COPEPODA FROM IFALUK ATOLL 



97 



Figure 31. — Perissocope hayeri, new species, loc. 589, ad. 9, holotype: a, whole animal, 

 lateral view frona left side; h, same animal, dorsal view; ad. cf , allotype: c, whole animal, 

 dorsal view. (X 250.) 



Body moderately but distinctly depressed dorsoventrally, spindle- 

 shaped in dorsal aspect, without distinct division between cephalo- 

 thorax and abdomen, greatest diameter at end of cephalic somite, 

 rounded anteriorly and very gradually tapering posteriorly (fig. 2>\h). 

 Head and 1st thoracic somite completely fused to form cephalic 

 somite, which is as long as combined lengths of thoracic somites 2 to 

 5. Rostral plate and part of rostrum distinctly visible from above 

 as rounded tubercle on front of head; in lateral aspect rostrum fairly 

 small, rounded at apex and directed forward and slightly downward. 

 Two fine hairs of frontal organ clearly visible. Thoracic somites 2 



