■2. STENO «. KOSTKATUS AND PEK.SPICILLATUS. 157 



STENO ROSTRA.TUS (Desmarest). 

 (Plate 6, figs. 1 aud2.) 



Snout long, separated from the low forehead by a distinct constriction. 

 Dorsal and pectoral tins falcate. 



Color of the upper surfaces and fins purplish sooty black ; sides 

 marked with rather large stellate yellowish- white spots. Snout and 

 under surfaces of the body white, more or less tinged with purple and 

 rose-color, and marked with jjrominent purple spots. (Liitken.) 



Vetebrie: C. 7; D. 13; L. 15; Ca. 30 = 65. 



Teeth, ^o to l^; rugose. Skull massive. Eostrom long and com- 

 pressed, its breadth at the middle 11.5 per cent, to 18.8 ])er cent, of 

 its length. Frontal plates of the maxilhe strongly bent; interniaxilUe 

 convex, at wide opening between them opposite tlie maxilhiry notch. 

 Temporal fosste very large and rounded; pterygoid bones meeting in 

 the median line; vomer extending to the middle of the palate and visi- 

 ble in the median line ; mandible growing gradually attenuated from 

 behind forwards, not keeled at the symphysis. Symphysis very long. 



Measurements of tlie sJiull. — (British Museum No. olGa. Type of /iS'. 

 compressus): Total length, 51.1*^^'"; length of rostrum, S-.S*^'"; breadth. 

 of rostrum at its base, 9.3*^^'"; at its middle, 4.2*^'"; breadth of intermax- 

 iila3 at same point, 2.9'""; breadth between orbits, 16.4'"'; length of tem- 

 poral fossa, 8.6'^'". (British Museum No. 345c. Type of S. frontatus) : 

 Total length, 51.1c°i; length of rostrum, 3(K"'; breadth of rostrum at 

 its base, 10.7<='"; at the middle, 5.2<="'; breadth of intermaxillai at same 

 point, S-e*"'*; breadth across orbits, 19 3""; length of temporal fossa, 

 10.7'^'". (For measurements of the exterior see page 28.) 



Habitat. — Indian Ocean. Java. Atlantic Ocean; 1° 14' S. lat., 17^ 

 20' W. long. {LiitJven.) 



STENO PERSPICILLATUS Peters. 

 (Plate?, lij,^s. 1 and 2.) 



Form generally like TiirsiojiS tursio. Beak distinctly separated oft' 

 from the forehead. Dorsal and pectoral fins falcate. 



Back black, belly white, sides of body and head yellowish white. A 

 milk-white stripe from the pectoral fin to the eye. Eye surrounded by 

 a brown ring, from which a narrow brownish-black line goes forward 

 along the base of the forehead to meet its fellow on the opposite side 

 of the head. A similar line from the corner of the mouth to the base 

 of the pectoral fin. (Peters.) 



Teeth, I ; rugose. Vertebrte: C. 7; D. 12; L. 15; Ca. 32 = 66. 

 Skull like that of 8. rostratus. (See p. 25.) 



Measurements of the exterior (From Peters). — Total lengtb, 92.8 inches 

 (185''") ; extremity of snout to dorsal fin, 33.3 inches {S2'"") ; to pectoral 



