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 Linne iS. borealis), type; also in sub- 

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

 Bush, S. mediterraneus Caullery 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 Caullery and Mesnil, S. bernardi 

 Cauller^', and Mesnil, aS. fcoeMen Caullery and Mesnil, and *S. similis Bush. 



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



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

 type; also P. racemosa Pixell, P. malardi Caullery and Mesnil, P. patagonica 

 Caullery and Mesnil, P. claparedi Caullery and Mesnil, P. lebruni Caullery and 

 Mesnil, and P. levinseni Caullery and Mesnil. 



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

 vitreus Fabricius. 



Spirorbella, gen. nov.: S. marioni (Caullery 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. sir. are L. valida ( Verrill) , and L. argutus (Bush). In the subgenus Roman- 

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

 and L. asperata (Bush). 



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

 type. 



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

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

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

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

 (Bush). 



Paradcxiospira Caullery and Mesnil (1897): P. violaceus (Levinsen), type. 



The name Lacospira Caullery 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 retaincul in the restricted sense. 



