36 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



167). Mandible of usual form. Fii'st maxilla (fig. 168) consisting of 

 broad basal lobe with short spine at tip and gi'oup of 3 short setae. 

 Second maxilla with tip armed as in figiu-e 169. Maxilliped (fig. 170) 

 large. Terminal spine small but opposed by a very broad adhesion 

 area. Surface of adhesion area shows imprint of host denticles sug- 

 gesting a secretion of a cement-like substance on siu"face of the 

 maxilliped. The maxilliped can be easily pulled off the copepod 

 when removing the parasite from the host. 



Legs 1-4 (figs. 171-174) biramose. Spine and setal formula as 

 follows : 



seg. 1 

 seg. 2 



Legs 1-4 small and wealdy developed. Endopod of aU legs unarmed 

 except for patches of spinules. Segmentation reduced in legs 3 and 4. 

 Leg 5 (fig. 175) consistmg of a single lobe with 4 naked setae, situated 

 near the ventral distal corner of genital segment (see fig. 163). Leg 6 

 (fig. 176) consisting of 2 imarmed lobes located near junction of 

 abdomen and genital segment (see fig. 163). 



Egg strings long and straight. 



Color in life cream white without pigmentation. 



Male. — Body form as in figrn^e 177. Total length 2.9 mm (based 

 on 1 specimen). Greatest width 1.4 mm (measured at widest point 

 of cephalon). Cephalon rounded. Frontal plate distinctly separate. 

 Thoracic segments 2-4 free. No dorsal plates present. Genital seg- 

 ment longer than wide with posterior corners rounded and scarcely 

 projecting posteriorly. Spermatophores visible within. Abdomen 

 2-segmented. Caudal ramus (fig. 178) about as long as wide with 4 

 long terminal pliunose setae and 2 short subterminal ones on distal 

 corners of each ramus. Four terminal setae all nearly equal in length. 



Oral area similar to that of female. Adhesion pads reduced. First 

 antenna as in female. Second antenna as in figm'e 179. Oral ap- 

 pendages as in female. Maxilliped (fig. 180) with a strong terminal 

 claw opposed by an area of heavy ridges on basal segment. 



Legs 1-4 biramose. Spine and setal formula as follows: 



leg 1 leg 2 leg 3 leg 4 



exp. end. exp. end. exp. end. exp. end. 



seg. 1 1:0 0:0 1:1 0:1 1:1 0:1 1:1 0:1 



seg. 2 111:4 3 111:6 8 11:6 6 111:5 4 



Leg 1 (fig. 181) with each ramus 2-segmented but exopod only weakly 

 divided into 2 segments. Legs 2-4 (figs. 182-184) with each ramus 

 strongly divided into 2 segments. AU setae plumose. Leg 5 (fig. 



