ILLUSTRATION 
Plate 1 
Fig. 1. Male and female loaches; the male showing a swelling, a, on pos- 
terior side of dorsal fin and strong pectoral fins with elongated 
second ray, b; X 0.75. 
2. Cross section of the swelling on the male loach; a, fat cells in the 
scale pouch; b, fatty tissue; c, epidermis; d, corium; ; e, muscular 
layer; X about 40. 
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