CYCLOPOIDEA. HQ§ 



Collected a few individuals, November 7, 1838, at 4 A. M., in the 

 Atlantic, latitude 4° south, longitude 21° west. 



Length, one-eighth of an inch. The furcate beak is quite long. 

 The caudal setae are nearly equal, the first being but little shorter 

 than the second. The setae of the anterior antennae are short, the 

 apical quite short; the long posterior subapical are furnished with 

 short distant ciliae on the outer side, which move on their base when 

 the antenna is agitated in the water. The setae on the longer branch 

 of the posterior antennae are longer than the antennae. Natatories 

 five pair and subequal; the posterior dissimilar. Two rows of large 

 globular masses extend along nearly the whole length of the cephalo- 

 thorax, which have a greenish colour and bright reflections; the pos- 

 terior masses oblong, and largest. Abdomen four-jointed, first joint 

 oblong. 



This species is in some points near the Cetochilus septentrionalis of 

 Goodsir, described in Jameson's Edinb. New. Phil. Jour., 1843, vol. 

 xxxv. pp. 102 and 336. 



Cyclopsina longicomis, Dana, Proc. Amer. Acad. Sci., ii. 24. 



Hemic al anus calanijstus. 



Gracilis. Front triangulatus. Cephalothorax posticd obtusus, Q-articu- 

 latus, capite vix discrete-, segmentis posticis cequis. Antennas anticce 

 corpore longiores, tenuissimce, rectiusculce, apicibus fronte non poste- 

 rioribus; setis brevibus, apicalibus anticis articuli longitudine, subapi- 

 calibus totis valde brevioribus; antenna maris dextra medio leviter 

 incrassata. Styli caudales elongati, divaricati, setis subcequis, divari- 

 catis. 



Slender. Front triangular. Cephalothorax obtuse behind, six-jointed, 

 the cephalic articulation not distinct, four posterior segments sub- 

 equal. Anterior antennae longer than the body, very slender, 

 nearly straight, the tips not behind line of beak; setae short, the 

 anterior apical as long as the last joint, the subapical all much 

 shorter, right of male nearly terete, the joints not blended, but little 

 enlarged. Caudal stylets half as long as abdomen, slender, divari- 

 cate, setae spreading, subequal. 



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