PLATE 8 



EXPLANATION OF FIGURES 



40 Embryo of Photuris pennsylvanica, straightened out; ventral view, about 

 same age as figure 39. A, amnion; F, antenna; I A, pleuropod; L, labium; LG, 

 legs; LI, labium; M, mandible; MX, maxilla; P, cephalic lobe; U, mouth. 



41 Embryo of Photuris pennsylvanica. more advanced than figure 40; lateral 

 view. Lettering as in figure 40; Y, yolk. 



42 An early vitellophag. 



43 Embryo of Photinus consanguineus; sublateral view. The embryo is 

 commencing to curl up, beginning at the cephalic end; lettering as in preceding 

 figures. 



44 Same embryo as in figure 43, subventral view. 



45 Embryo of Photuris pennsylvanica, nearly ready to hatch; lateral view. 

 I A; pleuropod; H, head. 



46 Cross section of Embryo of Photuris pennsylvanica. about the age of 

 figure 37; head regions; A, amnion: E, ectoderm; M, mesoderm; 0, amniotic 

 cavity; Y, yolk. 



47 Cross section of Photuris embryo of same age as figure 40: posterior end. 

 G, neural groove. 



48 Cross section of Photuris embryo of same age as figure 47; thoracic region. 

 A, amnion; IC, primitive coelomic sac; E, ectoderm; G, neural groove; M, meso- 

 derm; Y, yolk. 



202 



