178 MR JAMES MURRAY ON 
long foot has one segment more than is usual in the genus. The large figure (15a) on 
Plate IV. shows the foot partly retracted ; the smaller figure (15)) shows the true pro- 
portions. The corona is of the form usual in the genus. The discs bear each a central 
tuft of motile cilia, corresponding to the central setee of Philodina, etc. The collar is 
more worthy of the name than usual, consisting of a long pendant flap, very broad in 
the lateral part. Intestine pear-shaped. Reproduction viviparous. Loch Ness and 
the Caledonian Canal. 
ADINETAD A. 
A. tuberculosa, JANSON (24). (Plate IV. fig. 14.) 
This species has been found among hepatics at the margins of one or two lochs, and 
in other situations. The most distinctive character of the species is the series of coarse 
papillze which cover part of the body. 
All the Scottish examples differ from Janson’s description in one important 
particular. JANsoN says that the tubercles cover the whole body, with the exception of 
the last foot-segment. All the examples I have seen have no tubercles on the central 
seoments of the trunk. On the adjacent neck-segment and preanal the papille are 
largest, and diminish in size forwards and backwards from these segments, but remain 
large in several rows in the middle of the head. Their absence from the central 
segments is the more remarkable, as, in most species possessing a similar armature, this 
is confined to these very segments, or is strongest there and diminishes or disappears on 
the neck and foot. 
The spurs also differ from those figured by Janson, which are simply tapering, 
acuminate and acute. In our specimens they are enlarged from the base upwards for 
about two-thirds of their length, then shortly acuminate. 
Margins of Lochs Ness and Earn. 
NoroMMATAD&. 
Albertia intrusor, Gossk. (Plate V. figs. 24a to 24d.) 
In every example of Stylaria lacustris which | have examined under pressure, one 
or more parasites of the genus Albertia were invariably present. The species comes so 
near A. vitrusor, GOssE 
although Gossr’s figure gives no idea of the great posterior 
enlargement—that I identify my animal with that species. 
Ji, situ in the gut of the worm they were readily detected by their motions, alternately 
extending and contracting. When set free by the death of the host their behaviour 
was remarkable. They crept along in Bdelloid fashion, although no hold appeared to be 
taken by the toes. The head-grip was loosened, the posterior part of the body apparently 
