57 



Family ii. Al/>l<jt1ge. The 1st pair of thoracic legs is robustly chclatc, 

 one being larger than the other: the 2ml pair has a carpus compounded of 

 many segments. 



Family f((si jihceidce Smith, Bate. 



Pasifhu-iJn; S. I. Smith, Albntross Crustncoa in Rep. U. 8. Finn. Comm. for 1882 (1884), p. 381. 

 Pasiphwidie, Spenco Bate, Challenger Crust. Macrura, p. 867: Stebbing, Hist. Crust., p. 251: Ortmnmi, 

 in Bronn's Thier Reich, p. 1125, Arthropoda. 



Rostrum short, sometimes represented by a spine or tooth arising behind the 

 frontal margin. Antennular scale large. Antennal scale with a broadish tendency. 



Mandible with a single serrated edge, not cleft into two distinct proce.- 

 mandibular palp present or absent. 



The coxa and basis of the 1st maxillge are always well developed, but tlmse 

 of the 2nd maxilla? and 1st maxillipeds are sometimes small or rudiment; uy, 

 sometimes obsolete, and only in one genus (Psathyrocaris) are perfectly normal. 



The terminal joint of the 2nd maxillipeds is a distinct dactyl us articulating 

 with the distal end of the propodite. The external maxillipeds are long and 

 pediform. 



Exopodites, which often arc very long, are present on all the thoracic legs : 

 they are also present though sometimes they are very small on the external 

 maxillipeds; they are rarely present and then are very small on the 2nd 

 maxillipeds ; but they often constitute the chief part of the 1st maxillipeds. 



The first two pairs of thoracic legs are the longest and much the stoutest : 

 they end in elongate chela? with long slender fingers : the carpus of the 2nd pair, 

 like that of the 1st, is short and unsegmented. The last three pairs of thoracic 

 legs are always slender, and the penultimate pair is usually short, as sometimes 

 is the last pair also. 



The eggs are usually large. 



St/in>i>nix af fh<' iji'in'ra of Pasipha?ida? of the /</<//</,/ 



The abdominal appendages ore of the ordinary kind: the 4th pair of 

 thoracic legs are nhvnys very short : the 2nd maxilliv consist chiefly of 

 seaphoguathite, the coxa and basis being small or obsolete and the 

 endopodite being abnormally small : the Jst maxillipeds consist chiefly 

 of exopodite, the coxa and basis and endopodite being rudimentary or 

 obsolete though the epipodite m:iy hi- distinct and independent: the '2nd 

 maxillipeds have no gill-plume : 



1. Body strongly compressed : the rostrum is usually a post .frontal 

 spine or tooth : the mandibles have no palp : the coxa and basis 

 of the 2nd maxillfe and Jst maxillipeds are obsolete, the latter 

 appendages consisting almost entirely of exopodite : the 5th 

 pair of thoracic legs is about twice as long as the 4th ... PASIPH.SA. 



8 



