182 ANNELIDA POLYCHAETA. 



patch of three paragnathi ; among them JS r . Anderssoni 

 belongs, found in the same locality as our specimens (Rio 

 de Janeiro). That species seems to be distinguished from 

 N. minor , by having in group I. of the proboscis not 2 , 

 but 4 paragnathi , however because the number of para- 

 gnathi in group I. is liable to some variation in the same 

 species, perhaps both species may prove to be identical. 

 In the following table I have tried to enumerate all the 

 known species of Nereis , which belong to the Perinereis- 

 group ; the literature on Annelida being however so exten- 

 sive and dispersed in so many periodicals, which are often 

 very difficult to be get, one or another species may have 

 been overlooked. Nevertheless I hope, that my colleagues, 

 dealing with this matter, will not find it quite useless. 



Perinereis. 



A. Transverse and conical paragnathi in group VI. 

 Marionii Aud. et Edw. Annales des Sciences naturelles, 



T. XXIX, 1833, p. 207, pi. XIII, fig. 1—6; Grube, 

 Anneliden des Pariser Museums , Archiv für Naturge- 



schichte, Jahrg. XXXVI, Bd. 2, p. 304 



[Coast of French (St. Malo , Vendee). 



mictodonta Marenzeller 2 ), Siidjapanische Anneliden, Denk- 



schriften der Math.-Naturw. Classe der Kaiserl. Akade- 



mie, Bd. XLI, p. 10, T. II, fig. 2. . . . Japan. 



B. Two transverse paragnathi in group VI. 



a. A triangular patch of 3 paragnathi in group V. 



vancaurica Ehl. (languida Gr.) Grube , Annulata Seni- 



periana, Mémoires de l'Acad. Imp. des Sciences de 



St. Pétersbourg , Vile Sér. T. XXV, p. 83; Ehlers, 



die Borstenwürmer, p. XX. . Nancauri (Nicobar I.). 



1) I do not understand Marenzeller's assertion, that this species could not 

 be ranged in Kinberg's family of the Aretidea; N. mictodonta appears to me 

 to belong to this family as well as N. Marionii , which both correspond with 

 each other in having a series of paragnathi in group VI, partially consisting 

 of transverse ridges. 



Notes from the Leyden Museum, "Vol- XI. 



