distal corners, otherwise armed as in previous 

 species. 



First antenna (fig. 55) 5-segmented; basal seg- 

 ment largest, remaining four all of about same 

 length, armed as in figure. Second antenna 

 (fig. 56) 5-segmented; second segment longer than 

 other four combined, third segment with sliieldlike 

 process originating at base and surrounding en- 

 tire inner surface of segment plus part of fourth 

 segment, claw of antenna cradled in this shieldlike 

 process. Mandible, first and second maxilla (fig. 

 57) similar to preceding species; maxilla larger 

 than in A. tenax, with two setae. Maxilliped 

 lacking. 



Legs 1 to 4 biramose. Leg 1 (fig. 58) exopod 3- 

 segmented, spine on outer distal corner of first seg- 

 ment and two spines on out«r edge of last, segment, 

 otherwise armed with setae as in figure; endopod 

 2-segment«d, two short spines on terminus of 

 ramus, outer edge of both segments with numerous 

 spinules, setae arranged as in figure. Leg 2 (fig. 

 5&) rami 3-segmented; one spine on outer distal 

 corner of exopod last segment, otherwise rami 

 anned with setae as in figure. Leg 3 as leg 2. 

 Leg 4 (fig. 60) exopod 2-segmented; endopod 3- 

 segmented, with a spine on outer distal comer of 

 terminal segment, otherwise rami with setae as in 

 figure. Spine and seta formulas for legs 1 to 4 

 follow : 



Leg 5 (fig. 54) papilla with one seta near an- 

 terior comer of genital segment. Leg 6 absent. 



Egg sac 945 n long, containing about 50 eggs. 



Color in life unknown. 



Male. — Unknown. 



Etymology. — The specific name cunula is Latin 

 for "small cradle" referring to the cradlelike struc- 

 ture on the second antenna. 



Remarks. — This species may be distinguished 

 from A. tenax by the nature of the second antenna 

 and the first leg. These two species may be further 

 separated by the differences in the spine and seta 

 formulas for legs 1 to 4. 



COPEPODS AND NEEDLEFISHES 

 373-320 0—70 



Paraergasilus remulus Cressey, New Species 



Figures 61 to 70 



Specim£ns studied. — A single collection from 

 Xenentodon cancila (UMMZ 181174) collected in 

 a tributai-y of Prek Andhor, Cambodia. Holotype 

 female (USNM 125689) and one paratype female 

 (USNM 125690) attached to upper inner surface 

 of operculum (not on gill filaments) of host. 



Female. — Body form as in figure 61. Total 

 length 443 ju,. Greatest width 153 ;«. Thoracic seg- 

 ments bearing legs 2 to 4 fi-ee. Thoracic segment 

 bearing leg 1 separated from cephalon, articula- 

 tion weak giving appearance of segment being in- 

 corporated into cephalon. Thoracic segments bear- 

 ing legs 2 to 4, each narrower than preceding 

 segment. Genital segment (fig. 62) slightly wider 

 than long (47.8 fx. by 41.3 /i). Abdomen (fig. 62) 

 3-segmented, first two each with a row of spinules 

 along the ventral posterior border as in figure. 

 Caudal rami slightly longer than wide (16.5 ^ by 

 14.7 yii), with four terminal setae, innermost con- 

 siderably longer (90 /*) than other three and with 

 a bulbous swelling about 20 ja from base; ventral 

 surface of ramus with an interrupted row of spi- 

 nules near base of setae. 



First antenna (fig. 63) 5-segmented and armed 

 with numerous delicajte setae. Second antenna (fig. 

 64) 4-segmented; second segment with a short 

 seta on outer distal corner; terminal segment with 

 three long terminal setae and one short subter- 

 minal seta. Mandible (fig. 65). first maxilla (fig. 

 66), and second maxilla (fig. 67) very small; even 

 at a magnification of l,500x, it was difficult to make 

 out details of these three appendages. Maxilliped 

 absent. 



Legs 1 to 4 biramose. Rami of legs 1, 2, and 3, 

 3-segmented. Leg 1 (fig. 68) coxopod with row of 

 spinules; last segment of endopod bearing two 

 broad spines in addition to four setae. Leg 2 (fig. 



69) and leg 3 the same in appearance. Leg 4 (fig. 



70) exopod 2-segmented, endopod 3-segmented; 

 eacli armed as in figure. All setae on legs 1 to 4 

 plumose. Spine and seta formulas for legs 1 to 4 

 follow : 



363 



