387 Part [11—Highteenth Annual Report 
larger size than either Hnterocola fulgens, Van Beneden, or Enterocola 
betencourtt, Canu, and which to some extent differs also in some of its 
structural details from both these forms. I prefer, however, in the mean- 
time to regard our specimens as a ‘‘form” or variety of Van Beneden’s 
Enterocola fulgens rather than institute a new species for their reception. 
These Clyde specimens are found in the intestine—not the branchial 
cavity—of a small Ascidian. Usually only one Copepod is observed in 
each specimen of the Ascidian in which the parasites occur, and it also 
usually so fills up the part of the intestine in which it is lodged that it is 
with difficulty detached with its ovisacs 2m séw, one or both frequently 
breaking away while removing the Copepod from its environment. 
All the specimens of the Copepods obtained as described, and which I 
have examined, appear to belong to the one species, but they vary 
greatly in size. The specimen represented by the drawing (fig. 21), 
measures little more than two millimetres (2°2mm.) in length, whilst 
another that I have measured extends to at least four millimetres. The 
ovisacs are of a distinctly reddish colour, so that when examining the 
Ascidians in which the Copepods occur one can see at a glance and without 
dissection whether a parasite is present by the red colour of the ovisacs 
showing itself through the thin wall of the intestine of the host. 
The mouth-organs of the Hnterocola are difficult to make out; they 
are all simple, and do not show much structure. Figures 22 and 23 
represent what appear to be one of the antennules and one of the antenne. 
The mouth takes the form of a short and somewhat cone-shaped process. 
There appears to be no mandibles properly so called, and, according to 
Dr. Canu, the absence of mandibles is one of the distinctive characteristics 
of the genus Hnterocola. The (?) maxille (fig. 24) are broad foliaceous 
appendages, bearing on their distal margin a number of stout ciliated 
spines. The posterior foot-jaws are very stout, and terminate in very 
short but strong claw-like processes (fig. 25). 
The first four pairs of thoracic feet are all very much alike. They are 
two-branched; the outer branches appear to be one-jointed, and are 
moderately stout, and taper towards the distal end; they are also 
furnished with two moderately long and plumose terminal sete; the 
inner branches consist of short, stout, tapering appendages of a simple 
and almost rudimentary character (figs. 26 and 27). The fifth pair are 
conspicuous and broadly dilated appendages. The caudal furea aré 
about twice as long as broad. The female carries two ovisacs, which in 
well grown specimens are about as long as the body of the copepod. 
Gunenotophorus (2) globularis, Costa. (Pl. XIII, figs. 28-34 ; Pl. XTV., 
figs. 37 and 38). 
1852. Gunenotophorus globularis, Costa, Fauna del Regno di 
Napoli, Entom. (1840). 
A somewhat curious copepod, agreeing in almost every detail of 
structure with the species described by O. G. Costa under the name of 
Gunenotophorus globularis, was obtained in some dredged material from 
the vicinity of Sanda Island, Firth of Clyde, in December 1898. The 
species is said to occur in the branchial cavity of Ascidians, but this 
Clyde specimen (only one was obtained) occurred free amongst the 
dredged material, having probably come from a dredged Ascidian. 
The entire length of the specimen was about five millimetres (about oue- 
fifth of an inch). The body was considerably dilated, but the abdomen 
was more slender, and was quite distinct ; the whole animal was strongly 
incurved, as shown by the figure (fig. 28, Pl. XIII). The specimen, which 
had a somewhat macerated appearance, did not exhibit much segmentation 
