2. 8TEN0. 235 



in. 



Length, entire 20| 



Length of nose 13 



Length of lower jaw 17 



Length of symphysis 6i 



Width of notch 3| 



Width at orbit 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 2i inches narrower over the orbit; lower 

 jaw nearly straight below, united for more than one-third its length. 



It may be the same as I), 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 depressed. 



5. Steno attenuatus. The Slender-heahed DolpMn. 



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 ; intermaxiUaries forming a 

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

 middle of palate. Teeth |-g.. 



Delphinus attenuatus, Gray, List Mamm. B. 31, 105. 



Steno attenuatus, Gray, Zool. Ereb. ^ Terror, 43. t. 28 (skull) j Cat, 



Cetac. B. M. 1850, 130 ; Bhjth, Cat. Mus. Asiat. Soc. Bengal, 92 ; 



Asiatic Researches, xii. App. xxvii. ? 



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

 Bengal {BliffK). Mus. CoU. Surg. Edinb. 



a. Skull. Presented by Mrs. Ince. 



6. Skull. The specimen figured in the ' Voyage of the Erebus and 



Terror,' pi. 28. 

 c. SkuU. 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 3 6 



Breadth of middle of beak ..16 17 18 



Breadth of intermaxiUaries 1 1 1 



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

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

 named has the form of D. 31 al ay a 7ms, but beak shorter, and teeth 

 shorter and thinner, very Uke those of D. Delj^his. Palate not 

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



