TWO Nl'JW BRITISH NEMEUTEANS. 555 



Rest of 



LineicUe. 



Micrella. 



Eupoliidae. 



Hefceronernertini. 



Pi'otoneinertini. 



Fam. EupoLiiD.E. 



Oxypolia, iiov. gen. 



Short aiul stout in builil, and with pointed head. Proboscis 

 pore ventral. Circular ciliated groove round head just in front 

 of mouth. Rhynchocoeloni to end of body. Excretory system 

 witli many ducts. Cerobi'al organs sma,ll and not surrounded 

 by blood lacunte. Proboscis with tliree muscle layers^ but 

 without muscle crosses. 



Oxypolia beaumon tiana. 



The largest specimen of this worm, Avhich was sent me in the 

 living states from Plymouth, measured about 12 cm. in length 

 and about 5 mm. in breadth. When extended the whole 

 worm became greatly flattened. In contraction this was 

 much less noticeal)le, the anterior portion of the body 

 becoming quite cylindrical. The colour was pure white in the 

 anterior portion, whilst the intestinal region was of a pale 

 rose-colour. The following notes on the live animal were 

 made by Mr. Beaumont, who kindly gave them to me together 

 with the two specimens which he had piocured : — " Anterior 

 half milk-white (and this part is rounder in section than the 

 i*est), whilst the remaining portion has a brownish look 

 about it, and shows more opaque rings, not very regular, 



