478 THE ANNELIDA POLYCHAETA. 



the special form in its two diverging types. The types of the several genera 

 and subgenera with the better known species belonging to each are indicated 

 below. Because of the incompleteness of description many species cannot be 

 with certainty placed at present. 



Spirorbis Daudin (1800) : S. spirorbis Linn6 (S. borealis), type; also in sub- 

 gen. Spirorbis sens, str., S. beneti Marion, S. cornu-arietis Philippi, S. variabilis 

 Bush, S. mediterraneus CauUery and Mesnil, etc. In the subgenus Pileolaria, 

 Claparede (1870) are, e. g., S. militaris Claparede, type, and S. quadrangularis 

 Stimpson, S. morchi Levinsen, S. langerhansi CauUery and Mesnil, S. bernardi 

 CauUery, and Mesml, S. A-'oe/iferi CauUery and Mesnil, and (S. smiKs Bush. 



Protolaeospira Pixell (1912): P. ambilateralis Pixell, type. 



Paralaeospira CauUery and Mesnil (1897) : P. aggregata CauUery and Mesnil, 

 type; also P. racemosa Pixell, P. rnalardi CauUery and Mesnil, P. patagonica 

 CauUery and Mesnil, P. claparedi CauUery and Mesnil, P. lebruni CauUery and 

 Mesnil, and P. levinseni CauUery and Mesnil. 



Spirorbides, gen. nov.: S. cancellatus (Fabricius) type; also including S. 

 vitreus Fabricius. 



Spu'orbella, gen. nov.: S. inarioni (CauUery and Mesnil), type; also S. 

 semidentata (Bush) . 



Sinistrella, gen. nov.: S. verruca (Fabricius), type; also S. media (Pixell). 



Janua St. Joseph (1894): J. pagenstecheri (Quatrefages), type; also J. 

 pusilla St. Joseph (type of Mera St. Joseph). 



Leodora St. Joseph (1894): L. laevis (Quatrefages), type; also in Leodora 

 sens. str. are L. valida (Verrill), and L. argutus (Bush). In the subgenus Roman- 

 chella CauUery and Mesnil (1897) are L. perrieri (CauUery and Mesnil), type 

 and L. asperata (Bush). 



Circeis St. Joseph (1894) : C. spirillum (Linne) ( = C. armoricana St. Joseph), 

 type. 



Dexiospira CauUery and Mesnil (1897) : D. pseudocorrugatus (Bush' {D. 

 corrugata CauUery and Mesnil, which was first described but is preoccupied in 

 Spirorbis) type; also D. rugatus (Bush), and D. comphis (Bush). In Dexiorbis, 

 subgen. nov., are D.foraminosus Bush, type, D. bellulus (Bush), and D.Jormosus 

 (Bush). 



Paradexiospira CauUery and Mesnil (1897): P. violaceus (Levinsen), type. 



The name Laeospira CauUery and Mesnil is suppressed, as its species fall 

 either into Spirorbis or Pileolaria. We may regard it as proposed for the group 

 for which Spirorbis should have been retained in the restricted sense. 



