92 ME. T. SCOTT ON ENTOMOSTEACA 



The under-surfoce tow-nettings included eighteen gatherings from 2i to 50 fathoms, 

 and one at 185, 235, and 460 fathoms. This species appeared to be distributed all over 

 the area examined, and was comparatively frequent m some of the gatherings ; females 

 with ovisacs were not uncommon. 



Canthocamptus rosens, Dana, probably belongs to this species. Dana's description 

 (so far as it goes) and figure agree with Microsetella atlantica, but the descrij)tion is 

 too meao-re to admit of a satisfactory comparison. There is a difference between the 

 two as reo-ards size and colour, but such differences are not of much value unless allied 

 with structural differences. 



Genus Ectinosoma, Boeck. 



Ectinosoma, Boeck, Oversigt Norges Copepodei-, ISQi. 

 Ectinosoma, Brady (in part), Mon. Brit. Copep. vol. ii. p. 10. 



Ectinosoma Chrystalii, n. sp. (Pi. IX. figs. 26-35.) 



Length 1 mm. Body robust ; anterior antennse short, stout, furnished with numerous 

 long setfe; 6-jointed, the third joint is somewhat longer than either the preceding or 

 following ; the last is smaller than the others and about two-thirds the length of the 

 penultimate joint, truncate at the apex, and furnished with three long apical sctse. The 

 long middle joint of the posterior foot-jaw is setose on the ujiper edge, and a long plumose 

 seta that extends beyond the apex of the foot-jaw springs from the upper distal angle of 

 the first joint ; last joint short, provided with three seta3 (fig. 34). The second basal 

 joints of the first pair of swimming-feet are furnished interiorly with a setose spine that 

 extends nearly to the middle of the second joint of the inuer branches ; the outer 

 branches, which are comparatively short, reach only to the end of the second joint of the 

 inner branches, and the spines on the exterior edge are elongate and sharp-pointed, other- 

 wise the first pair closely resemble those of Ectinosoma spinipes. The second basal joint of 

 the fourth pair is somewhat produced and armed exteriorly with an elongate setose 

 spine ; the branches of tlie fourth pair are nearly of equal length, and armed similar to 

 the first pair, except that the exterior marginal spines of the outer branches are not 

 elongate nor setose. Eifth pair nearly as in Ectinosoma melaniceps, Boeck. Caudal 

 stylets about equal in length to the last abdominal segment; the inner of the two 

 principal caudal sctoe considerably longer than the other. 



Sahitat. Station 3 (lat. T 1' 1" N., long. 15' 54' W.), 25 fathoms, collected between 

 9 A.M. and 5.30 p.m., January 2ud. 



Several specimens, all females, were obtained in this gathering. The species is 

 named after Professor Chrystal, who designed a tow^-net used in collecting some of the 

 material from which the Copepoda described in this Report were obtained. 



Genus Bradya, Boeck, 1872. 

 Bradya, Boeck, Nye Stegter og Arter af Saltvands-Copepoder, 1872. 

 Bradya brevicornis, sp. n. (PI. IX. figs. 36-43.) 

 Length 88 mm. Somewhat similar in form to Bradya typica, Boeck. Anterior 



