SECT. XI 



DEVELOPMENT 



153 



smallness of the Nauplius it is not easy to ascertain 

 exactly where the limb springs from ; Claus states 

 that it rises on each side of the prostomium or 

 upper lip. 



ie second nnio is biramose, i.e. besides the sensory 

 cirrus, the parapodium on which it stands is also re- 



FIG. 35. Nauplius of Lepidurjis productus (after Brauer) ; commencing segmen- 

 tation of the trunk disguised. A comparison with the and stage, Fig. 40, shows 

 that the trunk in the Nauplius certainly corresponds to several segments, d, 

 dorsal parapodium of the 2nd antenna ; c, sensory cirrus. 



tained. Repeating the homologics brought forward 

 in the section on the appendages pp. 32 and 33, the main 

 stem of this second limb of the Nauplius is composed 

 of the dorsal parapodium together with its sensory 

 cirrus ; the true tip of the dorsal parapodium appears 

 like a small branch. Here clearly the exopodite is the 

 sensory cirrus, the endopodite the tip of the dorsal 



