604 
GEOFFREY SMITH. 
Fig. 10. — Adult female, normal. 
Fig. 11. — Under-side of abdomen of fig. 10, showing swimmei’ets 
and trough-shaped abdomen. 
Fig. 12. — Under-side of abdomen of female infected with Sacculina, 
showing reduction of swimmerets. 
Fig. 13. — Immature female, showing small flat abdomen. 
Fig. 14. — Under-side of abdomen of fig. 13, showing flat surface 
and rod-like swimmerets. 
