tS9 



of 5 5 — 80 mm. We have now a series of specimens, which 

 show the transgression from typical H. fasciatns to //. margi- 

 natus. In specimens of 35 — 85 mm. length the body is cross- 

 barred, in two specimens of 133 and 135 mm. and in another 

 of 164 mm. there are still a few traces of these bars. The 

 ventrals are extremely developed in very young stadia. In 

 specimens of 35 — 50 mm. the ventrals are even longer than 

 the pectorals and reach far on anal. In a specimen of 62 mm. 

 the ventrals, although still reaching on anal, are shorter than 

 the pectorals. One of the principal features of Bleeker's 

 H. fasciatns is the form of the dorsal, which is not concave, 

 the first rays being the shortest, the fin is gaining in height 

 posteriorly. In our specimens from 35 — 86 mm. this is distinctly 

 the case, the last dorsal rays reaching on caudal. In a specimen 

 of 133 mm. these last dorsal rays are still somewhat longer 

 than the anterior ones, but don't reach the caudal, while in 

 a specimen of 162 mm. the first dorsal rays are longer than 

 the rest. In the young stages [H . fasciatns), the fins, especially 

 the ventrals, which are nearly black, are much more densely 

 pigmented than in the adults. 



10. Hemirhamphus convexus n.sp. 



Ilcmiramplins spec. juv. Max Weber, Siboga-Expeditie, Fische. 1913, p. 132- 



D. 14— 15 ; A. 14; P. 12; V. 6; L.l. + 50. 



Somewhat compressed, the breadth of the body going 1.5 

 in its height. Height 7.3 — 7.5, "^.j in length with caudal. Head 

 from tip of upper jaw to branchial opening 3 — 3.3 in trunk. 

 Entire head 2.9, 3.4 — 3.5 in length with caudal. Length of 

 lower jaw beyond extremity of upper jaw 7 — 8 in length, 

 8 — 9 in length with caudal. Eye about i '/^ in postorbital part 

 of head and about equal to the interorbital space, which is 

 convex. Triangular part of upper jaw, formed by intermaxil- 

 laries, very short, about thrice as broad as long. Praeorbital 

 almost quadratic, much shorter than eye. Origin of anal about 

 opposite to 5th ray of dorsal. Origin of dorsal separated by 

 about 32 scales from occiput and by 5 — 6 scales from lateral 

 line. Dorsal concave, the rays increasing in length posteriorly; 

 free border of anal straight. Pectorals as long as head from tip 

 of upper jaw to branchial opening. Ventrals about half as long 

 as pectorals, the inner ray the longest. Base of ventrals some- 

 what nearer to base of caudal than to end of pectorals. Caudal 



