TIIH GLASS-CRABS OR PHYLLOSOMATA. 



307 



79, 7?), had gradually in the pupa (Fig. 79, f] G) assumed 

 the opposite curvature. Its dimensions are threefold those 

 of the embryo, and it exhibits vivacious movements when ex- 

 tracted from the pouch of the parent. It is not improbable 

 it may yet undergo another change of integument before ac- 

 quiring the full form of the adult. 



'I'h us it appears that, in My&is, the Nauplius-st&ge (Fig. 

 79, D, E} is passed over so rapidly that the embryo has gone 

 through it at a very early period, and nothing but the cuticu- 

 lar sheath of the body appertaining to this stage remains to 

 prove its existence. A step further, in the abbreviation of 

 the Nauplius-st&gc, and there would be nothing to distin- 



Pio. W.Phyllosoma.A, ventral view of tlio body, with the limbs I'-XX' of the 

 left side mid the bases only of XI' to XIII' represented. B, s'de viexv of the 

 body. C, the nervous system. /), the last cephalic and first and second thoracic 

 limbs. 



guish the general course of the development of .I///*/* from 

 thnt of Astacus. On the other hand, another Schizopod, 

 Euphamia, has been shown by Metschnikoff l to leave the 

 egg as a true JVauplins. 



' ZeUschriftJ-tir wiss. Zool., 1871. 



