SPECIAL CASES OF SEX-INHERITANCE 235 



where large and small eggs are produced by the same 

 female (Fig. 109). The female lays her eggs in clus- 

 ters, from three to six eggs, as a rule, in each cluster. 

 The large eggs produce females ; the small eggs pro- 



FIG. 109. DinophUus gyrdciliatus. Females (above and to left) and 

 males (below and to right). Two kinds of eggs shown in middle of lower 

 row. (After Shearer.) 



duce rudimentary males that fertilize the young fe- 

 males as soon as they hatch and before they have left 

 the jelly capsule. 



Von Malsen kept the mother at different tempera- 

 tures, with the results shown in the table. The ratio 

 of small eggs to large eggs changes. But the result 



