302 



The views of G r u b e r on the reproductive organs are confirmed. 

 The sexual ducts are described as outgrowths from the sexual glands, 

 themselves derived from a pair of cells of the serosa of the gut of the 

 Nauplius as stated by Fric. About 32 spermatozoa appear to be for- 

 med from each male ovum or spermatospore. The author is inclined 

 to accept G ruber's view that the expulsive bodies of the spermato- 

 phore are a second form of spermatozoa. 



The author then proceeds to a discussion on the position of the 

 Copepoda. He adduces the following points. 



a. The plasticity of the eye, derived from the triune inverted eye 

 of the Nauplius and the absence of paired compound eyes. 



h. The biramous condition of the swimming-feet, and the cha- 

 racters of the appendages generally, especially the plasticity of the 

 maxillse. 



c. The slight development of the pleura. 



d. The absence of gills, and the functional anal respiration. 



e. The plasticity of the fore part of the alimentary canal. 



f. The circulation and heart. 



g. The general correspondence of the form of the body with that 

 of the Protozoea and Zoea larva. 



By converging arguments from these points, it is shown that Co- 

 pepoda would represent the most primitive Crustacea, from which the 

 others can be derived according to the following phylogeny. 



Copepoda natantia [Mesopeda] 



Copepoda parasitica 

 Eudiplopida. 



■r'r r,.-,'.-. 'f -, 



Eudiplopida Stenopleura Eudiplopida hathypleura 



[Branchiui^a] I 



Cirrhipedia Rhizocephala Osfracoda Protophjllopoda 



or 

 Podohranchiata 



