HUMES: COPEPODIDS AND ADULTS OF LEPT1NOGASTER MAJOR 



prominent groups of spines anteriorly. Cephalosome 

 ventrally with elongate oblique strip of small spines 

 between edge of body and region of mouthparts, and 

 with small elongate oval sclerotized area lateral to 

 level of maxillipeds (Fig. 6j). 



Caudal ramus (Fig. 6k, 1).— Elongate, 221 ^m long, 

 greatest width 44 ^m, least width 35 pcra, ratio about 

 5.5:1. Outer lateral seta 50 ym. Dorsal seta 26 ^m. 

 Outermost terminal seta 52 ym. Innermost terminal 

 seta 26 \xm. Outer of 2 median terminal setae 130 

 \m\ and almost spinelike. Inner of 2 median terminal 

 seta 440 ^m, with extremely small lateral spinules. 

 Other setae smooth. Outer margin of ramus prox- 

 imal to outer lateral seta with 2 groups of spinules. 

 Distal end of ramus ventrally with patch of small 

 spines. 



Egg sac (Fig. 6m).— Elongate, various sacs 693 x 

 209 ion, 781 x 242 ym, 860 x 220 ym (as in figure), 

 and 1,023 x 231 ym, average dimensions 839 x 226 

 ym; containing many small eggs with diameter 47-57 

 ym. 



Rostrum (Fig. 7a).— Broad with weakly sclerotized 

 rounded posteroventral margin. 



First antenna (Fig. 7b).— Six-segmented, 320 ^m 

 long. Lengths of segments (measured along their 

 posterior nonsetiferous margins): 29 (49 ym along 

 anterior margin), 88, 55, 26, 36, and 52 ^m, respec- 

 tively. Armature: 5, 15, 9, 4 + 1 aesthete, 2 + 1 

 aesthete, and 7 + 1 aesthete All setae smooth. 



Second antenna (Fig. 7c).— Four-segmented. First 

 segment with distal seta. Second segment with distal 

 seta and crescentic row of small spines. Third seg- 

 ment with outer marginal row of spines and 2 large 

 recurved clawlike spines, 34 and 70 ym. Small fourth 

 segment 13 x 21 ^m, bearing 3 long recurved almost 

 clawlike setae and 1 smaller inner seta. 



Labrum (Fig. 7d).— Posteroventral edge sharply 

 pointed medially. No surface ornamentation. 



Mandible (Fig. 7e).— Elongate with distal end bear- 

 ing 2 helmet-shaped elements and 1 stout pectinate 

 spine. 



Paragnath (Fig. 7f).— Small lobe with few distal 

 spinules. 



First maxilla (Fig. 7g).— Small lobe bearing 5 se- 

 tae 



Second maxilla (Fig. 7h).— Two-segmented. Large 

 first segment with patch of outer spinules (Fig. 7j). 

 Second segment clawlike and bearing 1 seta. 



Maxilliped (Fig. 7i).— Reduced to 2 small setae 

 located as in Figure 7j. 



Legs 1-4 (Figs. 7k, 8a, b, c).— Intercoxal plates with 

 2 groups of spines on distal (ventral) margin. Exo- 

 pods and endopods 3-segmented. Armature as 

 follows (Roman numerals indicating spines, Arabic 

 numerals representing setae): 



Pj coxa 0-0 basis 1-1 



coxa 0-0 basis 1-0 



P 3 coxa 



0-0 basis 1-0 



coxa 0-0 basis 1-0 



Leg 1 (Fig. 7k).— Coxa with 2 groups of outer 

 spines. Basis with row of small spines between bases 

 of rami and another row near large inner spine This 

 inner spine delicately barbed (Fig. 71) and 33 ym 

 long; smaller spines near its base 7.5 ^m. First seg- 

 ment of endopod with outer margin having hairlike 

 setules along proximal half but small spines along 

 distal half. 



Leg 2 (Fig. 8a).— Basis without inner spine First 

 segment of endopod with hairlike setules along outer 

 margin. 



Leg 3 (Fig. 8b).— Fine ornamentation resembling 

 that of leg 2. 



Leg 4 (Fig. 8c).— Coxa with only 1 group of outer 

 spines. 



Leg 5 (Fig. 8d).— Two-segmented. First segment 

 130 x 125 ym, with distal outer seta and group of 

 spines. Second segment elongate, 161 x 68 ^m, with 

 2 outer smooth spines, 52 and 55 ^m, distal smooth 

 seta 70 ym, and terminal finely barbed spine 147 ym. 

 These 3 spines with small spines near their inser- 

 tions. Two groups of small spines on inner side of 

 segment. 



Leg 6 (Fig. 6i).— Probably represented by 2 setae 

 on genital area. 



Color— Living specimens in transmitted light with 

 opaque gray body, eye red. 



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