ADDITIONAL L.M.B.C. TURBELLARIA. 157 



had been out of the water for a couple of days before I 

 received them, I cannot say whether the host suffers 

 serious consequences from the attacks of the parasites ; 

 the kidney, in many cases, was distended, and contained 

 a large quantity of mucus, and its walls seemed to be 

 locally attenuated, being almost transparent in places. 

 Locality : — Port Erin, Isle of Man. 



C. Alloioccela. 



Family Plagiostomid^e. 



Plagiostoma Jcoreni, Jensen. 



New to L.M.B.C. District. 



Four specimens occurred among seaweeds collected in 

 tide-pools near the biological station. 



Body oval, pointed behind, rounded in front, broadest 

 about the middle. Colour, under a low power or pocket 

 lens, greyish white with a broad dark band across the 

 body about the middle. The colour is due to two kinds 

 of pigment, a dark brown reticular pigment in the paren- 

 chyma, which corresponds to the dark zone ; and a lighter 

 brown granular pigment in the epidermis, which, although 

 denser in the middle of the body, extends to the head and 

 tail as well. 



The eyes are very variable in form, carmine red, and 

 as far as I can make out have no lens. One of my 

 examples presented a particularly beautiful variation in 

 the form of the eyes. Here they were triangular, carmine 

 red, with a violet spot in the centre which sent processes 

 of the same colour to the three angles. I am inclined to 

 believe that in this species we have an eye of the Monotus 

 type, i.e., a simple mass of pigment without lens. 



Plagiostoma vittatum (Frey and Leuckart). 



One specimen in a pool near the biological station, 



