150 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



1"7 mm. and Gamble 1 — 1*3 mm. as usual size. The 

 number of turns in the spiral on the chitinous penis 

 varied between six and seventeen. The spiral was right- 

 handed in all the examples that I examined. The bursa, 

 which has a delicate chitinous lining, was very obvious 

 in some of the specimens I examined ; it has been accur- 

 ately figured by Jensen (7, Tab. iv., fig. 12). 



When disturbed this worm retreats rapidly backwards 

 in a very characteristic manner, attaching itself by its 

 adhesive tail and drawing the body up, the movement 

 being repeated in a leech-like manner. 



Acrorhynchus caledonicus (Claparede). 



Port Erin Breakwater, two specimens ; Port St. Mary, 

 between tide-marks, three specimens. 



Macrorhynchus nagelii (Kolliker). 



Among seaweeds at low-w T ater opposite the biological 

 station, six examples. 



Macrorhynchus croceus (Fabricius). 



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



This species was the commonest Turbellarian during 

 my stay at Port Erin ; numerous specimens, from fully 

 grown individuals with a ripe egg capsule in uterus, to 

 young ones in which the gonads were only appearing, 

 being found in every piece of seaweed examined, both 

 from Port Erin and from Port St. Mary. I have been 

 unable, although I had exceptional opportunities, to make 

 out from pressure preparations the relations of the female 

 gonads to the atrium, but I hope to be able to throw 

 some light upon this question by the examination of 

 sections of some specimens which I preserved for this 

 purpose. 



Macrorhynchus hcligolandicus, Metschnikoff. 



Occurred at Port St. Mary and at Port Erin among 

 seaweeds, and in tide-pools. 



