364 JOURNAL, BOMBA Y NATURAL HISTORY SOCIETY, Vol. XVIII. 



The appendages differ markedly in the sexes. In the female we 

 find a basal stem or protopodite (Gr. protos. first, podite from pous, 

 podos, a leg or foot, signifying a leg segment), consisting of a very 

 short proximal covopodhe (coxa, the hip) and a larger distal piece 

 the hasipodite (J>asu. the base). To the distal end of this are arti- 

 culated two flat leaf-like structures an outer exopad'de (Gr. exo, outer) 

 and an inner endopodite (Gr. endo, inner). 



Fig 2 —Swimming foot op 2nd abdominal soiiitb op female. 

 Fta-S- „ „ opr-KD 



Fi'.l *— .. .. OF4TH 



All are of the right tide ; Figs. 2 and 3 are seen from front. Fig. 4 from behind, to show the 

 Epipodite-llke sclerite. 



The exopodite is shaped somewhat like a rabbit's ear. The greater 

 part is membranous in character, being composed of a double layer 

 of cuticle covering a little connective and muscle tissue : onlv the 

 basal portion is calcified. 



The inner margin of the endopodite is a calcified rod of three 

 piec3s united by membranous joints. In the appendage of the 

 sc co id abdominal somite the whole of the external portion forms a 

 thin membranous leaf, very like the exopodite in appearance but 

 bearing on its margins a fringe of hairs. 



The protopod'.tes and exopodites of the next three segments, namely 

 the third, fourth and fifth, resemble those of the second, but become 

 progressively smaller. The leaf of the endopodite is however curi- 

 ously divided. There is a triangular flap attached along the two 

 proximal pieces ; its free margin strengthened by numerous small 

 white sclerites. The distal piece forms a calcified margin to a narrow 

 plate. The margins of the whole endopodite bear numerous long 

 silky hairs to which the eggs become attached when laid. 



To the outer side of the protopodite of these swimming feet is 

 attached a small white sclerite with a fringe of short hairs. It may 



