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THE AMERICAN NATURALIST [Vol. XL1II 



right angles over the surface of the dorsal muscle-mass 

 that comes into the thorax from the abdomen on the 

 side of the thorax, without any coils or turns, some 4 

 mm. Each duct then descended in a slightly sinuous 

 course to the projecting base to which the antepenultimate 

 leg is attached, where it became thicker and, making a 

 short semicircular curve, entered the basal joint of the 

 leg and passed straight out to the tip of the papilla. 

 The duct contained sperm. 



Comparing these finding.- with the anatomy of normal 

 young males and females of the same species, we see that 

 in a male of 65 mm. killed in October the first pair of 

 limbs on the abdomen have much more perfected tips 

 and lack the joint near the base; while internally the 

 sperm ducts that lie alongside of the median part of the 

 testis are so coiled as to be there about 20 mm. long 

 instead of 4 mm. The duct was also larger and contained 

 more sperm. Allowing for the differences in size and 

 in time of year, the two specimens are essential I v al ike 

 and we may regard the abnormal one as perfect in all its 

 male organs, though they had not reached their final form. 

 Doubtless this male would have been able to transfer its 

 sperm to a female in the proper season, that is, in the fall. 



Serial sections of the testis show no indications of 

 any hermaphrodite nature, no ovogenesis in any part. 

 On the other hand, the different duct and the collecting 

 tubules contain some nearly mature sperms. Some of 

 the acini show spermatogonia with equatorial plates. 



The two sham oviduct-openings of this specimen when 

 compared with the real openings of a female of October, 

 some 60 mm. long, show the closest agreement externally. 

 But there is the fundamental difference internally that 



pocket, continues' directly as a wide and comparatively 

 straight tube some 10 mm. upwards to the ovary. 



In brief, then, this gynandromorph was a young male 

 that would have functioned as such at the next breeding 

 season, yet it presented two female characters, openings 



