REVISION OF PILARGIDAE — PETTIBONE 199 



tips, with numerous transverse spinous rows. Pygidium a rounded 

 anal plate, concave ventrally, with pair of lateral cirri and midventral 

 one. Proboscis long, subcylindrical, clavate, with circlet of 8 large 

 papillae. Without intestinal caeca. 



Distribution : Southern California, Central America, Gulf of Mexico 

 (Florida, Mississippi, Louisiana). In low water to 625 fms. 



Family Polynoidae 



The pelagic polynoid upon which this part of the study was based 

 is the holotype of Ancistrosyllis longicirrata, taken from the plankton 

 off Peru and reported by Berkeley and Berkeley in 1961, with the 

 suggestion that it might be a juvenile of a bottom-living form. They 

 erroneously put it with the pilargids rather than with the polynoids. 

 Mr. Cyril Berkeley very kindly sent me the holotype and has allowed 

 me to study it and make additions and corrections to the original 

 description. It can be referred to Podarmus ploa Chamberlin, a 

 pelagic form described from off Easter Island in the South Pacific. 

 The holotype of the latter species is in the U.S. National Museum but 

 it is in very poor condition, being dark, brittle, and covered with 

 crystals, making it difficult to study many of the structures; according 

 to the original description by Chamberlin, it had been fixed in 

 Fleming's fluid, causing a blackening of the tissues. Coloration and 

 the poor condition of the specimen could account for Chamberlin's 

 failure to mention some features. The elytra are missing on the 

 specimens from both collections. Both are probably juveniles and 

 not fully developed (30 segments, 14 pairs elytrophores for P. ploa; 

 35 segments, 16 pairs elytrophores for A longicirrata). Podarmus 

 atlanticus Monro is herein referred to P. ploa since the setal differences 

 indicated by Monro appear to be within the range of variation for the 

 species; the specimen was perhaps fully developed (45 segments, 18 

 pairs elytrophores). 



Genus Podarmus Chamberlin, 1919, emended 



Podarmvs Chamberlin, 1919. [Type-species: P. ploa Chamberlin, 1919, by 

 original designation and monotypy. Gender: masculine.] 



Diagnosis: Colorless and transparent, pelagic. Body short, taper- 

 ing posteriorly, composed of relatively few segments (30-45). Pro- 

 stomium bilobed, rounded, without cephalic peaks; 3 long antennae 

 with ceratophores distinct, median antenna inserted in anterior notch, 

 lateral antennae inserted slightly ventrally (subterminally, not 

 lepidonotoid or halosydnoid), with paired palps. Tentacular segment 

 achaetous, with 2 pairs of long tentacular cirri. With pair of long 

 ventral cirri or buccal cirri on segment 2 (first setigerous). Parapodia 



