446 



of the genus Anapronoe in an independent family and several less sig- 

 nificant changes in the traditional arrangement (composition) of families 

 of this group appear completely justified. 



XVI. Family PRONOIDAE Claus, 1879 



Small, medium and large crustaceans ranging in length from 4 to 20 mm, 

 with a thick integument which is smooth for the most part but sometimes 

 covered with a reticulate structure. The body is compact, somewhat com- 

 pressed laterally, and curved ventrally. The eyes are large, occupying a 

 large part of the surface of the head. The head is large, higher than the 

 pereon, in individual cases equal to it in length, in males laterally dis- 

 tally tapered, in females uniformly rounded. The mandibles in females 

 and males bear a palp; maxillae I and II are relatively well developed. 



Antennae I in females have a three-segmented, in males four- 

 segmented flagellum, the basal segment of which is large and strongly 

 curved forward or short. Antennae II in females are absent or 

 rudimentary; in males they have a long, folded four times or rudimentary 

 flagellum. 



The coxal plates are not fused with the pereon somites. Pereopods I 

 are usually simple, sometimes with a subchela. Pereopods II in most 

 species have a finely denticulate chela, sometimes (in Pronoe and Para- 

 lycaea) they are simple. Pereopods V are longer than the rest, their basal 

 segments broadened and generally oval, and the distal segments artic- 

 ulate with them terminally or subterminally. In pereopods VI the basal 

 segments are strongly broadened but not operculiform. The 2nd segment 

 of pereopods VII is quite broad, the distal segments rudimentary, usually 

 one or two, but in anomalous situations this number may be more. All 

 rami of the uropods are well developed; the endopodites of uropods II 

 and III are free except in the genus Paralycaea. The telson is not fused 

 with the last urosomite. 



The family includes four genera. 



KEY TO GENERA OF FAMILY PRONOIDAE 



1 . Pereopods II with chelae 3. 



— Pereopods II without chelae 2. 



2. Telson longer than last urosomite. Endopodite of uropods III fused 

 with basipodite 4. Paralycaea Claus. 



— Telson approximately half the last urosomite in length. Rami of 

 uropods free 2. Pronoe Guerin-Meneville. 



3. Length and width of last urosomite approximately equal. Rami of 



uropods II and III with rounded tips and smooth margins 



1 . Eupronoe Claus. 



