582 DELPiiiNiD.i;. 



two may be identical. Both are smaller than T. tursio and 

 ha\e dark spots on the lower surface. The skull of T. catalaniais 

 16-75 inches long by 7*5 broad between the orbits, rostrum 9-75 

 long. Ddphiiius {kiteuo ?) maculiventer (p. 585) of Owen may be 

 TursiojJS catalania. 



Genus STENO, Gray (1846). 



Head prolonged into a distinct narrow snout, which is separated 

 by a groove from the forehead. Dorsal and pectoral fins falcate. 



Eostrum of skull long, narrow and compressed. Symphysis of 

 mandible long, one fourth to one third the length of the ramus. 

 Teeth of moderate size, about one fifth (4-6 millim.) of an inch in 

 diameter ; 20 to 35 on each side of each jaw. Vertebrae oi S. fron- 

 tatvs; C. 7, D. 12, L. 15, C. 32=06. 



The species found on the coast of India are in part referred to 

 Sotalia by Flower and True ; but the differences bet\\een the Indian 

 types here brought together appear to me scarcely to justify generic 

 distinction, until the skeletons are known. The typical Sotalire 

 are estuarine or fluviatile dolphins with 51 to 55 vertebrae. 



Synoj)sis of Indian Species. 



A. Teeth very rugose, ^ to ^ S. fronfatns, p. 582. 



B. Teeth nearly smooth. 



a. Rostrum more than | length of skull ; 



teeth about |^ S. pbimbcns, p. 583. 



h. Rostrum less than f of skull. 



«'. Dark grey ahove ; teeth about „-.... S. perniger, p. 583. 



h' . Speckled throughout ; teeth about g^ 8. lentiginosus, p. 584. 

 c'. Black above ; teeth V- 8.? viacidivcnter, p. 585. 



389. Steno frontatus. Tlie rour/Ji-toothed Dolphin. 



Delphinus rostratus, Shcnv, npvd Cuv. Aim. Mus. xix, p. 10 (1812) ; 



JJefimarest, Nouv. Diet. H. N. ix, p. 160, nee Shcno. 

 Delphinus frontatus, Cuv. Oss. Foss. ed. 2, v, pp. 278, 400, partim 



(1823). 

 Delphiuorhynchus rostratus, Blyth, J. A. S. B. xv, p. 368. 

 Sleno rostratus, Bhjth, J. A. S. B. xxviii, p. 491 ; Floicer, P. Z. S. 



1883, p. 483 ; Trite, Delphinidee, i)p. 24, 157, pi. vi, figs. 1, 2 ; 



W. Sclater, Cat. p. 324. 

 Steno frontatus, Blyth, Cat. p. 91. 



Snout long. Teeth |^ to p, distinctly rugose, the enamel closely 

 pitted with irregular very wavy furrows. Kostrum long and com- 

 pressed, its breadth in the middle varying from l to more than 



