2. siENO. .235 



ink 



Length, entire 20| 



Length of nose 13 



Length of lower jaw 17 



Length of symphysis 6J 



Width of notch 3^ 



Width at orhit 6| 



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 one-third its length. 



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

 numerous ; and Cnvier'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 depressed. 



5. Steno attenuatus. The Slender-beaJced Dolphin. 



Nose of skull three-fifths the entire length, once and a half the 

 length of the skull, twice and three-fourths the length of the width 

 of the notch, slender, tapering in front ; intermasiUaries forming a 

 long triangular part of the front of the palate ; vomer elongate, in 

 middle of palate. Teeth fj. 



Delphinus attenuatus, Gray, Idst Mamm. B. M. 105. 



Steno attenuatus, Gray, Zool. Ereb. §■ Terror, 43. t. 28 (skuU) ; Cat. 



Cetae. B. M. 1850, 180; Blyth, Cat. Mm. Asiat. Soe. Bengal, 92; 



Asiatic Researches, xii. App. xxvii. ? 



Inhab. Cape Horn. Sea west of Cape of Good Hope and Bay of 

 Bengal (Blyth). Mus. Coll. Surg. Edinb. 



a. SkuH. 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 in the British Museum : — 



a. b. c. 



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



Length, entire 15 9- 16 6 15 6 



Length of nose 8 9 10 9 3 



Length of lower jaw 13 3 .... 13 



Breadth of temples 60 65 61 



Breadth of notch 33 33 36 



Breadth of middle of beak . . 16 17 18 



Breadth of intermaxillaries 1 1 1 



Delphinus pseudodelphis, Wiegm. Schreb. t. 358 (skull) ; Eeiohb. 

 Cetac. Anat. t. 18. Teeth A| or ||. " Skull in Mus. Leyden so 

 named has the form of D. Malayanus, 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 



