32 
Proceedings of the Royal Society of Edinburgh. [Sess. 
Bothrioplana Bohemica. 
This was first described by Braun in 1881, and it has usually been 
recognised that it occupies a more or less intermediate position between the 
Rhabdocoels and Triclads. Yedjovsky has also given a very full description 
of the anatomy of this form in the same paper. 
Late in August 1906 I found a small pool near the hotel at Tarbet, 
Loch Lomond. This pool is of some interest, as it appears only to exist in 
very wet weather, and after a fortnight’s fine weather at the beginning of 
September it was so dry that it was impossible to get any more material. 
The pool was about twenty yards long, with an average depth of about a foot, 
but the two ends of the pool were almost separated by a shallow. At one 
end of the pool large numbers of Vortex truncatus were found. At the 
other end large numbers of Prorhyncus curvi-stylis (Braun), Opistoma 
ScJmlzeanum, and Bothrioplana Bohemica (Vejdovsky) were found. 
Opistoma Schulzeanum is one of the more rare Rhabdocoels, but its 
anatomy has recently been thoroughly described by Vejdovsky. 
It may be interesting to note that, whilst Vejdovsky concluded from his 
observation that Opistoma did not live through the summer months, becom- 
ing sexually mature in the spring, sexual forms were abundant in Loch 
Lomond in August. 
Prorhyncus curvi-stylis. 
This animal was first found by M. Braun in a small ditch near Dorpat, 
and he has given a very careful description of its anatomy in the Turbellaria 
Livlands. It is readily distinguished from Prorhyncus stagnalis by the 
hooked copulatory organ and its size. The form found near Loch 
Lomond appeared to agree in all essentials with the form described by 
Braun, except for the absence of eyes in the Scotch form. 
Automolos Morgiensis. 
Automolos Morgiensis is one of the most common Turbellaria in the 
deeper waters of all the Scottish lochs that I have examined. Its cocoon, 
which I figure, is also fairly common (PI. IV., 5). It occurs more rarely in 
shallow waters, but only in those places where the bottom is composed of a 
soft mud, e.g. twice in four feet of water, August 1907, in the estuary of a 
small stream, Tarbet, Loch Lomond. It was first discovered by G. du Plessis 
in the deep water of Lake Geneva, and for a long time doubt existed as to 
its true position. 
Its discoverer placed it amongst the Alloiocoels, under the name of 
