









CYCLOPOIDEA. IQgj 



setae are a little longer than on the intermediate joints. The poste- 

 rior setae of the penult joint are as long as joint, the anterior quite 

 short ; on the antepenult joint, the anterior is very short, the poste- 

 rior less so ; the praeantepenult has the anterior seta as long as the 

 joint. 



II. Setje antennarum anticarum apicales subapicalibus non longiores. 



A. Setse caudales tot& mediocres. Frons obtusus, non elongatus. 



a. Cephalothoeax 4-articitlatus. 



Calanus PAVO. 



Frons subtriangulatus, obtusus. Cep7ialotJiorax jposticd obtusus. An- 

 tenna? anticce corpore dimidio longiores, duplo curvatce, articulo ultimo 

 longiore, setis longiusculis. Abdomen brevissimum. Styli caudales 

 breves, divaricati, setis fere corporis longitudine, latis, eleganter plumi- 

 formibus, flabellatim divaricatis. 



Front subtriangular, obtuse. Cephalothorax rather stout, obtuse 

 behind. Anterior antennae one-half longer than the body, doubly 

 curved, last joint as long as three preceding; setae rather long. 

 Abdomen very short, two-jointed; caudal stylets a little oblong, 

 divaricate, furnished with elegant spreading plumes, the plumes 

 broad and subequal, and nearly as long as body. 



Plate 72, fig. 12 a, view, enlarged ; b, second pair of antennae. 



Obtained in the Atlantic, latitude 12° north, longitude 24° west, 

 October 9, 1838, at 9 a. m. 



Length, one-twenty-fourth of an inch. Colourless, excepting a 

 large reddish spot near the centre of the body, and a similar spot in 

 each of the inner caudal plumes. Anterior segment of cephalo- 

 thorax two-thirds whole length. Caudal plumes seen only spreading, 

 as in the figure. The antennae have the anterior margin towards the 

 base uneven, and the clavate setae alluded -to, extend forward from 

 several of the joints in the first quarter of the antenna; they have a 



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