Phreatoico ides. 135 



inner surface, the outer margin is free. The endopodite unites 

 with the protopodite just below the tuft of setje ; it is narrow — 

 elliptical, with the margins entire, and the extremity rounded. 



The exopodite unites with the propodite at its distal extremity, 

 slightly below the junction of the endopodite. It is oblong, three 

 times longer than broad, and somewhat longer than the 

 endopodite, and reaches to about the level of the distal margin 

 of the ischios of the seventh pereiopod; the inner margin is 

 straight and free from setae; the upper margin is deeply convex, 

 and the outer margin descends in irregular outline, gradually 

 rounding off distally to form a bluntly pointed acute distal inner 

 angle ; along this convex margin there are long filamentous 

 setae sparsely disposed, but most numerous distally. 



Second pair of p/eopods (Fig. 13). — The propodite oi the second 

 pleopod is subequal to the first, but the inner and outer margins 

 are deeply convex. The endopodite is not so long, and is joined to 

 the propodite by a thick peduncle, from which, in the male, 

 arises the penial filament. This is a narrow somewhat curved 

 process, gradually tapering to a point, slightly constricted at 

 its proximal end, and reaching to below half the length of the 

 endopodite ; its inner surface is deeply grooved longitudinally. 



The exopodite is similar in general outline to that of the first, 

 except that towards the distal end a jointed small narrow lobe 

 arises from an emargination in the inner margin, situated a short 

 distance below the level of the distal extremity of the endopodite, 

 and hangs vertically downward along side of, and parallel with, 

 the continued inner margin of the large basal lobe, and extend- 

 ing somewhat below it ; the inner margin of the large lobe is 

 thickly fringed with short setaj as far as the insertion of the 

 small lobe, and from there to the extremity it is bare ; the 

 margin of the small lobe which appears as a continuous line with 

 the inner margin of the large lobe is similarly fringed with short 

 setae, which gradually lengthen distally, and continue along 

 its rounded extremity. The distal margin of the large lobe bears 

 a few long filamentous setae, and on the upper half of the outer 

 convex margin there are longer filamentous setae, somewhat 

 thickly disposed, and between these two regions there are a few 

 short scattered setae ; also over the flat surface of the lobe there 

 are a few irregularly scattered setae. In the female the appen- 

 dage is similar in form except in not having a penial filament. 



