90 



HISTOEY OF CEUSTACEA. 



Chap. IX. 



A pair of similar filaments spring, in the larvae of the 

 Cirripedia and Ehizocephala, directly from the brain. 



Fig. 56.7 



At the base of the inferior antennae in the Decapoda 

 the so-called '* green-gland" has its opening; in the 

 Macrura at the end of a conical process. A similar 

 conical process with an efferent duct traversing it is very- 

 striking in most of the Amphipoda. In the Ostracoda, 

 Zenker describes a gland situated in the base of the 

 inferior antennae, and opening at the extremity of an ex- 

 traordinarily long " spine." In the Nauplii of Cy clops 



7 Fig. 56, Nauplius of Sacculina purpurea, shortly before the second 

 moult, magn. 180 diam. We may recognise in the first pair of feet the 

 future adherent feet, and in the abdomen six pairs of natatory feet with 

 long setae. 



