588 delphinidtE. 



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



Delpliinus longirostris, Dussumier, Cur. Hcc/tie An. ed. 2, i, p. 288 

 (1829); Floiccr, P. Z. S. 1883, p. 503; True, DeliMnuhc, pp. u8, 

 161, pi. xii, fig. 2 ; W. Sclater, Cat, p. 322 [nee Grmj, Spic. Zool. p. 1 

 (1828)]. 



Colour and other external characters unknown. 



Teeth ^. Eostrum greatly elongate. Symphysis o£ mandible 

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

 phis. 



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

 o*75, length of rostrum 13*25. 



Distribution. Malabar coast. 



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

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

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

 I find, on examining the skull, is quite distinct, having only 'f^ 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 ^g 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 Medaij Dolphin. 



Delphinus malayauus, Lesson, Voy. Cu(piille, Zoul. i,-p. 184, Atlas^ 



pi. ix, fig. 5 (1826). 

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



F. Cuv. Hist. Nat. 3frM/i. pi. 425 ; Fuchemn,ltev. Maej. Zoo/. 1856, 



p. 453. 

 Steno attenuatus. Gray, Zool. Ereh. 8)~ 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, Flmuer, List Cetacea B.3I. 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 medayamis, D. atten- 

 %udus, and D. frcnnatus (D. doris, (Iray), all of which have been re- 

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

 True has collected evidence showing some important distinctions in 



