ON A LARGE PENELLA-SPECIES. 



233 



is lost. The feet of the fourth pair do not show any 

 branch and their basal joint is only furnished at their 

 distal part with an obtuse spine. According to Steenstrup 

 and Lütken in the young forms of P. varians the two 

 anterior pairs of swimming feet are provided with two 



Fig. 1. Female Fenella, about \ of its natural size. 



Fig. 3. The antennae. X 36 diam. 



Fig. 3. The swimming-feet in their natural position. X 15 diam. 



two-jointed branches, whereas both posterior pairs only 

 bear one two-jointed branch. 



Notes from the Leydeii IMuseum, Vol. XX. VI. 



