350 HELEN L. M. PIXELL ON 



The abdomen has only a very short asetigerous region, followed by 80 to 110 narrow 

 segments with sickle-shaped setfe (fig. 2, c). Many of these sickles have, however, 

 become much straightened, owing, no doubt, to their prolonged immersion in alcohol. 

 The posterior setae are very elongated. The dorsal gland, generally present in the 

 young, is very little developed, and in two specimens appears to be wanting. There 

 is a deep ventral fsecal groove which turns to the right on reaching the thorax. 



The uncini have only seven or eight sharp teeth (fig. 2, d and e) ; consequently, if 

 Saint- Joseph's classification (16, p. 263) according to the characteristics of the uncini 

 were rigorously adhered to, this species would have to be placed in a new genus in 

 Group I., with Serpula, etc., instead of in the genus Apomatus, which Saint- Joseph 

 includes in his Group V., which is made up of forms whose uncini have very numerous 

 and fine teeth. 



Genus Filograna Oken, 1815. 

 Generic characteristics : — 



1. Tube very slender, filiform, colonial. 



2. Branchiae eight. 



3. Thorax with seven to nine segments. 



4. Collar-setae with a large fin-like expansion at base of blade. 



5. Other thoracic setae sickle- shaped (setae of Salmacina), or ordinary bladed 



ones. 



6. Abdominal setae more or less geniculate and serrated. 



7. Hermaphrodite. 



Sub-genus Salmacina Claparede, 1870 (2, p. 176). 



1. No operculum. 



2. The ends of the branchiae may or may not have spathulate enlargements due 



to the presence of large granular cells. 



Salmacina dysteri (Huxley), 1855. 



Protula dysteri Huxley, 1855 (10, p. 113). 

 FiloporafiJograna Dalyell, 1853 (3, p. 250). 



Specific characteristics : — 



1. Branchiae with spathulate enlargements containing granular masses at their 



ends. Similar granules occur at the ends of the pinnae, and just in front 

 of their bases along the gill rachises. 



2. Spermatozoa developed in segments anterior to those producing ova. 

 Zocoi%.— Station 461, Gough Island, lat. 40° 20' S., long. 9° 56' 30" W., 



100 fathoms. Several fairly large masses brought up by the trawl with Serpula 

 vermicularis, coral, etc. No specimens in process of budding were observed. 



