378 REPORT OF NEW JERSEY STATE MUSEUM. 



abdomen. Eyes in repose commonly carried at right angles to 

 longitudinal body axis, often lodged in orbits. Antennules always 

 separated from one another by septum derived from front, their 

 basal joint swollen and enlarged, flagella extremely short, and 

 commonly retractile into fossae beneath front. Antennal peduncle 

 of four joints, first often reduced, cramped and concealed. Never 

 movable antennal scale and antennal flagellum usually shorter 

 than carapace. Mouth-parts lie in well-defined fold of carapace 

 or buccal cavern. Mandibles consist of strongly calcified proto- 

 podite, free end forming triangular trenchant incisor process, and 

 a three- jointed incurved palp. Coxa and bases of first and second 

 maxilke well developed, those of second maxillae being deeply 

 cleft. Endopodite (palp) of first maxillae usually curves obliquely 

 outwards. Scaphognathite very broad plate. Flagella, when 

 present, of exopodites and maxillipeds almost always bent in- 

 wards nearly at right angles, and epipodites of maxillipeds almost 

 always very large. Ischium and merus of external maxillipeds 

 broad plates, in most cases, which completely close buccal cavern 

 like doors and conceal other mouth-parts. Thoracic legs six- 

 jointed, basipodite and ischium fused to form single piece. None 

 of these legs with exopodites, only in one primitive small group 

 do any carry epipodites or podobranchias. First pair, often en- 

 larged, chelate, second and third pairs monodactylous, and fourth 

 and fifth pairs either monodactylous, or sometimes one or both 

 may be subchelate and reduced in size. In male modified 

 uniramous appendages present on first two abdominal somites. 

 In female biramous setose appendages present on second to fifth 

 abdominal somites. Only in Bromides a pair of small uniramous 

 appendages on first abdominal somite, and in the Dromiidea alone 

 pair of plates intercalated between sixth and seventh abdominal 

 somites, modified homologues of appendages of sixth somite. 

 Ducts of male reproductive organs open either on coxopodites of 

 last pair of thoracic legs, or less commonly on corresponding seg- 

 ment of sternum itself. Oviducts almost always open on sternal 

 segment corresponding with antepenultimate pair of thoracic legs, 

 rarely upon coxae of legs themselves. Gills mostly always 

 phyllobranchiae, only in Dromiidea sometimes trichobranchiae or 

 of an intermediate character. 



