal falcate, in the middle of the back. Skull round, sub- 

 globular. Forehead erect. Beak elongate, compressed, higher 

 than broad, tapering in front, convex above. Triangle elongate, 

 deep, produced rather beyond the teeth-line. Palate convex, not 

 grooved on the side. Lower jaw elongate, compressed in front ; 

 symphysis elongate, about J the length. 



Steno, Gray, Zool. Erebus fy Terror, 43, 1847. 

 Delphinus, sp. Cuvier ; SMegel. 



This genus is at once known from Lagenorhynchus and Del- 

 phinus by the length, compression, and tapering form of the beak 

 of the skull. 



The foetus of Steno fuscus is very peculiar for the elongated 

 tapering head ; the pectoral fins are rather large, strongly falcate ; 

 the dorsal rather beyond the middle of the back. Its tongue is 

 flat on the top, and nearly as broad as the space between the sides 

 of the jaws ; it is entire on the edges of the sides, and slightly 

 dilated in front, crenulated on the edge, and with a larger flat 

 lobe in the middle of the tip. See Zool. Erebus fy Terror, t. 26. 

 f. 1, a, b, c. 



* Beak separated from the forehead by a cross groove. 



1. STENO MALAYANUS. The MALAY DOLPHIN. 



Grey-ash above and below ; nose of skull about f of the entire 

 length; teeth ff. 



Delphinus Malay anus, Lesson, Voy. Coq. t. 9. f. 5 ; Hist. Cetac. 



152 ; Schlegel, Abh. i. 1. 1, 2. f. 2. t. 4. f. 3. 

 D. Capensis, Rapp. Cetac. t. 2. f. 1, not Gray nor Cuv. 

 D. Rappii, Reichb. Cetac. iii. 48. 1. 18. f. 5, /. 



