34 IHE AMERICAN NATURALIST VOL. XXXV. 
` L 
2. The second case is of much greater interest. It is a 
— 
specimen of Ameiurus natalis, 120 mm. long, from Turkey 
Lake, Ind. It differs from normal specimens in the absence 
of all traces of ventral fins. There are no scars to indicate 
Fic. 1. — Ventral view of Rana Pipiens, with supplementary arm. 
that the fins might have been lost as the result of a wound, 
and we may safely assume that in this specimen we have a 
case of saltatory variation which is perfectly bilateral. Such 
a variant, if its characters should be slightly prepotent, would 
give rise to a race of individuals without ventral fins, which, in 
nature, would readily be recognized by naturalists as a distinct 
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