COPEPOD GENUS RIDGEWAYIA — WILSON 147 



ilia with six well-developed lobes and unsegmented apical portion; 

 basal division with two lobes. 



Leg 1 (from fig. 42) : Exopod 2, outer distal part with flattened, 

 serrate process, a slender spine (or process?) between it and outer 

 spine, both shorter than outer spine. Inner apical spine of exopod 3 

 a little longer than exopod 2-f 3, equal to about 75 percent of total 

 exopod length. (See p. 168 for detail of setal armature of legs 1-4.) 



Leg 5, female: Exopod 3 with the three outer spines shorter than 

 segment; inner apical spine subequal to segment and about twice the 

 length of outer apical spine; basal joints of all inner setae reaching 

 beyond point of insertion of succeeding seta. Endopod segment 2, 

 first inner seta placed a little above middle, at point about 44 percent 

 of total length of segment; first outer seta placed below middle 

 of segment, at point about 69 percent of total length of segment. 



Leg 5, male (rami separated in Esterly's illustrations, and the basal 

 segments of left leg incompletely shown; not possible to judge relative 

 length of left and right sides): Eight exopod, outer spine of segment 



1 reaching to about middle of segment 2; tip of exopod 2 truncated, 

 without lappet or partial division, with two outer spines, relative 

 length of segment and first and second spines about 38:20:15. Left 

 exopod 3-segmented; segment 1 with long, narrow, setiform outer 

 spine that reaches a little beyond the second segment. Second seg- 

 ment about twice the length of and much broader than first segment, 

 its outer distal spine stout basally, tapered apically, its length only 

 little more than half that of segment. Segment 3, membranes and 

 processes elongated, length from base to tip exceeding that of segment 



2 and reaching far beyond end of its outer spine. Endopods unarmed; 

 the right elongate, club-shaped, reaching to beyond middle of last 

 segment; the left shorter, length about twice its own width, reaching 

 to near end of exopod 2. 



Distribution: Bermuda Islands. In cave on small ledge-like 

 island across from Agar's Island, at high tide (Esterly); in night 

 plankton haul in Grasmere Cove, near shores of Bermuda (Pinney). 



Ridgewayia gracilis, new species 

 Figures 1-27 



Specimens examined: 31 females, 40 males. Vicinity of Logger- 

 head and Bush Keys, Dry Tortugas, oft" the southwestern coast of 

 Florida, July 23-Aug. 12, 1926, Clarence R. Shoemaker. 



Types: Holotype female (alcoholic) USNM 99511; allotype male 

 (alcoholic) USNM 99512. Paratype specimens (slides and alcoholic) 

 in U. S. National Museum collections. 



