588 DELPHINIDJE. 



395. Delphinus dussumieri. The Indian long-nosed Dolphin. 



Delphinus longirostris, Dussumier, Cur. Rcane An. ed. 2, i, p. 288 

 (1829) ; Flower, P. Z. S. 1883, p. 503 ; True, Delphfmdes, pp. 58, 

 161, pi. xii, fig. 2 : W. Sclater, Cat. p. 322 [nee Gray, Sr>ic. Zool. p. 1 

 (1828)]. 



Colour and other external characters unknown. 



Teeth ~. Eostrum greatly elongate. Symphysis of mandible 

 one fifth the length of the skull. Palatal grooves as in D. del- 

 phis. 



Dimensions. Length of skull 19'5 inches, breadth between orbits 

 5* 75, length of rostrum 13*25. 



Distribution. Malabar coast. 



The description of the type skull is copied from True. The 

 name longirostris cannot stand, as there is a different species to 

 which the name was previously given by Gray, D. capensis, Gray, 

 I find, on examining the skull, is quite distinct, having only ^ rather 

 large teeth and a much shorter mandibular symphysis. 



D. roseiventris may also occur in Indian seas. It is known from the 

 Moluccas and Torres Straits, and is a small species, rather less than 

 4 feet long, with || teeth, and the bony palate intermediate in form 

 between that of typical dolphins like D. delphis and that of aber- 

 rant types like D. malayanus. 



396. Delphinus malayanus. The Malay Dolphin. 



Delphinus malayanus, Lesson, Toy. Coquille,Zool.\,^. 184, Atlas, 



pi. ix, fig. 5 (1826). 

 ? Delphinus velox, Dussum.. Cuv. Regne An. ed. 2, i, p. 288 (1829) ; 



F. Cuv. Hist. Nat. Mam. pi. 425 ; Pucheran, Rev. Mag. Zool. 1856, 



p. 453. 

 Steuo attenuates, Gray, Zool. Ereb. $ Terror, p. 44 (1846) ; id. Cat. 



Seals % Whales B. M. 1866, p. 235 ; Blyth, J. A. S. B. xxviii, 



p. 492, footnote ; id. Cat. p. 92. 

 Prodelphinus attenuatus, Flower, List Cetacea B. M. 1885, p. 30 : 



W. Sclater, Cat. p. 324. 

 Prodelphinus malayanus, True, Delphinidce, pp. 67, 165, pi. xvi, figs. 



1, 2. 



Teeth about ^ No lateral grooves on bony palate. 



Colour uniform ashy grey. 



Dimensions. Total length 6 ft. 3 in., height of dorsal fin 8-5 inches, 

 length of pectoral 13-8, expanse of tail 24. A skull is 15-5 inches 

 long, 6 broad across the orbits ; length of rostrum 9-5. 



Distribution. Indian Ocean, obtained in the Bay of Bengal near 

 the Sundarbans. 



There is much confusion regarding Delphinus malayanus, D. atten- 

 uatus, and D. frcenatus (D. doris, Gray), all of which have been re- 

 ported from the Indian Ocean. The skulls are very similar; but 

 True has collected evidence showing some important distinctions in 



