G. 0. Sårs. [No. 4 



and expanded laterally; caudal rami broad, with one of the apical 

 setæ transformed into a thickish spine. Urosome of male slender, 

 5-articulate, with the caudal rami normal, and none of the apical 

 setæ transformed. Front provided below with 2 slender recurved 

 tentacular filaments. Anterior antennæ in female about as in Acartia; 

 right antenna in male, however, very much transformed, and built 

 up on the same type as in the Pontellidæ. Posterior antennæ, oral 

 parts and natatory legs of a structure similar to that in Acartia. 

 Last pair of legs, however, rather different, those in female with 

 the basal parts confluent, terminal joints spiniform, those in male 

 very powerfully developed, right leg much the larger and termin- 

 ating in a slender incurved claw. Spermatophore affixed to the ge- 

 nital segment of the female, constantly accompanied by a thin plate 

 folding more or less upwards on each side. 



EemarJcs.— This genus was established in the year 1894 by 

 Th. Scott, to include 2 supposed species, P. spinicaudata and P. 

 dubia, found in some Plankton-samples tåken in the Gulf of Guinea 

 by Mr. John Rattray during the Expedition of the Telegraph 

 Steamer "Buccaneer". As suggested by Dr. Giesbrecht, however, 

 these two forms ought undoubtedly to be combined in one, the 

 P. spinicaudata representing the female, and the P. dubia the male 

 of one and the same species, to which the latter name has been 

 assigned by Dr. Giesbrecht in his recent synopsis of the Calanoida 

 (Gymnoplea). The name Paracartia was originally proposed by 

 Th. Scott merely to designate a subgenus of Acartia. I think, 

 however, that the differences are great enough to warrant the 

 establishment of a true genus, which will find its place in the 

 family Acartiidæ, as defined by the present author in his work on 

 the Norwegian Calanoida. In addition to the typical species and 

 the one described below, the Acartia latisetosa of Kriczagin (= A. 

 verrucosa Thompson) is undoubtedly referable to the present genus. 



Paracartia Grani, G. 0. Sårs. 



Specific Characters. — Female. Body rather slender, with the 

 anterior division scarcely at all tumefied, tapering gradually in front; 

 wing-like expansions of last segment very large, triangular, each 

 terminating in an acute point. Urosome short and broad, constricted 

 in the middle, genital segment about the length of the other 2 com- 



