Description of Two New Phyllopoda. 23 



by the figure, this leg, though scarcely half as large 

 as the anterior ones, exhibits quite a normal structure. 

 The hindmost pairs, on the other hand, successively assume 

 a somewhat different appearauce, owing to the considerable 

 shortening of the endopodite, and the consequent dense crowd- 

 ing together of the endites. Fig. 4 represents a leg of the last 

 (20th) pair magnified to the same scale as the preceding figures, 

 and fig. 5, the same leg much more strongly magnified. It 

 will be seen, that the coxal lobe is still rather well developed, 

 whereas the endopodite itself is greatly reduced in size, 

 being scarcely longer than the former, though still exhibiting 

 all its endites. These are, however, very small and densely 

 crowded together, for which reason their setæ are also much 

 less numerous than on the other pairs, and of a somewhat 

 different appearance, not being falciform. The exopodite 

 is in the form of a rather broad plate extending down- 

 wards and considerably beyond the endopodite. The plate 

 carries 9 strong, and rather distant, plumous setæ, the 

 uppermost of which originates from a short conical process 

 representing the rudimentary dorsal lappet of the exopodite. 

 The epipodite is of inconsiderable size, and extends straight 

 outwards, instead of, as in the greater number of the other 

 legs, upwards. 



Description of the male. 



(PL V, VI). 



The shell of the only specimen examined has a length 

 of 5 1 /2 mm., and is accordingly considerably smaller than 

 that of the female, though the specimen appears to have 

 attained its full size, exhibiting, as it does, the same number 

 of lines of growth as in adult females. 



