128 Messrs. Brady and Robertson on Marine 



Genus Centropages, Kroyer. 

 1. Centropages typicus, Kroyer. 



Frequently taken in the surface-net in the open sea, but 

 never in any great abundance. 



2. Centropages hamatus (Lilljeborg). 



Taken in similar situations to the foregoing, and often in 

 company with it. 



Genus PSEUDOCYCLOPS, Brady *. 



Forma Cyclopi similis : antennae anticae mediocres, multiarticulatae, 

 maris dextra in medio tumefacta non genicnlans ; antennae postica? 

 parvee biramosae ; mandibularum palpus biramosus ; maxilla 

 et maxillipedes iis ParacaJani fere similes ; pedes quinti paris 

 famince, biramosi, maris complexi, laminati, spinosi. 



Though distinctly Cyclopoid in general appearance, this 

 curious genus, like the Misophria of M. Boeck, exhibits a 

 distinct affinity to the Calanidas in the structure of its mouth- 

 apparatus: this, taken in conjunction with the biramose second 

 antenna and the structure of the fifth pair of feet in the female, 

 has induced us to transfer it to the position it here occupies. 



M. Boeck thinks that this genus belongs to the male of his 

 Misophria ; but in this opinion we are unable to agree. Of 

 the species described in a previous paper, Pseudocyclops crassi- 

 remis, it is true that we found only the male ; but of that here 

 noticed we have taken many specimens, both male and female. 

 From Misophria the genus is clearly distinguished by several 

 characters, notably the following : the basal joint of the 

 secondary branch of the posterior antenna is excessively broad 

 and truncate, the succeeding joint or joints being very narrow, 

 and the fifth foot in the female is distinctly two-branched, 

 each branch being triarticulate. 



Pseudocyclops obtusatus, n. sp. PL VIII. figs. 4-7. 



Cephalothorax very tumid, obtusely rounded in front down 

 to the rectangular and almost obsolete rostrum ; dorsum 

 strongly arched ; first segment very large, nearly equal in 

 length to half the cephalothorax ; abdomen slender, in the 

 male five-, in the female four-jointed. Anterior antenna? 

 eighteen-jointed, stout, and about equal in length to the first 

 cephalothoracic segment ; basal joints (except the first) ex- 

 tremely short, gradually increasing in length to the terminal 

 joint, which is twice as long as broad, closely beset on the 



* Ann. & Mag. Nat. Hist, 1872, vol. x. p. 7. 



