TYPES OF POLYCHAETE WORMS HARTMAN 109 



L. caelorus and L. minutus are seemingly reversed, but the degree of 

 variation in this respect has ah-eady been commented upon (Moore, 

 1908, p. 331) and is observable in numerous collections examined. 



Lepidonotus castriensis Ssidler, from northeastern Asia, is close 

 to, if not identical with, L. caelor-us Moore. The descriptions agree 

 reasonably well. Seidler describes the elytra as beset with large 

 "Schuppen . . . die jede in der Mitte einen Hocker zeigt." The so- 

 called "Hocker" are presumably the spines, shown by Moore (1905, 

 fig. 36, a^c) . Seidler has not described or illustrated the shape of a 

 typical parapodium, but the setal structures, prostomial proportions, 

 and elytra are similar. 



LEPIDONOTUS HELOTYPUS (Grube) 



Polynoe (Lepidonotus) helotypus Grube, 1877, p. 49 (China). 

 Lepidonotus robustus Moore, 1905, p. 544 (U.S.N.M. no. 5523; Alaska). 

 (See Seidler, 1924, p. 56, for more complete synonymy.) 



Grube's type from China measures 56 mm long ; Moore's type from 

 Shelikof Strait, Alaska, measures 45 mm. long. Seidler (1924, p. 56) 

 indicated the possible identity of Moore's type with L. helotypus but 

 gave no explanation. It seems that this synonymy may be verified 

 in view of the similarity of the type of L. rohustus with the descrip- 

 tion of L. helotypus given by Seidler, who examined Grube's type. 



Genus HALOSYDNA Kinberg, char, emend. 



Body moderately short, depressed; number of setigerous segments 

 about 36; number of eltytra 18 (rarely 19), distributed on segments 

 2, 4, 5, 7, 9 . . . 27, 28, 30, 31, 33 (or rarely also on 34). Otherwise 

 as defined by Kinberg. 



Type of genus: Halosydna patagonica Kinberg, from southern 

 Chile. 



The genus Halosydna, as restricted above, includes the following 

 species which I believe to be valid : 



brevisetosa Kinberg (California). 

 latior Chamberlin (California). 

 nebulosa Grube (China). 

 pissisi (Quatrefages) (Brazil). 

 fuscomarmorata (Grube) (Peru). 

 elegans Kinberg (Galapagos Islands). 

 johnsoni (Darboux) (California). 

 miilleri (Grube) (Chile). 



parva Kinberg (Chile). 

 patiujonica Kinberg (Straits of Magel- 

 lan). 

 leucohyba (Schmarda) (Jamaica). 

 virgini Kinberg (Hawaiian Islands). 

 marginata (Grube) (Peru). 

 samoensis Grube (Samoa). 

 tubercuUfer Chamberlin (California). 



The following names, described in the genus Halosydna, all based 

 on specimens from California, seem to be synonyms or species in other 

 genera : 



