44 



Treubia Vol. Ill, i. 



We might also add : 



Engraiilis mystax (bulu ajam) 20 + 25 = 45 



Stolephoriis indiens (tri) 20 + 17= 37 



but I suspect these, and related, species to have eggs of the type of the 

 european Engranlis, i. e. oblong, such eggs occurring in several types and 

 in considerable number in the Javasea. Thus they can be left out of 

 consideration here. 



In the larvae with v^hich this article deals we found a total number of 

 more than 70 vertebrae — in the eldest larva figured (fig. Q) 54 + 19 = 73 — 

 and thus it need not be emphasized that only the first four species of the 

 above list can come into consideration. 



Now Gilbert (cf. Boulenger, The Cambridge Natural History, Fishes, 

 1904, p. 548) has shewn a ribbon-shaped leptocephalus-like larva for 

 Albnla vnlpes, which species is not caught in any considerable quantity 

 in the Javasea. This larva does not resemble ours and thus Albnla vnlpes 

 is to be excluded. The same holds good for the related Megalops cyprinoides 

 for which VAN KAMPEN (Bulletin du Département de l'Agriculture aux 

 Indes Néerlandaises, nr. 20) describes and shows a similar larva. Thus we 



Fig. 7. Slightly older larva, with pigment-spots and black eyes. Yolk completely 

 absorbed. Length 7 mm. 



have to choose between Chirocentrus dorab and Elops hawaiensis only, 

 of which the former is more closely related to the genus Clnpea than 

 the latter. 



The decision between the two will be furnished by the number of 

 fin rays of the anal fin. First, however, we will consider the further 

 development. 



Fig. 7 shows a pelagic larva in which the eyes have become black. 

 This seems to occur, in the development of pelagic fish larvae, nearly 

 always simultaneously with the complete absorption of the yolk-sac. In the 

 rest of the body also black pigment has made its appearance. Especially 

 at the under border of the myotomes, at the left and the right of the gut, 

 a series of minute black spots is found, as we also find in species of 

 Clnpea. Dorsally a few more of these spots are found, especially at the 

 anterior end of the trunk and on the head. These spots, however, are 

 arranged in a single median series. 



