SERPULIDAE. 475 



hh. Collar setae in part simple blades and in part with a shallow posterior notch. 



i. Tube sinistral SinistreUa, gen. nov. 



ii. Tube dextral Janua St. Joseph. 



qg. Collar setae all simple blades. 



h. Tube sinistral; three thoracic somites Leodora St. Joseph. 



I. Incubation in the operculum subgen. l,eodora sens. sir. 



ii. Incubation m the tube subgen. Romanchella Caullery and Mesnil. 



hh. Tube dextral. 



i. With three and a half thoracic somites. . . .Paradexiospira Caullery and Mesnil. 

 ii. With three thoracic somites. 



,/. Blades of collar setae geniculate; incubation in the tube. Circew St. Joseph. 

 jj. Collar setae not geniculate, evenly curving; incubation in the operculum. 



Dexiospira Caullery and Mesnil. 



k. Collar setae broadly rounded at base Dexiorhis, subgen. nov. 



kk. Collar setae with blade regularly tapered Dexiospira sens. .ilr. 



ff. Not with these characters, the tubes not in such spirals, though often sinuous and vari- 

 ously curved, and in some normally aggregated in polvpiform groups. 

 g. Setae of the first thoracic somite with a posterior notch and a crenulate wing. 



h. Falcate setae with blades not preceded by a limbus on one or more thoracic somites. 



i. No thoracic membrane Chitiimpoma Levinsen. 



ii. A thoracic membrane present. 



j. Tubes very fine, nearly always aggregated in poI>^>like groups. 



k. With a spoon-shaped operculmu placed obUquely at the end of a branchia. 



Filograna Oken. 



kk. With no operculum Salmaeina Claparede. 



ij. Tube ordinary. 



Operculum infundibuliform, resting on an ampulla, with the peduncle bearing 



barbules FUogranula Lang. 



hh. Other thoracic somites not with such falcate setae lacking laminae. 



i. These setae with limbus followed by a falciform tip on one or more somites. 

 Erect part of tube forming a right angle with fixed part; operculum ampuUi- 

 form, followed by a concave plate from which proceeds a small point. 



Omphalopoma Morch. 

 gg. Setae of first thoracic somite without posterior notch or crenulate wing. 

 h. Setae of first thoracic somite geniculate. 



Setae of other somites with blade followed by a falciform tip (Apomatus form); 

 branchiae rather numerous; tube ordinary; operculum a round ampulla with 



terminal concave plate Omphalopcnnopsis St. Joseph. 



hh. Setae of first thoracic somite acicular. 



Setae of other thoracic somites of Apomatus form; tube ordinary; operculum with 

 triangular ampulla surmounted by a piece in the form of an hour-glass. 



Janiia St. Joseph. 

 ee. Abdominal setae not geniculate, capillary on all somites. 



/. Setae of first thoracic somite with notch and crenulate wing; setae of other thoracic 

 somites laminate only ; oi)erculum membranous, vesicular. . H i/alopomatopsis St. Joseph. 

 dd. With no special setae on first somite or collar, or setae missing from this somite altogether. 



e. No setae on the first somite Rhodopsis Bush. 



ee. Collar setae present. 



/. Abdominal setae geniculate and dentulate. 

 g. Thoracic setae hmbate only. 



h. Operculum covered with pieces bearing a large number of spines. 



Galeolaria Lamarck. 

 hh. Operculum cylindrical, borne on an ampuUa, with one to several transverse furrows. 



Vermilia Lamarck. 

 gg. Thoracic setae of Apomatus as well as the limbate form. 



Operculum on an ampulla, with a horny cap wluch may be curved or somewhat 



spiral Vermiliopsis St. Joseph. 



//. Abdominal setae not geniculate; thoracic setae all limbate. 

 g. Abdominal setae capillary on all somites. 

 h. With a thoracic membrane. 



