NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 89 



The first parapodium (second segment) is enlarged, modified, pro- 

 vided with a digitate notoacicular lobe and numerous slender, capillary 

 notopodial setae, and a broad collar-like neuropodium (pi. 26, fig. 314) 

 with a large fascicle of setae. The ventral cirrus is long, stout, taper- 

 ing. The second parapodium is smaller and resembles those more pos- 

 teriorly. It has a slender, dorsal digitate notoacicular lobe and a deep 

 neuropodium broadest distally (pi. 26, fig. 315). Its setae resemble 

 those in more posterior parapodia. 



A typical parapodium contains slender, capillary notopodial setae, 

 and neuropodial setae as follows : ( 1 ) superior penicillate setae in which 

 the tip is drawn out in a point (pi. 26, fig. 317), (2) stout, median 

 aristate setae with an appendage (pi. 26, fig. 318), and (3) inferior, 

 sickle-shaped, serrulate setae (pi. 26, fig. 316). The ventral cirrus is 

 stout, tapering, and does not extend distally so far as the neuropodial 

 setae. 



No branchiae have been observed. 



P. marginata resembles Polyodontes gracilis Pflugfelder (1932, p. 

 288) from Sumatra (see also page 87) in its penicillate setae and in 

 having brown elytra. P. gracilis, however, was said to have parapodia 

 like those of Eupolyodontes sumatranus Pflugfelder, presumably there- 

 fore with digitate branchiae. The single incomplete fragment available 

 for study does not permit a complete description. 



Holotype.— AHF no. 19. 



Distribution. — Off San Jose Light, Guatemala. In 7 to 11 fms. 



Family Pisionidae Levinsen, revised 



Elongate, subcylindrical, consisting of numerous similar segments. 

 The proboscis cylindrical, protrusile, provided distally with terminal 

 papillae and with 4 chitinous jaw pieces. Prostomium more or less re- 

 duced, depressed, produced dorsally between the first few segments; 

 without attached antennae, or with a median cirriform one at its an- 

 terior margin. Eye spots 1 or 2 pairs, those of a side sometimes more 

 or less coalesced. First segment (buccal) greatly elongated and modi- 

 fied so as to project forward at sides and in front of the prostomium, 

 provided with 3 pairs of appendages (cirri), with or without acicula. 



Parapodia subbiramous, the notopodium represented only by an 

 aciculum, the neuropodium with an elongated ramus with simple, 

 acicular setae and composite falcigerous hooks. 



