64 



G. 0. SARS. 



[No. 1 



bråne, or chorion; v vitelline membrane, closely invest- 

 ing the yolk. 



Fig. 2. Another egg, along with the cirrus, to which it is 

 affixed; letters as in the preceding figure. 



Fig. 3. First stage of embryo, from above: cli chorion ; v vitel- 

 line membrane; a- antennæ. 



Fig. 4. Same, from below: L labrum; M mandibles; remaining 

 letters as in fig. 3. 



Fig. 5. Same, from left side: x upper projecting part of head. 

 where the occipital process will develop; / embryonic 

 cuticle; remaining letters as in fig. 4. 



Fig. 6. Second stage of embryo, from above. The chorion (ch) 

 has become to some extent detached from the other 

 parts: C edge of the developing shell; remaining letters 

 as in figs. 4, 5. 



Fig. 7. Same, from below: L labrum; remaining letters as in fig. 6. 



Fig. 8. Same, from right side: m maxilla of first pair; / embryonic 

 cuticle; remaining letters as in figs. 5, 6. 



Fig. 9. Later stage of embryo, from above. The chorion has 

 been east off and the vitelline membrane (r) more widely 

 separated from the embryo; letters as in fig. 8. 



Fig. 10. Same. from below; letters as above. 



Fig. 11. Same. from left side; letters as in fig. 8. 



Plate VII. 



Development of the Summer-eggs, continued. 

 Fig. 1. Later stage of embryo; from above, magnified 78 dia- 

 meters. Both the vitelline membrane and the embryonic 

 cuticle have been east off: m 1 maxillæ of first pair; T 

 tail; remaining letters as in the preceding figures of 

 plate VII. 



Fig. 2. Same embryo, from right side; L labrum; m 2 maxilla 

 of second pair; p 1 leg of first pair; remaining letters 

 as in fig. 1. 



Fig. 3. Anterior part of same embryo, from below; letters as 

 above. 



