﻿COPEPOD GENUS PUPULINA (CALIGOIDA) — WILSON 251 



As my findings disagi-ee with some of those of C. B. Wilson (1935a) , 

 the following summary of the armature of legs 1-3 is given (sp= 

 spine; se=seta; lam = lamina) : 



I. PS 1 



Les 2 



Basal segment of leg 4 (pL 12, fig. 20) with small spines on anterior 

 and posterior margins ; second segment with similar spines along outer 

 margin ; none on margins of segments 3 and 4. Terminal outer spines 

 of segments 2 and 3 about as long as the succeeding segment, inner 

 spines lacking. Distal end of fourth segment with three stout spines 

 and one slender spine, the outermost shorter than the segment, the next 

 as long as, and the third a little longer than the segment ; the inner 

 spine attached laterally, slender, curved, reaching beyond the end of 

 the segment by one-half its own length; a thin, cuticular process, 

 spinelike distally, present at about the middle of the inner margin. 

 All large major spines of the leg coarsely toothed, the longest of the 

 terminal segment having some of the teeth considerably enlarged on 

 the inner margin, with three stout additional teeth on the outer side. 



Male (pi. 12, fig. 3) : Total length 11.4-12.1 mm. Carapace about 

 equal in length and greatest width, 5.1-5.4 mm. ; cephalothorax about 

 5.8-6.0 mm. long. Posterior part of body averaging 5.8 mm. in length ; 

 of this the approximate divisions are : genital segment, 1.3 mm. ; ab- 

 domen, 1.9 mm.; caudal rami (exclusive of setae), 2.6 mm. The 

 caudal rami are therefore longer than the abdomen, but are shorter 

 than the genital segment and abdomen combined. None of the speci- 

 mens, including the allotype (kindly measured for me by Paul Illg, of 

 the United States National Museum), exhibit the condition described 

 and figured by C. B. Wilson (1935a, p. 597) in which "the caudal 

 rami are as long as the entire body behind the carapace." 



Carapace similar to that of female except that the medial posterior 

 edge is somewhat curved. Free thoracic segment little more than 

 twice as wide as long; posterior part considerably widened at midline, 

 with long, stifi: marginal hairs. 



Genital segment with sides slightly rounded, set with conspicuous 

 spinules, both marginally and on dorsal and ventral surfaces; four- 

 fifths as wide as long; posterior corners produced dorsally, well 

 rounded ventrally. Basal segment of abdomen distinctly set off; 



