238 Part 111.—Nineteenth Annual Report 
locality, also in the West of Scotland, viz., in the Sound of Mull, where it 
was collected by the “Garland” in 72 fathoms on March 31st, 1900. 
This record shows that, though the species may be rare, its distribution in 
Scottish waters is probably fairly extensive. 
Aitidius armatus, G. 8. Brady. 
A few specimens of this curious species were obtained in tow-net 
gatherings collected to the eastward of the Fair Island in October, 1900, 
but they were all females, and in connection with this it is interesting to 
note that the specimens in the collections made by H.M.S. “ Research ” 
in the Shetland-Farde Channel in July and August, 1896, were also all 
females.* In tidius armatus the bifid rostrum with its steut spine-like 
branches, which projects from the front of the head at nearly right 
angles to the body, appears, when seen in profile, not unlike the beak of a 
bird. It was this character of the rostrum which suggested to Dr. Brady 
the name of the genus.t 
Bradyidius armatus, Vanhoffen. 
This species was collected with the tow-net in October, 1900, off the 
Fair Island. 
Scolecithrix hibernica, A. Scott. 
This species, which was discovered in the Irish Sea by my son, and 
which has been observed in the Firth of Clyde and the Moray Firth by 
myself, has now to be recorded from a new station—viz., about fifty 
miles south-south-east of the Fair Island, between Orkney and Shetland. 
It occurred in a gathering collected with a tow-net fixed to the head of 
one of the trawls of the steam trawler “St. Andrew,” on October 16th, 
1900, while that vessel was engaged in carrying on the investigations 
referred to in the preliminary remarks. This is the farthest north of 
any of the localities where S. hibernica has yet been observed. 
CENTROPAGID&. 
Centropages typicus, Kroyer. 
Specimens of this species were obtained in Lerwick Bay, Shetland, 
by the steam trawler “ St. Andrew” while at anchor there in October 
last. It was also observed to be moderately frequent off the Fair Island 
on the 19th of the same month. 
Centropages hamatus (Lilljeborg). 
This Centropages occurred in a tow-net gathering collected in Lerwick 
Harbour about the same time as the specimens of C. typicus were 
collected. 
Eurytemora afinis (Poppe). 
This Copepod occurred in great abundance in some of the hatching 
boxes at the Sea-Fish Hatchery at Bay of Nigg, at the end of the hatching 
season last year (1900). , 
* Notes on the Animal Plankton from H.M.S. ‘‘ Research.” fifteenth Annual Report 
of the Fishery Board for Scotland, Part III., p. 313 (1897). 
+ Report on the Copepoda collected by H.M.S. ‘‘ Challenger,” p. 75. 
