38 ME. T. SCOTT ON ENTOMOSTEACA 



Length about 7 mm. Cephalotliorax rounded in front and behind. Anterior antennae 

 fully a half longer than the cephalothorax and abdomen together, 24-jointed, the first 

 joint large and bearing two plumose and a few plain seta3, the last joint long and 

 slender, furnished at its extremity with four plain setae of moderate length. The 

 second and third last joints possess longer setae than any of the other joints ; all 

 the joints from the eleventh to the twentieth inclusive bear each a number of 

 small hairs on the upper margin besides the longer setae with which all the joints are 

 more or less furnished. The proportional lengths of the joints are very nearly as in the 

 annexed formula : — 



4 5 . 10 . 10 . 10 . 10 . 10 . 10 . 10 ■ 11 . 11 ■ 15 ■ 15 . 17 ■ 18 . 22 ■ 24 . 27 . 28 . 29 . 30 . 25 . 24 . 20 . 87 

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



Secondary branch of the posterior antennse as long as the primary branch, 8-jointed ; the 

 third and last much larger than the other joints ; both branches setiferous. Mandibles 

 stout, the apex furnished with several more or less rudimentary teeth ; the mandible-palp 

 well developed ; secondary branch 5(?)-jointed, shorter than the primary, the basal part 

 furnished with three seta3 on its inner margin. Maxillae large, somewhat similar to 

 those of Micalanus, but the basal part dilated. Foot-jaws as in Eiicalanus, but the 

 terminal setae of first foot-jaws plain. The first four pairs of swimming-feet 2-branched, 

 outer branches 3-jointed, the inner branch of first pair 2-, of the others 3-jointed. 

 The outer branches of second, third, and fourth pairs only with sabre-like terminal 

 spines ; the second joint of the outer and the second and third joints of the inner 

 branches armed with transverse rows of spines. Fifth pair of feet in the male (?J 1- 

 branched, branches 3-jointed, the terminal joint longer than the other two together, 

 compressed, the extremities rounded and furnished with several long setae and two or 

 three transverse rows of small hairs as in the figure, Abdomen very short, 3(?)- 

 jointed. Caudal stylets extremely divergent, bearing four long spreading setae, two of 

 which are divided to near the base. 



Habitat. Station 2, surface and 25 fathoms tow-nettings, January 1st (night col- 

 lections). Station 3, 25 fathoms, January 2nd (day collection). Station 9, 50 fathoms, 

 January 10th (day collection). Lat. 1° 55' 5" N., long. 5' 55' 5" E., 360 and 400 fathoms 

 tow-netting, January 22nd (day collection). Station 23, 20 fathoms, February 5th (day 

 collection). 



This species was comparatively frequent all over the area examined. It is readily 

 distinguished from other Calanidce described in this Report by the remarkably divergent 

 caudal stylets, which are at almost right angles to the abdomen. The anterior antennae 

 and tail-setae appear to be, in this species, more than usually fragile ; not a single perfect 

 specimen was obtained in the whole collection. The tail-setae were commonly altogether 

 wanting or the stumps of them only remained, and the anterior antennee were, with 

 very few exceptions, all more or less damaged. It was only after very carefully searching 

 the tow-nettings that a few specimens were discovered that had the joints of the 

 antennae complete ; the figure, therefore, represents the anterior antennae perfect as 

 regards the number of joints. No specimens with perfect caudal setae were obtained. 



