82 MR. T. SCOTT ON ENTOMOSTRACA 



organs ?), densely ciliated at the extremity ; posterior foot-jaw in the female slender, 

 (j-jointed, the last two joints very small. Three long setaj, plumose along the upper 

 edge, spring from the terminal joints ; the basal joints are sparingly setiferous ; the 

 posterior foot-jaw is stouter in the male, and the terminal joints bear a much larger 

 number of setae. First pair of swimming-feet 2-branclied, the outer 3-jointed, the inner 

 2-jointed ; both branches with numerous stout plumose setge, the terminal spine of the 

 outer branch slender, and faintly serrate on the outer margin. The inner branch of the 

 second pair 2-jointed, of the third and fourth pairs 3-jointed and armed on the side with 

 fascicles of short, stout, and sharp-pointed spines ; the outer branches foliaceous and 

 bearing several strong spines on the exterior margin, one at the base of the first and 

 second joints, and three on the last joint ; the terminal spines of the outer branches of 

 the second, third, and fourth pairs broad, falciform, the outer margin faintly serrate. 

 The fifth pair wanting in the female, in the male simple, 1-branched, 5(?)-jointed, the 

 left branch longer and stouter than the right, with the last joint small and fringed with 

 hairs ; the right branch terminates in a slender spine. Abdomen in the male 5-, in the 

 female 4-jointed, the last joint the smallest. Caudal stylets short, divergent, and 

 furnished with several plumose seta3, the second seta fi'om the inside being much longer 

 than the others. 



Habitat. Station 9, 25 and 50 fathoms, January 10th (day collections). Lat. 1 55' 5" N., 

 long. 5" 55' 5" E., 35, GO, and 360 fathoms, January 22nd (day collections). Station 23, 

 surface, 20 and 85 fathoms, February 5th (day collections). These were the only 

 gatherings in which Fhaenna spinifera was obtained. 



The ciliated processes of the anterior foot-jaws resemble somewhat the worm-like 

 sense-organs of the same appendages in Scolecithrix, but instead of being produced so 

 as to form lengthened hair- or " worm-"like processes, as in that genus, they are 

 cylindrical and truncate, and furnished with a terminal fascicle of delicate cilia. 



Subfamily Pontellin.T3, Dana. 



Genus Labidocera, Lubbock, 1853. 



PonteUa, Dana, (in imrt), Amcr. Joum. Sci. 184-6; Claus, Die freilebeuden Copep. 1803; Brady, 



Monogr. Brit. Copep. 1878 ; id. Report Chall. Copep. 1883. 

 Labidocera, Lubbock, Ann. & Mag. Nat. Hist. ser. 2, vol. xi. (1853). 



Labidocera detrtjncata (Dana), var. intermedia. (PL VI. figs. 36-38 ; PI. VII. 

 figs. 3, 4.) 



Length 3 mm. Ccphalothorax elongate-ovate, the postero-lateral angles of the last 

 thoracic segment produced, acute. Anterior antennge in the female 23-jointed, the 

 upper margin of the first eight or nine joints furnished with moderately short, plumose 

 seta3, and the lower margin with a fringe of delicate hairs extending to the 12th joint. 

 Right anterior antennse of the male 17-jointed, hinged between the 13th and 11th 





