OKAMOTO: SECONDARY SEXUAL CHARACTERS IN LoAcHeEs.] [Putip. Journ. Sct, 19, No. 6. 
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Fig. 1. Male and female loaches; the male showing a swelling, a, on posterior side of dorsal 
fin and strong pectoral fins with elongated second ray, b; x 0.75. 
Fig. 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, musoular layer; X about 40. 
PLATE 1. 
