^o- 3o94 SARSIELLA — KORNICKER 29 



the 2nd joint has 2 short bristles near the middle; the 3rd joint has 



2 short terminal bristles. A 3rd bristle is present on the 2nd joint of 

 the adult. 



Mandible: In the embryo the claws of the endopodite are only 

 weakly sclerotized. The mandible of mstars III-IV and the adult 

 female are similar. The adult male differs in having longer dorsal 

 bristles on the basale and in having the claw of the 1st endopodite 

 joint situated more proximally on the ventral margin. 



Maxilla: In the embryo the 2nd joint of the endopodite has only 



3 b- and d-bristles. The maxiUa of instars III-V and the adult 

 female are similar. The maxilla of the adult male differs from the 

 female in being smaller, having 1 instead of 3 endites, and in having 

 bristles of the end joints distributed differently. 



Fifth limb: In the embryo the 5th limb is poorly developed and 

 minute. In instar III it is similar to the adult female except for 

 having 2 instead of 3 bristles on the 2nd exopodite joint. Instars IV 

 and V are similar to the adult female. The 5th limb of the adult 

 male differs from the female in being considerably smaller and also 

 in the distribution of marginal hairs on bristles. 



SLxth limb: In the embryo the 6th limb is minute and foliaceous 

 with marginal hairs. In instar III the 6th limb has 1 terminal bristle. 

 In instar TV the 6th limb is similar to the adult female with the 

 exceptions of having 2 instead of 3 bristles on the endite and 8 instead 

 of 10 bristles on the end joint. Instar V is similar to the adult female. 

 The 6th limb of the adult male is somewhat smaller than on the female. 



Seventh limb: In the embryo the 7th limb was not observed and is 

 probably absent. In the female in instar III the 7th limb is a short 

 stump, in instar IV the 7tli limb is elongate but bare; in instar V the 

 7th limb has 4 small teeth near the tip, 4 distal bristles and 4 proximal 

 bristles; in the adult the 7th limb has a terminal comb of about 6 

 teeth opposite a smaller comb with 4-5 teeth, 6 distal bristles, and 

 4-6 proximal bristles. In the male the 7th limb consists of a short 

 stump on instars and is absent or negligiljle in adult. 



Furca: In the embryo the fm'ca has only 3 claws. In instars III-V 

 the furca is essentially the same as in the adult except for variations 

 in the distribution of marginal teeth on proximal claws. 



Copulatory organs: In the female instars III-V the genitalia are poor- 

 ly developed ; in the adult the genitalia contams 2 large vaginal openings. 

 In the male genitalia are undeveloped on instars III and IV; on instar 

 V the copulatory limb is bilobate and has a hooklike "clasping organ" ; 

 in the adult the hooklike organ is strongly developed and complicated, 

 and each lobe bears 2-4 bristles. 



Frontal organ: In the embryo and instars III and IV the frontal 

 organ is elongate and 1-jointed with a rounded tip. In instar V and 



