AMPHINOMIDAE 



35 



The larger specimens measure about ii mm. by 8 mm. including the feet, and the 

 smaller about 5 mm. by 3 mm. The number of chaetigers is between 17 and 21. The 

 body is oval and rather squat, and the colour in spirit is a pale yellow with white bristles. 

 The median tentacle is short and thick. The posterior eyes are large and the anterior are 



T Imm 



-^0 



0-^ 



•5 mm 



^O 



Fig. 4. Euphrosyne arctia. 



a. Gill. b. "Ringent" bristle, c. " Ringent" bristle, d. Smooth dorsal bristle. 

 e. Intermediate dorsal bristle. 



partly hidden behind the front of the buccal folds : the mouth reaches to the anterior 

 border of the 5th chaetiger. The caruncle is high, and apparently composed of a single 

 lobe superficially divided by longitudinal grooves running along both sides ; it reaches 

 to the anterior border of the 6th chaetiger. 



The branchiae begin on the ist chaetiger and are arranged in transverse rows of 

 five trunks on either side. These trunks (Fig. 4, a) branch four times and end in curious 



