456 Part III.—Twentieth Annual Report 
than broad, widest in the middle. The cephalo-thoracic segment scarcely 
distinct, being indicated by a simple constriction; thoracic segments all 
coalescent. Abdomen very small, and apparently consisting of two 
somites ; the first somite is short but moderately broad ; the second is also 
short, and tapers abruptly to the slightly bilobed extremity. Caudal 
furca extremely small. Ovisacs (two) large (fig. 8). 
The antennules are short, moderately slender, and five-jointed ; the first 
and the last three are sub-equal in length, but the second is about one 
and a half times the length of the third; all the joints are sparingly 
setiferous (fig. 9). 
The antenne are short and three jointed, the end joint is armed with 
one small marginal and three or four stout terminal spines, which are 
slightly hooked (fig. 10) ; they are not provided with secondary branches. 
The mandibles are large and elongated; proximally they are some- 
what dilated, but they taper gradually to the distal] extremity, where they 
are armed with two rows of short but stout tooth-spines as shown in the 
drawing (fig. 11). No maxille could be observed. 
The first and second maxillipeds are very stout but of a somewhat 
rudimentary structure ; the terminal claws are very short, but stout and 
tooth-like (figs. 12, 13). No thoracic feet were observed. 
Halitat.—Parasitic on specimens of a marine annelid, Hulalia viridis 
(Ersted, dredged by the “Garland” in 55 to 65 fathoms in Loch Etive, 
west coast of Scotland, on September 17th, 1901. Several specimens, 
including old and young, were observed ; one or two of the specimens 
occurred still adhering to fragments of the annelid, on which they 
appeared to be able to take a very firm hold. 
At first I was not sure but that these Loch Etive specimens might 
belong to the same species as those found by Professor M‘Intosh on Wereds 
cultrifera, Grube,* on the shores of the Channel Islands. I therefore 
sent a specimen to him for his opinion as to whether it was the same as 
those he had discovered ; in replying to me he pointed out certain differ- 
ences observed by him, and also very kindly sent me an example of the 
form from the Channel Islands so that I might more easily observe the 
differences he referred to. He stated further that the form found by 
him was the Wereicola ovata described by Keferstein in 1860.7 Iam 
also indebted to Professor M‘Intosh for the name of the annelid from Loch 
Ktive on which the copepods described here were obtained. 
The difference in the form of immature specimens of Nereicola concinna 
from that of similar specimens of VV. ovat is even more marked than in 
the adults (fig. 14). 
HARPACTICIDA. 
Eucanuella spinifera, T. Scott. 
1901. Eucanuella spinifera, T. Scott, 19th Ann. Rept. Fishery 
Board for Scotland., pt. ili., p. 245, pl. xvii, figs. 1-10. 
This species, described in Part iii. of the 19th Annual Report, has 
again been observed in a gathering of bottom material collected to the 
east of the Shetland Islands in 60 to 70 fathoms on May 22nd, 
1901. Hucanuella is apparently a deep-water species. 
*On a Crustacean parasite of Nereis cultrifera, Grube, by W. C. MacIntosh, M.D., 
Micr. Journ,, vol. x., N.S., p. 39, pl. v. 
+ Zeit. f. w. Zool., bd. xii. (1860), taf. xliii., f. 1-4, p. 461. 
