AMPHINOMIDAE 79 



— Prostomium conical. Anterior region abranchiate; posterior region with or without simple 

 branchiae; or the branchiae may be branched and retractile into lateral pouches. In the 

 abdominal region, dorsal and ventral tori with sigmoid hooks ... ... Capitellidae 



31. An operculum of an anterior row of large golden paleae. Caudal region very small and 

 foliaceous, with hooks at the base. Two pairs of anterior branchiae. Tube of sand, conical, 

 free Amphictenidae 



— Two large, opercular stalks bearing a crown of paleae. A narrow achaetous and abranchiate 

 caudal region. Branchiae dorsal and numerous. Fixed, sandy tubes, often in masses 



Sabellariidae 



32. Without operculum and without thoracic membrane. Tube membraneous or mucous 



Sabellidae 



— Usually with an operculum. Thoracic membrane present. Tube calcareous Serpulidae 



Family AMPHINOMIDAE 



Notopodial bristles in transverse rows across the back ... ... ... ... Euphrosyne 



Notopodial bristles lateral ... ... ... ... ... ... ... ... Chloeia 



Genus Euphrosyne, Savigny 



Body oval and segments few. The prostomium which bends over the front end of the 

 body is partly dorsal and partly ventral. Caruncle with three parallel longitudinal lobes. 

 An unpaired tentacle. Lateral tentacles on the ventral surface. Notopodial bristles in 

 transverse rows across the back. Branchiae ramified and similarly disposed in trans- 

 verse rows of trunks behind the dorsal bristles. Paired dorsal cirri on each side. 



Five pairs of branchial trunks per segment Euphrosyne arctia 



Six pairs of branchial trunks per segment Euphrosyne maorica 



Euphrosyne arctia, Johnson. 

 Monro, 1930, p. 34, fig. 4 a-e. 



Occurrence. St. WS 228 (9); WS 231 (2); WS 246 (4); WS 871 (3). 



Specific characters. Length about ii mm. Number of chaetigers between 17 and 

 21. Mouth reaches to anterior border of 5th chaetiger. Caruncle high and superficially 

 divided into three longitudinal lobes. It reaches back to the 6th chaetiger. Branchiae 

 begin on the ist chaetiger and are arranged in transverse rows of five trunks on each 

 side. These trunks usually have four branches and end in small pointed tips. The lower 

 of the two dorsal cirri lies between the 2nd and 3rd most dorsal branchial trunks. The 

 dorsal bristles consist of (i) smooth bifid bristles, (2) ringent bristles, (3) a few bristles 

 apparently intermediate between the " ringents " and the smooth " bifids ". The ventral 

 bristles are simple bifids of two sizes. 



Remarks. Neither in this nor in the earlier Discovery collections (Monro, 1930) was 

 an example of this species obtained above the loo-m. line. 



Euphrosyne maorica, Augener (Fig. i). 

 Augener, 1924, p. 259, fig. i a-d. 

 Occurrence. St. 935, New Zealand (i). 



