NEW SPECIES OF POLYCHAETOUS ANNELIDS 



FROM SOUTHERN CALIFORNIA 



with a discussion on the host of one of them. 



(Plates 29, 30) 



By Olga Hartman 



Two new species, Hesionella mccullochae, new genus, new species, 

 and Poecilochaetus johnsoni, new species, are described. The first be- 

 longs to a family for which only a single species {Podarke pugettensis 

 Johnson) has heretofore been known from California; the second to a 

 small family (Disomidae), not previously reported from the Western 

 Hemisphere. The former is associated with a species of Lurnbrineris , the 

 status of whose specific name is in some confusion, and for which some 

 observations are made on the life history. 



Family Hesionidae 

 HESIONELLA, new genus 



Body elongate, depressed, consists of numerous segments. Prosto- 

 mium with a pair of frontal antennae inserted ventrally, a pair of re- 

 duced palpi on the ventral side, and no eyes. First 3 segments each with 

 a pair of long dorsal cirri and a pair of shorter ventral cirri. More pos- 

 terior segments subbiramous. The notopodium provided with a con- 

 spicuous flattened lobe, a small embedded aciculum, and terminating in 

 a simple dorsal cirrus. The neuropodium with a fascicle of composite 

 setae, a heavier aciculum, and cirriform ventral cirrus. 



Proventriculus apparently without teeth or chitinous structures; 

 extends posteriorly through about the seventh segment. Anal cirri 2, 

 depressed, distally truncate. 



Differs from other genera of HESIONIDAE which have 6 pairs 

 of tentacular cirri and 2 antennae in that the notopodia are provided 

 with flattened dorsal lobes that terminate in short dorsal cirri ; the pro- 

 stomium lacks eye spots, and the anal cirri are short, depressed. 



Hesionella mccullochae, new species 

 Plate 29, Figs. 1-4 



General form minute, greatly flattened, tapering slightly anteriorly 

 and posteriorly. Number of segments 37 to 45, the first 3 provided with 



[159] 



