SERPULIDAE. 475 



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



i. Tube sinistral Hinistrella, ^en. 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. Leodora sens. str. 



ii. Incubation in the tube subgen. RomanchcUa Caullery and Mesnil. 



hh. Tube dextral. 



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

 ii. With three thoracic somites. 



j. Blades of collar setae geniculate; incubation in the tube . Circeis St. Jo.scph. 

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



Dexiospira Caullery and Mesnil. 



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



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



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

 ously curved, and in some normally aggregated in polypiform 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 Chitinopoma Levinsen. 



ii. A thoracic membrane present. 



j. Tubes very fine, nearly always aggregated in poljrp-likc groups. 



k. With a spoon-shaped operculum placed obhquely at the end of a branchia. 



Filograna Oken. 



kk. With no operculum Salmadna Claparede. 



ij. Tube ordinary. 



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



barbules Filogranula Lang. 



hh. Other thoracic somites not with such falcate setae lacldng 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 ampulli- 

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



Omphalopoma M()rch. 

 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 Omphalopomopsis 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. 



Janita St. Joseph. 

 cc. 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; ojierculum membranous, vesicular . . Hi/alopoinalopsis 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 limbate only. 



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



Galeolaria Lamarck. 

 hh. Operculum cylindrical, borne on an ampulla, 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 which 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. 



