NO. 3 HARTMAN : ORBINIIDAE, APISTOBRANCHIDAE, PARAONIDAE 327 



Aricidea (Aedicira) belgicae (Fauvel) 1936 



Paraonis belgicae Fauvel, 1936b, pp. 29-31, fig. 3. 



Aricidea belgicae Monro, 1939b, p. 127, fig. 16 a-b; Hartman, 1953, 

 p. 39. 



Length to 15 mm; width 1 mm or less; segments number 50-75 or 

 more. Branchiae are present from the fourth setigerous segment and 

 number 9 to 21 pairs; they are broad and end in an abruptly slender, 

 cirriform tip. In branchial segments the notopodial postsetal lobe is long 

 and filiform; the corresponding neuropodial lobe is short and broad. 

 The prostomial antenna is as long as the prostomium or surpasses it. 



Distribution. — Aricidea {Aedicira) belgicae comes from Antarctic 

 regions in 20 to 310 meters and off Uruguay in 80 meters (Hartman, 

 1953). 



Aricidea ? (Aedicira) ramosa Annenkova, 1934 



Aricidea ramosa Annenkova, 1934, pp. 657-658, fig. 3A; Annenkova, 

 1937, p. 172. 



Collections. — 2 1 72-52 ( fragment ) . 



The body is long and slender and consists of 40 to 60 segments. The 

 branchial region is broadly depressed and the posterior or abdominal 

 region is slender and cylindrical. The prostomium is broadly conical, 

 has a sensory palpode at its frontal margin and is without eyes. The 

 nuchal organs near the posterior lateral margins are darkly pigmented. 

 The prostomial antenna is palmately divided and has 4 to 6 distal lobes 

 of about equal size. 



Branchiae are first present from the fourth segment and number 16 

 pairs; each is flattened and ends in a slender tip. Notopodial postsetal 

 lobes in anterior segments are short; in abdominal segments they are 

 longer. Neuropodia have no postsetal lobes. In the prebranchial region 

 the setae of both rami are similar in form and length, each being some- 

 what sigmoid and limbate. From the fourth or fifth segment the noto- 

 podial setae are longer, slenderer and not limbate ; the neuropodial setae 

 remain unchanged. There are no known modified hooks ; the species is 

 thus referred to subgenus Aedicira but with a doubt, since posteriormost 

 segments are unknown. 



An individual from station 2172-52 measures 2.34 mm long for 

 25 segments (the posterior end is missing). The prostomial antenna is 

 palmately lobed with 4 terminal, similar lobes. Branchiae number only 

 18 pairs. This individual is questionably referred to Aricidea ramosa 

 because of the resemblance in other respects. The character of posterior 

 parapodia and setae is unknown. 



