ADDITIONAL L.M.B.C. TURBELLARIA. 147 



Two examples, among seaweeds collected at low tide 

 near Port Erin Breakwater. 



Three specimens of an acoelous type, probably an 

 Aphanostoma, in which no trace of gonads or genitalia 

 was visible were taken by tow-netting in Port Erin Bay. 



Convoluta paradoxa, Oersted. 



One example only was found, in some seaweeds gathered 

 at low-water opposite the Biological Station. This indi- 

 vidual measured 2 mm. in length, and presented no trace 

 of the transverse bars which sometimes occur. 



B. Khabdocoela. 



Family Mesostomid^e. 



Promesostoma marmoratum (Schultze). 



Two specimens taken in tidal pools near the biological 

 station had the usual dark reticular pigment between the 

 eyes. Five others found among seaweeds between tide- 

 marks near the Breakwater were without reticular pigment, 

 but provided with copious yellowish-red colouring matter 

 in the epidermis, resembling the variety that v. Graff 

 records from Naples (Monographic, p. 270). 



Promesostoma solea (0. Schmidt). 



Although Gamble does not record this species in his 

 paper (4), he gives Port Erin as a locality in the list of 

 British species which he has appended to his article on 

 the Turbellaria in the Cambridge Natural History (vol. 

 ii., p. 49). I procured two specimens at low water, among 

 seaweeds, in front of the biological station. 



This species can at once be distinguished from P. ovoi- 

 deum (0. Schm.), by the presence of a curious process of 

 the pigment-cup, which extends outwards over the lens 

 of the eye. 



My two specimens differed considerably in the density 

 of their body pigment, in one it was as dense as in v. 



