new and rare British Copepoda. 359 
? Enterocola Beaumonti, sp. n. 
(Pl. XVI. fig. 9; Pl. XVI. figs. 9-12.) 
Description.—Female. Length 2*2 millim. (j; of an inch). 
Body composed of five segments, seen from above stout and 
subcylindrical, the anterior half tapering slightly towards the 
broadly rounded forehead ; the last body-segment with two 
stout tubercles at the distal end, one on each side of the 
dorsal aspect; abdomen short, subtriangular, three-jointed ; 
caudal stylets in the form of two short, divergent, and pointed 
tooth-like processes (Pl. XVII. fig. 9). Seen from the side 
the last body-segment is strongly gibbous on the posterior 
dorsal aspect (Pl. XVII. fig. 10). Antennules short and 
stout, four-jointed ; the first is about twice the entire length 
of the other three ; the last is very short (Pl. XVII. fig. 11). 
Antenne three-jointed ; the first joint, which bears two tooth- 
like spines near the middle of the inner edge, has the base 
dilated, but tapers rapidly towards the distal end; the second 
joint is about three times longer than broad, and has the inner 
margin obscurely three-toothed ; the last joint, which is small, 
forms a stout tooth-like claw (Pl. XVII. fig. 12). Posterior 
foot-jaws strong; first joint stout and rather longer than 
broad, the second and third short; the third joint is armed 
with a short but strong terminal claw (Pl. XVI. fig. 9). 
There are four pairs of thoracic teet, all or which are some- 
what similar in structure, and resemble those of the next 
species ; they each consist of a short and dilated basal joint, 
to the upper part of which is attached a single two-jointed 
branch ; the first joint of the branch is moderately stout and 
elongate, the second joint is short and has two claw-like 
processes on the outer aspect, as shown by fig. 8 (Pl. XVIL.), 
which represents one of the fourth pair of Hnterocola hiber- 
nica. 
Habitat. Taken from an Ascidian, obtained at Valentia, 
Treland. 
Remarks. This Ascidian parasite somewhat resembles a 
form obtained by us in the Firth of Forth in 1891, and 
described and figured in the Ann. & Mag. Nat. Hist. for 
September 1892; it differs, however, very distinctly in the 
structure of the antennules, and the dorsal processes on the 
last body-segment are much less developed ; it also differs in 
the structure of the thoracic feet, and is likewise a smaller 
species. 
This and the following parasites were discovered by 
Messrs. W. I. Beaumont, B.A., of Cambridge, and F. W. 
Gamble, M.Sc., of Owens College, Manchester, whilst’ 
