﻿COPEPOD GENUS PUPULINA (CALIGOIDA) — WILSON 247 



lobes; dorsal surface with a large medial clear area in which the 

 integument is considerably thinner than that surrounding it, creating 

 in the mature forms a characteristic design for each species. Abdomen 

 narrow and elongate in both sexes, 3-segmented in the female, the divi- 

 sion between the first two segments sometimes indistinct; 2-segmented 

 in the male. Caudal rami linear in male; either linear or short and 

 broad in female ; terminal setae very short, sparsely plumose or naked. 



Second antenna of female with either two or three segments well 

 defined, apical claw stout, basal segment with a strong, posteriorly 

 directed spinous process; that of male 3-segmented, tipped with a 

 stout claw and armed variously with laminae and spines. Prehensile 

 lateral hooks present, the basal portion bearing posteriorly two papil- 

 lae armed with branched or simple setae. 



Oral appendages similar to those of the Caliginae. Mouth tube in 

 female constricted near the middle, its greatest width a little more 

 than half the length of the entire tube; the whole more slender and 

 hardly constricted in the male; opening subterminal. Mandible 4- 

 segmented, segments 2 and 3 imperfectly defined, claw heavily chitin- 

 ized, with teeth on the inside margin only. 



First maxilla consisting of two heavily chitinized pieces and a very 

 small, membranous papilla, the outer chitin piece having its outside 

 edge more or less produced distally, being extended in the genotype 

 into an elongated process; the inner piece (usually referred to as 

 endopod by recent writers) extended posteriorly into a slender spine- 

 like process, in the male either branched distally or bearing an articu- 

 lated spine. The papilla (the exopod of recent writers) arising from 

 the ventral face between the basal portions of the two chitin structures ; 

 bearing three comparatively short setae which exhibit sexual as well 

 as pronounced specific differences. Second maxilla elongated; first 

 segment imperfectly defined, represented by a slightly enlarged basal 

 portion ; third segment very slender, with two thin, curving, terminal 

 claws, the posterior of which is much shorter than the other. Maxil- 

 liped of female with short terminal claw, not more than half the length 

 of basal segment ; male having claw a little longer and the basal seg- 

 ment variously armed. 



Two pairs of accessory processes arising from the ventral face, 

 sexually similar. The anterior pair spinelike, situated near distal 

 end of the inner chitin piece of the first maxilla. The posterior pair 

 heavily chitinized or membranous, shape specifically variable, located 

 behind the base of the maxilliped, directly opposite the posterior 

 supporting lateral ribs of the carapace, but in nowise connected with 

 them or with the central area usually occupied by the furca, which is 

 lacking. 



Legs 1-3 biramose. Leg 1 with both rami 2-segmented, the endopod 

 well developed ; the inside spine of the second exopod segment charac- 



