TYPES OF POLYCHAETE WORMS HARTMAN 111 



The following species belong to the genus HdlosydneUa: 



Halosydna australis Kinberg, from the La Plata River. 



Halosydna hrasiliensis Kinberg, from Brazil. 



Halosydna fusca Grube, from Brazil. 



Halosydna alleni Day, from False Bay, South Africa. 



Halosydna grisea Treadwell, from Argentina. 



Polynoe punctulaia Grube, from Brazil. 



Halosydna galapagensis Monro, from the Galapagos Islands. 



Halosydna oculata Treadwell, from Samoa. 



Halosydna fusca-maculata Treadwell, from the Barbados. 



A comparative study of the types of these species, especially those 

 from the eastern coast of South America, may reveal the identity of 

 some of them. 



HALOSYDNELLA GRISEA (Treadwell), new combination 



Figure 36, d, e 



Halosydna grisea Tkhadwell, 1929, p. 1 (U.S.N.M. no. 19279; Argentina). 

 ? Halosydna australis Kinberg, 1S55, p. 385 (La Plata River). 



In the type, the lateral margin of the scales of the posterior half of 

 the body is quite smooth, the margin of the anterior scales is succes- 

 sively more ciliate, the scales 2 to 8, at least, being ciliate along their 

 entire free lateral edges, where they do not overlap one another. 

 Neuropodia are distally truncate, extending laterally well beyond the 

 papillate notopodium (fig. 36, d). Neuropodial setae number 12 to 15 

 in a fascicle and are arranged in two more or less irregular vertical 

 ranks. The subterminal tooth is well outdistanced by the terminal 

 fang (fig. 36, e). There are 4 to 9 transverse rows of pectinae along 

 the thickened region. 



The identity of H. grisea and H. australis seems likely in view of the 

 similarities that are to be observed in comparing Kinberg's description 

 and figures with the type of H. grisea. Both are from Argentina. 



HALOSYDNELLA FUSCA-MACULATA (Treadwell), new combination 



Figure 86, /, g 



Halosydna fusca-maculata Treadwell, 1924, p. 5 (U.S.N.M. no. 20330; West 



Indies ) . 

 Halosydna fuscomarginata Tre.«iDWELL, 1924 (in explanation of figures). 



The type has 45 setigerous segments and 21 pairs of elytrophores. 

 Prostomium and elytra are as indicated by Treadwell. The scales, 

 posterior to the first pair, are tiny and leave the dorsum broadly ex- 

 posed; those on a side are widely separated from one another by 

 almost the length of a segment. I was unable to detect a subterminal 



