COPEPOD GENUS RIDGEWAYIA — WILSON 145 



Ridgewayia canalis (Giirney), new combination 



Suezia canalis Gurney, 1927, p. 457, fig. 109. 



Diagnosis (after Gurney) : Female: Unknown. Male: Length (2 

 specimens), 0.72, 0.74 mm. Body form "cyclopoid," metasome 

 6-segmented, lateral wing of last segment with small, backwardly 

 directed tooth. Rostrum pointed. Urosome 4-segmented, fifth seg- 

 ment said to be "scarcely distinct." 



Antennule reaching to about end of metasome; segmentation said 

 to be "indistinct," of 21 or 22 segments; the right not prehensile. 

 (No du-ect reference made to left antennule.) Exopod of antenna 

 7-segmented. Mandible palp as for genus. MaxUlule undescribed. 

 Maxilla shorter than segment 1 of maxilliped; with five inner setiferous 

 lobes, of which one belongs to basal division; apical portion of two 

 segments. Maxilliped as for genus (setae of basal segment appear to 

 be incompletely shown in illustration) . 



Leg 1 (from fig. 109f): No inner seta shown on basipod 1; present 

 on basipod 2. Exopods 1 and 2, outer margin with distal, serrate 

 process, that of second segment about half length of outer spine. 

 Exopod 3, inner apical spine shorter than segments 2+3, about 14: 18. 

 Endopod 1, outer margin with stout, partially separated lobe (as in 

 new Tortugas species) . Spines and setae as given for the genus. 



Leg 2 with inner seta on basipod segment 1; setation of exopods 

 and endopod as given for the genus (see also p. 169). 



Legs 3 and 4 unknown, except that the rami are 3-segmented and 

 the exopod spines lack hyaline membranes. 



Leg 5 (from fig. 109h,i) : No spines or setae shown on basipods; 

 first basipod segments at least partially separated by connecting 

 plate; right and left basipods of nearly equal length. Right exopod 2, 

 outer margin with one spine set near proximal fourth of segment, the 

 inner margin incised at this point and the segment narrowed and 

 tapered, forming an incurved prolongation; outer margin with two 

 minute spinous points at middle and near tip of segment. Left leg 

 shorter than right. Outer spine of exopod 1 reaching to near end of 

 leg, evenly tapered, with wide, serrated fringe. Exopod 2 produced 

 into stout lateral spinous point inside of which is a modified spine 

 ornamented with outer hyaline flange and inner basal process (com- 

 parable to outer spine of other species?) . Inside this modified spine, 

 a shorter produced portion of the segment shown as partially sepa- 

 rated on the anterior side, divided into an outer, seemingly flattened 

 structure with bifid tip, and an unmodified segmental inner portion 

 (this appears to represent a reduced third segment, less complex in 

 structure and armature than that of the other species). Endopods 

 modified as in other species of the genus. The right elongate, reach- 



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