nac Cypnnodcnt Fish from Jolore. 



551 



The male (fig. 3) differs from the female externally in that 

 the median keel is more developed as a membranous fringe and 

 in front of it the very deep groove extends forwards, being 

 margined anteriorly by the strongly expanded hypocoracoids, 

 from between which there projects downwards and backwards 

 a large fleshy appendage, oblong in form and laterally com- 

 pressed, which may be termed the priapium ; at the posterior 

 end of this can be seen the opening of the vas deferens, and 

 at about the middle of its length, on one side, hereafter 

 termed the " proctal " side, the vent, directly behind which 

 is the urinary opening. At the anterior end is a long and 



Phalhstetlius dunckeri, male, showing external features of the priapium 

 from the proctal and the aproctal side ( X 8). 



tx. } toxactinium ; ct., ctenaetinium ; sh., shield of thick skin ; v.d., vas 

 deferens ; a., anus ; «., opening of ureter. The two last lie in a slight 

 groove which indicates the boundary between the dorsal and ventral 

 muscles. 



slender bony spine, rounded in cross-section, tapering forward 

 beneath the chin, and curved away from the proctal side ; 

 this rod may be termed the toxactinium ; it can be moved 



