PARASITIC COPEPOD CRUSTACEANS — LEWIS 65 



Fourth part approximately one and one-fourth times the length of 

 first, distal end sharply rounded, forming inwardly-directed, hook- 

 shaped process. Fourth part with 4-5 large and several small, 

 toothlike projections on inner margin. Postoral process (fig. 2h) 

 consisting of 2 nodules arising from platelike area of heavy sclero- 

 tization immediately lateral to mouth cone base; each nodule bearing 

 single, setide-like process distally. Alaxilla (fig. 2i) 2-segmented, 

 situated lateral and posterior to mouth cone. First segment slightly 

 less than half the length of second; anterior and posterolateral sur- 

 faces projecting distally as rounded, lobate processes that articulate 

 in depressions of proximal end of second segment. Second segment 

 more elongate than first, with fan-shaped swelling on inner distolateral 

 surface. Plumosities present on fan as well as ridge leading to it 

 from median inner surface. Outer distolateral corner with small 

 concavity bearing plumosities, plumosities extending around to antero- 

 lateral distal surface. Distal end of segment forming articulation 

 sm'face for large, saber-shaped terminal process bearing frilled mem- 

 brane along outer surface and flabby, membranous covering around 

 distal end. 



Maxilliped (fig. 2j) 2-segmented, situated medial and slightly pos- 

 terior to maxilla base. First segment strongly developed, widest 

 medially, tapering sharply proximally to rounded proximal end, grad- 

 ually to irregular distal end. Irregidar distal surface wdth V-shaped 

 inner margin, irregidarly knobbed anterior and posterior lateral mar- 

 gins and slightly knobbed outer margin. Knobs on both antero- and 

 posterolateral margins articulating in depressions on proximal surface 

 of segment. Second segment incompletely fused with elongate ter- 

 minal process. Segment and process slightly longer than first segment 

 although segment very short and heavily sclerotized; terminal process 

 long, heavily sclerotized and acuminate, curving sharply inward and 

 posteriorly. 



Thoracic legs I-IV biramous, each consisting of 1-segmented proto- 

 podite, 3-segmented exopodite and 3-segmented endopodite. Inter- 

 podal plate of each leg pair with pair of spikelike projections. For 

 nature of legs and armament, see table 2 and figures 2>a-d. 



Discussion. — Kr^yeria praelongacicula resembles K. sublineata Ya- 

 maguti and Yamasu (1959) in the nature of the setation of the thoracic 

 leg endopodites although differing from it primarily in the armament 

 of the rest of the legs as well as in the size of the organism, the natiu-e 

 of the maxilla and aciculum. The bifid aciculum tip of K. prae- 

 longacicula is found in K. spatulata Pearse (1948), although the thoracic 

 leg armature and segment size is different as well as the aciculum 

 length (K. spatulata with a shorter aciculum) and the body length 

 relationships {K. spatulata with a much longer genital segment than 



