NO. 3r,s3 COPEPODS — GFJCE AND HULSEMANN 41 



separate, fourth and fifth thoracic segments separate. Posterior lat- 

 eral corner of fifth thoracic segment rounded. Rostrum 2-pointed, 

 each point with a filament. Right fu'st antenna geniculate, fifth 

 segment from end with two rounded knobs. Endopod of second 

 antenna about two-thirds the length of exopod. Mandible with two 

 setae on palpus. First maxilla with one seta on second inner lobe, 

 two setae on thu'd inner lobe, one seta on second basal segment, 

 endopod absent, exopod with five setae. Second maxilla with five 

 well-defined lobes bearing 3, 2, 1, 3, 2 setae, respectively. Long 

 and coarse setae on distal lobe and on end of appendage. Maxil- 

 liped with coarse setae distally. Exopods of first through fourth 

 feet 3-segmented. Endopods of fu'st foot 1 -segmented, of second 

 through fourth feet 3-segmented. Second basal segment of third 

 foot with distolateral spinelike protrusion. Fifth feet with right 

 exopod 2-segmented, left exopod 1-segmented. Right endopod a 

 small knob, left endopod large and bearing a large spine distally. 

 Total length .84 mm. Holotype: USNM 113539. 



Remarks: This species is different from Z. atlantica Griceand 

 Hidsemann in the structure of the endopods of the fifth feet. In 

 Z. atlantica the endopods are bulbous, and neither bears a spine. 

 The male of Z. abyssalis Brodsky is not known. It is unlikely that 

 the present specunen is the male of Z. abyssalis as this is a relatively 

 large species (2.37 mm). 



Unidentified Male 



Figures 306-319 



Diagnosis (male) : Head and fu"st thoracic segment separate, foiuth 

 and fifth thoracic segments fused. Abdomen 5-segmented, anal seg- 

 ment longer than preceding, equal in length to furca. Rostrum 

 robust, broadly rounded at tip. Left first antenna geniculate, numer- 

 ous aesthetasks on proximal segments. Endopod of second antenna 

 about two-thirds the length of exopod. Endopod of mandible 

 about two-thirds the length of exopod. Palpus devoid of setae. 

 Blade with one large and two small teeth, distal end covered with 

 numerous small spines. First maxUla with one seta on second inner 

 lobe, three setae on third inner lobe, two setae on second basal segment, 

 nine setae on endopod, and seven setae on exopod. Second maxilla 

 with five lobes bearing 4, 3, 3, 3, and 1 setae, respectively. Maxil- 

 lipeds broken off distally. Swimming feet broken off. Fifth feet 

 uniramous, each ramus 5-segmented. Distal segment of left foot 

 with 2 spinelike protrusions terminally. Total length .72 mm. 



Remarks: In most respects the present male is similar to the males 

 of the two Disco species (family AugaptiHdae) described earlier. How- 

 ever, the uniramous fifth feet of the present male apparently preclude 



