NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 33 



Halosydna parva Kinberg 

 Plate 21, Figs. 265-267 



Halosydna parva Kinberg, 1855, p. 385; 1910, pp. 17-18, pi. 5, fig. 24; 



Seidler, 1924, p. 116. 

 Polynoe mitlleri Grube, 1856, p. 48; Augener, 1906, p. 119. 

 Polynoe clavata Grube, 1856, p. 47. 



Collections.— 22-Z3, 152-34, 374-35, 380-35, 610-37. 5 specimens. 



Some individuals have a rust colored dorsal pigmentation, others 

 sooty. The dorsum is marked M^ith segmental dark transverse stripes; 

 the prostomial antennae and palpi are dark. 



The prostomium, w^ithout the prostomial peaks, is 6-sided, and a 

 little wider than long. A shallow median sulcus extends throughout its 

 length. Eyes are subequal in size. The median ceratophore is inserted 

 broadly between the bases of the lateral ceratophores. The median style 

 is 4 or 5 times as long as its base. Palpi are smooth, extending distally 

 beyond the peristomial cirri. 



The neuropodial setae are pale amber, disposed 16 to 20 in a 

 fascicle, in 2 or 3 trim vertical rows. All are similar, subequal to one 

 another, and distally bifid (pi. 21, fig. 267). The notopodial setae are 

 much finer than the neuropodial setae, the dorsalmost shorter, blunter. 

 Elytra have lateral fringe on the exposed ectal margin (pi. 21, fig. 266), 

 and microtubercles over the surface (pi. 21, fig. 265), distributed most 

 abundantly on the exposed part of the surface. Most of the surface has 

 a finely reticulated pigmented pattern, least developed where the 

 tubercles are largest. 



Several individuals from Peru dilifer slightly in that the micro- 

 tubercles are proportionately larger. A specimen from Santa Rosalia 

 Bay, Lower California (610-37), has some of its neuropodial setae 

 entire distally. It is very dark (preserved) throughout. 



Augener (1906, p. 118) had occasion to reexamine the type of 

 Polynoe clavata Grube and concluded that it and H. miilleri Grube 

 were identical. An elytrum from the type of P. clavata (Augener, 1906, 

 pi. 3, fig. 45) closely resembles one from a specimen from Independencia 

 Bay, Peru (374-35). Grube gave "West Indies" as the type locality. 

 Augener, however, corrects "dass diese von Callao [Peru] an der 

 pacifisch-amerikanischen Kiiste stammt." The neuropodial setae are 

 clearly bifid (pi. 21, fig. 267), the serrated rows distinct. 



