NO. 2 THORACIC MECHANISM OF A GRASSHOPPER SNODGRASS 



II 



It is claimed by Becker (1923, 1924) that the pleurites, the coxae, 

 and the trochanters in the Chilopoda are formed, during the develop- 

 ment of the individual, from numerous schlerotizations in the lateral 



Endp 



Fig. 7. — Maxillipccls and pleuron of a decapod crustacean, Macrobrachium 



jamaicensis. 



A, first maxilliped, left, posterior surface. B, second maxilliped, right, an- 

 terior. C, third maxilHped, left, posterior. D, left pleuron, or inner wall of bran- 

 chial chamber. 



Brn, branchia, gill ; Cx, coxa ; Cxpd, coxopodite ; Endp, endopodite ; Eppd, 

 epipodite ; Expd, exopodite ; Sex, subcoxa ; iTr, first trochanter. 



walls of the body segments, which unite to form the definitive leg 

 bases and the pleural sclerites of the adult. Though the apparent 

 facts in the development of the chilopods may be as Becker describes 

 them, it is difficult to see how they can be interpreted literally as repre- 



