26 Mr. I. C. Thompson on the Copepoda 
Lucicutia Clausi, Giesbrecht. 
1889, Leuckartia Clausii, Giesbrecht, Atti Acc. Lincei Rend. ser. 4, 
vol. v. p. 812. 
A few specimens of this species were taken at 510 fathoms. 
Its previously known range is the Mediterranean and Pacific 
Ocean. 
Isocheta longisetosus, sp.n. (Pl. VII. figs. 1-9.) 
Female.—Uength 3°50 millim. Cephalothorax has five 
segments. Rostrum appears to consist of two long, narrow, 
ribbon-like bodies. Anterior antennz 23-jointed, the relative 
lengths bemg much as follows :— 
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G289299999 8 BSB B8BAAA SL 4 EBs 
They are sparingly setiferous. Hach antenna has a dark 
brown seta on last jomt, The two branches of posterior 
antennee (fig. 2) are of about equal length ; the outer branch 
8-jointed, the fourth to seventh joints bemg a compound joint; 
the eighth joint nearly as long as the other seven together. 
From the compound joint spring a number of flat ribbon-lhke 
hairs, which, like the apical hairs, appear to be filled with 
very minute round granules. The inner branch springs 
from the basal joint at right angles to the outer, and termi- 
nates with six or eight very long ribbon-like setz, also dark 
brown and granular. Mandible (fig. 3) has a main branch 
of three joints, terminated by long, brown, flat sete, as 
described above. Twosmall segments, each terminated by a 
long slender spine, spring from the middle jot; from the 
basal joint arisesashort stout branch, ending with spinous sete, 
which appear to take the place of any biting-teeth. Maxilla 
(fig. 4) consists of two small 2-jointed branches proceeding 
from acommon base, their terminal joints ending in several of 
the long granular setze as described above. Anterior foot- 
jaws (fig. 5) long and broad, with two long spines at apex of 
each of two protuberances on first jomt. Three very small 
terminal joints are also provided.with long curved spines. 
Posterior foot-jaws (fig. 6) 7-jointed, long spines springing 
from each ; there are also several small spines on the third and 
fourth joimts. Abdomen 4-jointed; the first joint is nearly 
twice the size of any of the others; caudal setze without the 
dark granular coloration. Outer and inner branch of the 
swimming-feet (figs. 7 & 8) are all 3-jomted, with the ex- 
ception of the fifth pair (fig. 9), the imner branch of which is 
2-jointed. 
ES ee 
