130 CETACEA. 



The skulls of this species are easily known from the former 

 by being much more slender and more attenuated in front, and 

 by the head, though longer, being 2 inches narrower over the 

 orbit ; lower jaw nearly straight below, united for more than -| its 

 length. 



It may be the same as D. rostratus, but the teeth are more 

 numerous ; and Cuvier's figure, which he thought might be 

 Breda's species, certainly much better represents a common 

 Indian species than this. 



In one of the skulls the nose is rather shorter and more de- 

 pressed. 



4. STENO ATTENUATUS. The SLENDER-BEAKED DOLPHIN. 



Nose of skull f of entire length, 1| the length of the skull, 

 2f the length of the width of the notch, slender, tapering in 

 front ; intermaxillaries forming a long triangular part of the front 

 of the palate; vomer elongate, in middle of palate; teeth f$. 



Delphinus attenuatus, Gray, List Mam. B. M. 105. 



Steno attenuatus, Gray, ZooL Ereb. $ Terror, 43. t. 28, skull. 



Inhab. Cape Horn. Mus. Coll. Surg. Edinb. 



a. Skull. Presented by Mrs. Ince. 



b. Skull. 



The specimen figured in the Voyage of the Erebus and Terror, 

 pi. 28. 



c. Skull. 9 N. lat. Presented by A. Pearson, Esq. 



Measurement of the three skulls : 



a. b. c. 



in. lin. in. lin. in. lin. 



Length, entire 15 9 16 6 15 6 



of nose 89 10 93 



of lower jaw 13 3 13 



Breadth of temples 60 65 61 



of notch 33 33 36 



of middle of beak 16 17 18 



of intermaxillaries 01 01 01 



Delphinus pseudodelphis, Wiegm. Schreb. t. 358, skull ; Reichb. 

 Cetac. Anat. 1. 18. Teeth f f or f f. Skull in Mus. Leyden 

 the form of D. Malay anus, but beak shorter, and teeth shorter 

 and thinner, very like those of D. Delphis. Palate not grooved. 

 Symphysis of lower jaw rather long." May be the same as the 

 Steno attenuatus, but the Museum copy of Schreber does not 

 contain the plate referred to. 



