Some Littoral Mites of Millport. 129 
XVII.—Notes on the Habits and Characteristics of Some Littoral 
Mites of Millport. By L. A. L. King, M.A., St Mungo’s College, 
Royal Technical College, etc., Glasgow.! 
(Read 24th November 1913. MS. received 22nd December 1913.) 
GamastipA—Gamasus (Hugamasus) immanis, Berl. 
Gamasus (Halolelaps) glabriusculus, Berl. et Tronegsart. 
BpELLIDA— Molqus littoralis (Linn.). 
Bdella longicornis (Linn., 1758), Sig Thor, 1902. 
THE mites to which the following notes refer were taken, by the writer, on 
the shore in the immediate neighbourhood of the Marine Biological Station, 
Millport, Firth of Clyde. 
The observations recorded were made partly upon the shore, partly in the 
station. In the case of Hugamasus immanis, a number of individuals were 
kept under observation from 23rd August to 26th September 1911, during 
the last fortnight of which period the writer was in Derbyshire, and received 
supplies of littoral Oligochete worms from Millport as food for the mites. 
For examination of the living mites the writer uses a Ross-Stephenson 
binocular microscope with a one-inch objective. For examination of 
structural detail, and for identification, he kills them with hot 70 per cent. 
alcohol, subsequently transferring them to 90 per cent. alcohol, and clearing 
with beech-wood creosote. From this, after examination, they can be 
mounted direct in Canada balsam dissolved in xylol, or they can be soaked 
in acid 70 per cent. alcohol to remove the oil, and subsequently preserved 
in 90 per cent. alcohol. 
The coition of Hugamasus immanis was observed in a flat-bottomed 
watch-glass closed by a glass cover, a strip of paper being placed between the 
glasses at one point to admit air. 
Famity GAMASIDA. 
Gamasus (Hugamasus) immanis, Berl. 
Gamasus (EHugamasus) immanis, Berl., was recorded for Millport in the 
“Annual Report of the Marine Biological Association of the West of 
Scotland,” 1911, p. 69.2 On page 33 of the same publication a preliminary 
1 Figs, 1-4, 6, 7 and 9 from camera lucida drawings ; Figs. 5 and 8 from sketches. 
2 Mr Wm. Evans, F.R.S.E., tells me that he found this species on the shore of Loch 
Long, near Coalport, on 27th June 1910, and that he has taken it in the Forth 
Area since 1905, 
VOL. XIX. I 
