PUERTO RICAN COPEPODS — GONZALEZ AND BOWMAN 253 



Bredin Expeditions and at Oyster Bay, Falmouth, Jamaica, by W. S. 

 Glidden of the U.S. Navy Oceanographic Office. All these collections 

 were made at night, indicating that P. cokeri lives on or near the 

 bottom dm*ing the day. Jacobs (1961) observed that P. coronatus is 

 not truly pelagic but sinks rapidly when not swimming and can cling 

 tightly to substrata. He found that it occurred in great numbers 

 near the bottom. Jacob's findings are probably applicable to P. 

 cokeri also. 



Remarks. — P. cokeri resembles most closely P. coronatus Williams, 

 a species that occurs in coastal waters of eastern North America, 

 from Nova Scotia (Willey, 1923) to Florida and the Gulf of Mexico 

 (Davis, 1950; Grice, 1956; Woodmansee, 1958). Grossly, the most 

 obvious difference is the appearance of the paired egg sacs; in P. 

 cokeri they are subequal ; in P. coronatus the right sac is reduced to a 

 pair of eggs. Females of the 2 species also can be distinguished by 

 differences in the genital and second urosomal segments; in particular 

 the distinctive dorsal hump and lobes on the second urosomal segment 

 of P. cokeri are missing in P. coronatus. The males differ chiefly in 

 the structural details of P5. To aid in comparison, P5 of P. coronatus 

 is illustrated in figure 7k. Its chief differences from P. cokeri are: 

 (1) the presence of a spiniforn process on the right Bl; (2) the spines 

 on the left Bl are longer and more numerous; (3) there is no bilobed 

 appendage on the right Rel and the distal spine is heavier. 



Family Pontellidae 



Head separated from PedSeg 1, often with lateral hooks. PedSegs 

 4 and 5 fused or separate. Rostrum forked, usually ending in 2 

 strong prongs, often with thickened base bearing a lens, rarely absent. 

 Eyes usually prominent, often with 1 or 2 pairs of dorsal lenses and 

 a ventral lens. Urosome often asymmetrical, 1-3-segmented in female, 

 5-segmented in male, male genital opening on left side. Female Al 

 16-24-segmented, last 2 segments always fused; right Al of male pre- 

 hensile, sometimes strongly modified. A2 with B2 and Ril fused, 

 terminal segments of Re shortened. Md blade with 5-7 teeth. Bl 

 of Mxl large; B2, Re, and Ri relatively smaU. Distal setae of Mx2 

 long and robust, coarsely plumose. Bl of Mx2 large, with long setae; 

 B2 and Ri relatively small; Re of P1-P4 3-segmented; Ri of Pi 2-3, 

 of P2-P4 2-segmented. Female P5 small; Re of 1-2 segments; Ri of 

 1 segment or absent. Male P5 uniramous, each member 3-4- 

 segmented; right P5 with chela. 



Genus Calanopia Dana 



Head without lateral hooks or lenses. PedSegs 4 and 5 fused; 

 posterior corners pointed. Female urosome 2-segmented; male 



