113 



the fully formed larva is that shown in PI. XV, Fig. 4, with only two 

 arms, the postoral ones, which are fairly long, about body length. There 

 is, however, a considerable variability in the larval shape; another pair 

 of arms, the posterodorsal ones, may develop, but sometimes only one of 

 these arms is formed. Also the arms may coalesce to a various extent. 



Fig. 47. Various forms of the larva of Peronella Lrsueuri. 100 /i- Only in OIK- of them the 

 young spines are drawn; all the specimens figured were at about the same stage of develop- 

 ment. Drawn from lite. 



Thus the variation as regards the larval shape is rather phantastic, as seen 

 from the sketches represented in figure 17. And these larv* could not be 

 designated as abnormal, since the metamorphosis \v;is rompleled by all 

 of them, even by the one with no arms at all. Also among the larvae reared 

 by Tennent corresponding variations occurred, even a specimen with 

 five arms, which I have not observed. On account of the rudimentary 

 character of the larva these variations are not very surprising; possibly 



