268 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 15 



Phylo nudus (Moore) 1911 



Aricia nuda Moore, 1911, pp. 311-315, pi. 21, figs. 172-176; Fauvel, 

 1932a, pp. 162-163, fig. 25a-d. 



This species is here referred to Phylo Kinberg because posterior thor- 

 acic segments have modified glandular organs and spines (Moore, 1911, 

 fig. 174). It differs from typical species of the genus in having no ventral 

 fringe. The anterior thoracic region consists of 1 1 segments in which 

 only pointed setae are present. The posterior thoracic region comprises 

 segments 12 to 15; they have modified dark brown spines in anterior 

 vertical series numbering 5 to 7 in a row ; each spine is narrowly lanceo- 

 late or acicular; more posterior rows of setae are all pointed. 



Thoracic neuropodia have fringed postsetal lobes present between 

 segments 9 and 13; the fringes consist of 12 to 15 lobes in a row. 

 Branchiae are first present from the fifth setigerous segment and con- 

 tinue back to the end of the body ; they are simple and lingulate through- 

 out. Interramal cirri are absent; furcate setae have not been identified. 



Distribution. — Phylo nudus comes originally from southern Cali- 

 fornia in 207 to 497 fathoms from a mixed muddy bottom (Moore, 

 1911) ; it is further recorded from off Akyab, Burma, in 34 fathoms 

 (Fauvel, 1932a). 



Genus Haploscoloplos Monro, 1933 

 Type H. cylindrifer (Ehlers) 1905 



The prostomium is conical, varying from long and acutely pointed 

 to bluntly equitriangular. Eyes are present, especially in juvenile stages, 

 or absent. The thorax consists of 14 to 20 or more segments. The first 

 segment is a smooth apodous ring. Branchiae are first present from seg- 

 ment 10 (rarely before) to 25 and continued back on all or most seg- 

 ments; they are simple and branched (in the type of the genus) or 

 entirely simple. Thoracic neuropodia have setae that are all long and 

 distally pointed ; they are more or less spinous or serrated along their 

 free ends. Furcate setae are present in abdominal notopodia or absent. 

 Embedded acicula are present in all notopodia and abdominal neuro- 

 podia. Interramal cirri are present on few to many segments or absent. 

 Subpodial lobes (sometimes also ventral cirri) are present on few to 

 many segments or absent. Ventral fringe and parapodial fringe are 

 absent. 



