472 THE VOYAGE OF H.M.S. CHALLENGER. 



the first pair of pleopoda, and this is an appendage that exists in the same peculiar form 

 only in the males of the Penseidea besides. Whether the fertilisation of the female takes 

 place in other Schizopoda in the way it is shown by Sars to occur in the Euphausiidse, 

 by means of free sperrnatophores, I do not know, but this is just as it takes place in 

 Lucifer (vide p. 447 and PL LXXXI. figs. 1, 2 of this Report). 



5. The development of this tribe exhibits a very striking resemblance to that which 

 is seen in Lucifer, and so far as known to other forms of the Penasidea, all of which 

 appear to pass through complicated morphological changes previous to attaining their 

 adult condition. 



For these reasons I am inclined to believe that the natural position of these animals 

 is that of an aberrant tribe of the Dendrobranchiata, more nearly allied to the degraded 

 forms of the Pemeidea than to those of any other group. 



The species in this tribe belong to several genera. Those procured during the 

 expedition of the Challenger have been described by Professor Sars in his Report on 

 the Schizopoda. These he has arranged in the four families given in the table at page 

 219. 



