N0 - 362! GENUS CALIGOID COPEPOD — CRESSEY 3 



unarmed except for a fringe on outer border of each, ramus held along 

 edge of basipod. Leg 4 (fig. 12) uniramose; exopod 3-segmented, each 

 segment armed as in the figure, each segment with a fringe over- 

 lapping the bases of each spine. Spine and setal formula of legs 1-4 

 follows (Roman numerals refer to spines, Arabic to setae) : 



leg 1 leg 2 leg 3 leg i 



exo end exo end exo end exo end 



seg 1 1:0 I 1:0 0:1 1:0 1:0 



seg 2 IV:3 1:1 0:2 1:1 1:0 



seg 3 111:5 6 IV III 



All setae on legs 1-5 plumose. Leg 5 (fig. 13) a single free segment 

 bearing 3 terminal setae, additional basal seta on inner lobe. Leg 6 

 absent. Egg strings uniseriate, long (2.9 mm in 1 specimen). 



Male. — Body form as in figure 14. Total length 4.6 mm. Greatest 

 width 2.0 mm (all measurements based on 1 specimen). Cephalon as 

 long as wide (2.0 x 2.0 mm). Genital segment rounded, somewhat 

 longer than wide (1.1 x .9 mm). Abdomen about 3 times as long as 

 wide (1.45 x .45 mm), widest in posterior half. Caudal rami (fig. 15) 

 about twice as long as wide (478/* x 217m) bearing 6 setae, inner and 

 outer sub terminal small and naked, terminal 4 stout and plumose, 

 inner margins of rami with row of short hairs. 



Cephalic and thoracic appendages as in female with following excep- 

 tions: Leg 2 exopod terminal segment proximal spine toothed (naked 

 in female). Leg 3 exopod (fig. 16) with 7 spines on terminal segment 

 (4 in female), inner distal corner of second segment with short pulmose 

 seta (short spine in female). Leg 5 (fig. 18) represented by 4 plumose 

 setae located at lateral sclerotized notch near mid-edge of genital 

 segment. Leg 6 (see fig. 18) represented by 2 naked setae at outer 

 distal corner of genital segment. Spermatophores rounded, visible 

 within genital segment. 



Etymology. — From Latin, masc, "serrated," alluding to the 

 toothed nature of the exopod spines of leg 2. 



The Genera of Caliginae 



The genus Caritus can be separated from all genera of the Caliginae 

 except Echetus, Alicaligus, Scianophilus, and Abasia by the absence 

 of both the postantennal process (maxillary hook) and sternal furca. 

 It can be separated from these 4 genera because they all have a fourth 

 leg exopod of only 2 segments {Caritus has 3). Not enough information 

 was available to the present author to make a thorough comparison 

 with Caligopsis Markewitsch but, according to the generic diagnosis 

 given byYamaguti (1963), the fourth legs are absent in Caligopsis 

 (thus distinguishing Caritus from it). 



