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THE AMERICAN NATURALIST [Vol. L 



sal region, posterior sides of trunk or above anal fin, and 

 front side of caudal peduncle. All the anal rays are also 

 minutely and finely spinescent, though I have not found 

 any spinules on the paired fins. Spawning-males 54 to 57 

 mm., and the females smaller. The related Cyprinodon 

 bovinus of the southwest is similar. Jordamella floridce 

 is represented only by one small example with spinules, 

 these very minute along the edges of the scales above the 

 anal. No spinules found on any of its fins. 



In the four-eyed fish (Anableps anableps) of South 

 America, the males have an intromittent organ dextral or 

 sinistral. They also have the scales on the trunk, especi- 

 ally above the anal and on the predorsal region, with 

 spinules, though more numerous or dense with spinules 

 in the former space. Top of head, belly and lower sur- 

 face smooth. Sides of caudal peduncle with a few scat- 

 tered spinules. A large female, 244 mm. long, is largely 

 spinescent on the trunk above, though the spinules not so 

 dense as on scales above the anal in the male. In females 

 of smaller size, 124 to 128 mm. long, the spinules are 

 rather obsolete, sparse and scattered, also only on the 

 back and sides above. Young 27 mm. long still show the 

 umbilical sac well developed and are scaleless. 



Though I have not examined spawning examples of 

 small-finned killifish (Fundulus parvipinnis) , Jordan and 

 Gilbert state, "scales large; in the males in spring rough- 

 ened or ctenoid by small granulations and prickles, similar 

 to the nuptial excrescences of some Cyprinidas ; fins also 

 rough." 



