364 THE AMERICAN NATURALIST. (VoL. XXXIX. 
kidneys would yield a condition precisely like that seen in the 
relations of the abdominal, iliac, and renal portal veins of a 
urodele. This abnormal skate serves at least to suggest a pos- 
sible way in which one of the differences in the arrangement of 
the veins of elasmobranch and amphibian may have arisen. 

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