CYCLOPOIDEA. 1233 



its width. The abdomen has two setae, situated somewhat dorsally 

 at the first articulation, and below there are a few minute teeth at the 

 following articulations. These articulations are indistinct, the organ 

 appearing to be one-jointed. The stylets were divergent ; their setae 

 were mutilated. 



COPILIA QUADRATA. 



Cephalothorax antich bene quadratus, fronte parce excavatus, segmentis 

 latere obtusis, postico brevissimo. Abdomen ^-articidatum, tenue, seg- 

 mentis secundo tertioque non longioribus quam primum, quarto dirni- 

 dium abdominis Jongitudine superante et lateribus parce excavato. 

 Styli caudales abdomine longiores, tenuissimi. 



Cephalothorax anteriorly regularly quadrate, the front a little exca- 

 vate, segments laterally obtuse, the last very short. Abdomen 

 four-jointed, slender, the first segment as long as second and third, 

 the fourth longer than half the abdomen and with concave sides. 

 Stylets longer than abdomen, very slender. 



Plate 86, fig. 15a, animal, enlarged; b, posterior antenna; c, under 

 view of mouth organs and first pair of legs; d, natatory leg. 



Pacific, latitude 15° 20' south, longitude 148° 20' west, obtained 

 a single individual, September 10, 1839; also, May, 1841, near longi- 

 tude 165° east, between latitude 10° and 12° north. 



This species has the sides of the anterior half of the first cephalo- 

 thoracic segment quite parallel, and consequently the head looks more 

 quadrate than in the preceding species. The third and fourth seg- 

 ments are very short compared with their width. The caudal 

 stylets were divergent; their setae were mutilated. The posterior 

 antennae have the first and second joints nearly equal in length, the 

 fourth as long as second and third. The termination of the fourth is 

 acute, or like a short spine at the extremity. The first joint appeared 

 to be naked (no setae are mentioned in my notes, or represented in 

 the figure). 



The eyes and pigment are as in the preceding species. 



309 



