1g) (ela bs 
Pirate LILI 
The Bitterling (Rhodeus amarus). Male in breeding season.—A fter 
Siebold. 
The Bitterling (Rhodeus amarus). Female with long ovipositor.— 
After Siebold. 
Section of Mussel gill with embryoes of Bitterling intervening be- 
tween lamelle. 
Abdomen of female Bitterling. 0, ovary; ¢t, anterior extension of 
ovary; /, line free from follicles; ov, oviduct; AA, glands; R, 
oviducal tube; M, mesoarium; S, swim-bladder; P, pneumatic duct 
between air-bladder and stomach; D, intestinal canal.—After Olt. 
Mussel showing gill and directions of water currents. a, course of 
branchial flow; b, meeting place of currents from branchiz; c, in- 
halent respiratory current; d, exhalent current; ¢, mouth. 
