26 ME. T. SCOTT ON ENTOMOSTEACA 



l)ut was> nevertlieless, -widely though sparingly distributed throughout the greater part of 

 the area examined. The specimens obtained were mostly females, and were readily 

 distinguished from the other species of Calanns by the long anterior antenntie and the 

 peculiar terminal spine of the first swimming-feet. 



? Calanus comptus, Dana. (PI. V. figs. 46-50; PI. VI. figs. 1-5.) 

 1853. Calanus comptus, Dana, Crust. U.S. Expl. Exped. p. 1050, pi. Ixxii. fig. 2a. 

 Hale. Length, exclusive of tail-setae, 3'3 mm. Body composed of sis segments, the 

 first as long as the entire length of the other five. Anterior antennae scarcely longer 

 than the cephalothorax, 23-jointed, and very sparingly setiferous ; the proportional 

 lengths of the joints are nearly as in the formula : — 



36 . 6 . 6 . 7 . 8 ■ 8 . 7 ■ 8 . 11 . 12 ■ 13 . 17 . 18 . 20 . 20 ■ 21 . 22 . 22 . 18 ■ 10 . 18 . 19 . 10 

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23' 



Posterior antennae and mouth-organs nearly as in Calanus fimnarcliicus. The first 

 four pairs of swimming-feet closely resemble those of Cal. gracilis, Dana, the peculiar 

 terminal spine of the outer branches of the first pair in both species being almost 

 identical. The fifth pair also resemble those of that species, as figured in the ' Challenger ' 

 Copepoda, except that the small secondary branch is 3-jointed. Abdomen short, 

 5-jointed, the second segment rather longer than any of the others. Caudal stylets 

 short. 



Habitat. Lat. 6° 34' N., long. 12° 39' W,, surface collection. One or two specimens 

 only were obtained. 



This Calamis so closely resembles Calanus gracilis in many respects that I am inclined 

 to consider it as simply a variety of that species. 



Genus Paracalanus, Boeck (1864). 



Paracalantjs parvus (Claus). (PI. I, figs. 9-14.) 



18G3. Calanus parvus, Claus, Die freilebendeu Copepoden, p. 173, t. xxvi. figs. 10-14, t. xxvii. figs. 1-4. 



1864. Paracalanus parvus, Boeck, Oversigt Norges Copepoder, p. 232. 



Length 1"12 mm. Cephalothorax elongate-ovate, rounded in front and behind. 



Anterior antennae reaching to the end of the caudal stylets, 24-jointed ; the proportional 



lengths of the joints are as follow (antennae the same in both sexes) : — 



35 ■ 25 ■ 12 . 12 . 10 . 10 . 12 ■ 13 . 10 . 10 . 10 . 13 . 12 . 13 . 15 . 15 . 15 . 15 . 15 . 15 . 13 . 14 . 15 . 27 

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24* 



Posterior antennae and mouth-organs as in Calanns. The inner branch of the first 

 pair of swimming-feet 2-jointed, about as long as the first two joints of the outer 

 branch ; the basal joint of the peduncle bears a stout plumose seta near the inner distal 

 angle. The basal joints of both branches of the fourth pair are small, the second and 

 third joints of the inner branch and tlie second joint of the outer branch are furnished 

 on the side with an armature of spines as in the figure (fig. 11), and the outer margin of 

 the last joint of the outer branch is distinctly dentate from the base to the first marginal 



