28 
Proceedings of the Royal Society of Edinburgh. [Sess. 
III. — Notes on some Turbellaria from Scottish Lochs. By 0. H. 
Martin, B.A. (Magdalen College, Oxford). Communicated by Sir 
John Murray, K.C.B. (With Plates III., IV.) 
(MS. received April 3, 1907. Read May 20, 1907.) 
In this paper I wish to refer to some of the more interesting Turbellaria 
found during the months of July, August, and September 1905 at 
Ardeonaig on Loch Tay, and during August and the early part of Septem- 
ber 1906 at Tarbet on Loch Lomond. 
I also wish to describe in more detail a newly discovered Kalyptorhynch, 
and to put forward some observations on the origin of the nematocysts in 
some Microstoma lineare. 
The opportunity of working on these forms occurred in connection with 
the work of the Scottish Lake Survey under Sir John Murray, to whom, 
for his unfailing kindness, I owe a very deep debt of gratitude. 
POLYCYSTIS GOETTEI. 
During the early summer of last year (1906) I found large numbers of 
small Proboscidea in a shallow pool on the Deri near Abergavenny, and 
later I found a few examples on the shores of Loch Lomond. 
I had already completed my drawings and descriptions of this form when 
I found a full account of the animal by E. Bresslau in the Zoologischer 
Anzeiger for July 1906. As, however, there is as yet no account of this 
animal in English, and as my account differs from his in some important 
points, particularly as regards the water- vascular system, I have decided to 
publish it. 
In those places in which it occurs, Polycystis Goettei is a very abundant 
form, swimming actively amongst water weeds, in association with 
Prorhyncus stagnalis, Vortex truncatus, and Gyrator notops. 
Its food appears to consist mainly of copepods. In general appearance 
it closely resembles a small Polycystis ncegelii : the body (PI. III. fig. 1) 
is about 2 mm. long and more or less cylindrical, though the shape under- 
goes great changes, depending upon the extent of muscular contraction. 
In extreme cases the whole anterior end of the body can be invaginated 
so that the eyes appear to be near the posterior end. 
At the anterior end there is a large protrusible proboscis with four long 
