APPENDIX F 



rim-rays of the tail fin are only visible in the first stage. 

 The ventrals are the smallest of all, and lie in the middle 

 of the body. 



Of the inner organs the swim bladder is developed ahead 

 of the rest. In life it appears as a small shimmering point. 

 It lies above the ventrals. 



There are about sixty-nine muscle bands evident, of 

 which forty-eight or nine compose the body (between the 

 ventrals and anus, 22), and twenty or twenty-one the tail. 



On the ventral aspect of most of the myomeres is a 

 chromatophore. Besides these, small chromatophores lie 

 along the upper and lower caudal rays, and along the pos- 

 terior edge of this fin. Above the swim bladder lies a 

 pigmented cap. 



A methylen blue preparation of 30 mm. larva, reveals 

 the osseus beginnings of the cranium, the basal part of 

 the pectorals and the fin-ray supports of all unpaired fins, 

 but not yet of the vertebral column. The ray supports of 

 the dorsal and anal fin rest upon two pieces of which the 

 distal (basiostegal) is small and round. 



The great number of rays of the anal fin makes it un- 

 likely that the larvae under consideration belongs to Albula 

 conorhynchus, which possess only 9-10. In comparison 

 the number agrees well with allied Megalops cyprinoides 

 (anal rays 23-28), while in Elojps saurus these are also 

 much fewer (15-17). Other near related forms do not 

 occur in the Archipelago. I dare assert with considerable 

 assurance that this larva is that of some specimen of 

 Megalops, especially as this genus is the only one which 

 occurs commonly in the harbor canals of Batavia. 



P. N. van Kampen. 



4: 4: * ♦ 4: * ilc 



As this volume was about to go to press the following 

 article was printed in the Bulletin of the New York 

 Zoological Society, Vol. XXXI, No. 2, March-April, 1928, 

 page 54: 



229 



