﻿COPEPOD GENUS PUPULINA (CALIGOIDA) — WILSON 249 



accessory processes large, heavily chitinized, triangular spines. Leg 

 4 without inside spines on segments 2-4, but with a cuticular process 

 on 4. 



Det<cnption. — Female (pi. 12, fig. 1) : Galapagos specimens: Total 

 length 13.9-15.0 mm. Carapace about 6 mm. long, 5.8-6.0 mm. wide. 

 Gulf of Mexico specimen : The single, nonovigerous female only 10 

 mm. in length, but otherwise like the Galapagos specimens. 



Anterior margin of carapace curved, median sinus slitlike ; posterior 

 margin nearly straight. Grooving of carapace as in pi. 12, fig. 1 ; 

 lateral lobes with long slender hairs dorsally ; each side of distal edge 

 of thoracic area set with four or five spines. Free segment about three 

 times wider than long, with short dorsal spines posteriorly. 



Genital segment joined by short neck to the free segment, rounded 

 anteriorly ; posterior processes reaching slightly beyond midpoint of 

 second segment of abdomen, ending in slender, rounded tips, diverg- 

 ing inside directly from the base of the abdomen. Sides of segment 

 and parts of dorsal surface set with very short spinules. Design on 

 dorsal surface sloping in a wavy line from the rather straight top to 

 the widened central area ; the posterior part narrowed with a marked 

 central incision of the entire bottom margin. 



Abdomen narrow and elongate, a little longer than the genital seg- 

 ment in midline ; the first segment very short and indistinctly defined ; 

 the second and anal segments plainly demarcated from each other, the 

 second twice the length of the anal ; both distal segments with a midline 

 of long, coarse hairs and scattered surface spinules ; anal segment with 

 a pair of dorsal longitudinal ridges distall}^ 



Caudal rami a little shorter than the abdomen, flattened laterally, 

 proximally with a raised longitudinal ridge; dorsal margins set 

 with coarse hairs; terminal setae very short and nonplumose, three 

 in number. Ovisacs slender, longer than the caudal rami. 



The first antenna (pi. 14, fig. 9) with a double row of stout plumose 

 setae on the upper side of the first segment and two short spines distad 

 on the lower side; the narrowed terminal segment having a slender 

 seta midway on the lower margin, and the apex set with numerous 

 short spines and varied setae (pi. 14, fig. 8). 



Second antenna (pi. 12, fig. 4) 2-segmented, basal spinous process 

 very slender, terminal claw curved inwardly, only moderately 

 elongated. Lateral prehensile hooks (pi. 14, fig. 5) comparatively 

 long and strongly curved, setae of basal papillae branched. Mouth 

 tube as described for the genus ; mandible with 12 teeth. 



The anterior accessory process of the ventral face (pi. 14, fig. 7) 

 located near the distal inner side of the inner piece of the first maxilla ; 

 consisting of a very stout spine about one-fourth as long as this portion 

 of the maxilla. The outer piece of the first maxilla (pi. 12, fig. 8) well 

 developed, its outer edge elongated and spinelike distally, reaching 



