CYCLOPOIDEA. 1Q79 



Plate 74, fig. 10, animal, enlarged. 



Collected in the Atlantic, latitude 4° 30' south, longitude 25° west, 

 May 13, 1842. 



Length, one-eighth of an inch. Colourless, except some red about 

 the mouth, the articulations of the thorax, and in the posterior 

 antennae and first pair of legs. 



In the specimen, the setae of the antennae and caudal stylets were 

 partly mutilated. The species is near the G. elongatus and attenuatus 

 in habit, but the front is not at all triangulate. The body is slightly 

 and gradually narrower anteriorly, it being broadest posterior to 

 middle ; there is no abrupt narrowing posterior to the first pair of 

 antennae, as in the species just alluded to. The antennae are about 

 one and two-thirds times as long as the body. The apical setae are 

 much shorter than the apical joint, and one quite short seta, directed 

 forward, is situated some distance from the apex. 



Calanus elongatus. 



Elongatus. From breviter triangulatus, subacutus, rostro elongate et tenuiter 

 furcato. Cephaloihorax 4,-articulatus, anticd angustatus, postice ob- 

 tusus. Antennas, anticce sesqui corporis longitudine, rectos, et latissime 

 divaricatos, apicibus f route vix anterioribus, articulo pemdtimo abbre- 

 viato; setis plerumque brevibus, paucis remotis longiusculis, apicalibus 

 diffusis articulo longioribus, subapicalibus posticis longis, inazquis, 

 anticd penultimd minus dimidio breviore, anticd antepenultimd obso- 

 letd. Antennae posticce ramo minore 2-articulato. Abdomen curtissi- 

 mum. Styli caudales brevissimi. 



Elongate. Front short triangular, subacute, rostrum long and slen- 

 derly furcate. Cephalothorax four-jointed, narrowed anteriorly, 

 obtuse behind. Anterior antennae one and a half times as long as 

 body, very nearly straight quite to base, and very broadly divari- 

 cate, tips hardly anterior to line of beak; penult joint very short, 

 setae mostly short, those of the joints 3, 8, 9, 17, rather long, apical 

 diffuse, longer than apical joint, posterior subapical long, unequal, 



