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this respect resembling both pectoral and pelvic fins of the female. 

 Towards the end of my stay, however, a male was observed with well 

 developed vascular filaments on the pectoral as well as on the pelvic 

 fin, and on keeping a look out for this condition in future a large 

 proportion of breeding males were found to have the development in 

 a greater or lesser degree. 



Figures 1 — 4 are accurate figures of the left pectoral fins of four 

 males. Figure 1, shows the normal, usual condition. Fig. 4 represents 



3 



the most abnormal specimen that was found. The other two are inter- 

 mediate. The fishes from which these fins were drawn were all breed- 

 ing males with the vascular fringes of the pelvic fins well developed. 

 Figure 5, shows the left pelvic fin of such a breeding male (the same 

 specimen as that from which Fig. 3 is taken). It will be noticed that 

 the fin shown in Fig. 1, has the ventral border thin and slightly wavy. 



