16 



MK. C. TATE REGAN ON THE 



5. Structure of Female Phallostethus dunckeri * 

 (text-fig. 12, A). 



Total length 29 mm. The mouth is less oblique than in 

 N'eostethus, and the body is less compressed ; the abdominal 

 profile is not convex, but nearly straight, the rayless fringe (/.) 



Text-figure 12. 



A, Phallostethus dunckeri, $ . B, N'eostethus lanlcesteri, $ . 

 Head and abdomen from below (X 8). 



a., anus ; p., postanal papiUa3 (in Neostethus covering the depression into which 

 oviduct and ureter open) ; o., opening of oviduct ; u., opening of ureter ; 

 y., dermal fold. 



lies in a groove instead of at the edge of the abdomen, and the 

 genital opening (o.) does not lie in a depression ; the postanal 

 papillae (p.) are minute. The dorsal fin has more rays (8 to 10) 



* I have already given some account of the structure of Phallostethus duncTceri 

 (Regan, 11) ; the sections of the male fish are too thick and somewhat overstained, 

 but with the much better sections of Neostethus lanlcesteri at hand for comparison 

 I have been able to make out certain details that were difficult to see without this 

 help. So far as I can see, the most important error in my former description was 

 that the priapial ribs, displaced forward and separated from the vertebral cplumn, 

 were interpreted as elements of the pectoral arch and the antepleural bone, which 

 embraces their ends, was not recognized as a separate bone distinct from them. 



