COPEPODS OF THE WOODS HOLE REGION" 199 



as wide as metasome; genital segment not divided; abdomen 3-seg- 

 mented in female, 4-segmented in male ; caudal rami short and wide. 

 First antennae slender, 8-segmented, geniculate in male; endopod of 

 second antennae 3-segmented, exopod 2-segmented; mandibular palp 

 biramose, maxillary palp only slightly lobular ; second maxillae and 

 maxillipeds both uncinate ; endopod of first legs 2-segmented, exopod 

 3-segmented, both rami natatory and not prehensile; rami of second, 

 third, and fourth legs 3-segmented ; fifth legs 2-segmented, basal seg- 

 ment without an inner expansion, distal segment narrow-elongate. 

 Two ovisacs, oviducts opening dorso-laterally. 



Genotype. — Gliaypaquiddicka pulchella^ new species. 



CHAPPAQUIDDICKA PULCHELLA, new species 



Plates 1?j, 4 



Occurrence. — Both sexes found in considerable abundance among 

 the algae in two of the brackish ponds of Chappaquiddick Island, 

 July, 1925. The male holotype is U.S.N.M. No. 63424. 



Color. — Body transparent, tinged with faint yellow, a triangular 

 spot behind the eye, an elongated triangular area on either side of 

 the head pointing diagonally backward, and the anterior margins of 

 the second, third, and fourth metasome segments vermilion-red. 

 Narrow bands of the same color extend across the genital and ab- 

 dominal segments. This color also extends around the posterior 

 margins of the epimeral plates of the third and fourth thoracic seg- 

 ments and appears on the f ronto-lateral margin of the head and on 

 the anterior surface of the upper lip. Eye ruby red, the lenses 

 colorless and sparkling like diamonds. Ovaries and oviducts bright 

 bluish green; eggs also bluish green, in a single layer in each ovisac. 



Female. — Metasome elongate-ovate, a little more than twice as 

 long as wide, and strongly vaulted dorsally; head fused with the 

 first segment and almost exactly half the length of the metasome; 

 second and third segments the same width as the head, fourth seg- 

 ment slightly narrower, fifth segment abruptly reduced to half the 

 width of the fourth. Urosome a little more than half the length 

 of the metasome, the same width as the fifth metasome segment, 

 only slightly tapered posteriorly. Genital segment as long as the 

 three abdominal segments combined, with no signs of a division; 

 abdomen 3-segmented, the segments diminishing slightly in length 

 and width posteriorly ; caudal rami half the length of the anal seg- 

 ment, as wide as long, each tipped with two long setae, the inner of 

 which is as long as the urosome. First antennae reaching the center 

 of the second thoracic segment, 8-segmented, the second, third, and 

 fourth segments elongate and widened, the terminal portion (four 

 end segments) no longer than the fourth segment. A long aesthe- 



