122 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 25 



Setae of the first 3 segments are long, pointed and form a cephalic 

 cage (PL 26, fig. 7). Seen individually, these setae are cross-barred 

 with individual bars longer than wide. Simple yellow falcigerous hooks 

 (PL 26, figs. 3, 4) are present from the fourth neuropodium ; they num- 

 ber about 4 in a neuropodium, and those in the superior part of the 

 fascicle are the largest ; they decrease in size farther down. Posterior 

 neuropodia may have only 2 hooks in a fascicle. The relations of the 

 hooks in a single fascicle are shown in PL 25, fig. 2. 



Pherusa neopapillata is related to P. papillata from which it differs 

 in having its surface epithelium more densely papillated ; the cross 

 striations of cephalic setae are wider apart, and the overall size is 

 usually less. It has been found most abundantly represented in southern 

 California, in shelf depths, in sediments of silt and mixed debris. 



Genus Piromis Kinberg, 1867 

 Type P. arenosus Kinberg, 1867 



Species of this genus grossly resemble those of Pherusa (see above). 

 The eversible oral process consists of a median, tongue-like membrane 

 on which the oral tentacles are inserted. This may be a modification 

 resulting from a forward prolongment of the tentacular basement mem- 

 brane. In the type species the oral tentacles (sometimes called branchiae) 

 are numerous; this may be a character of generic significance. Setae of 

 the first several segments are longer than others and directed forward to 

 form a cephalic cage. Notopodial setae are entire, slender and trans- 

 versely barred. Neuropodial setae are simple, distally bifid (PL 27, 

 figs, a-c) or falcigerous and entire. 



Semiodera Chamberlin, 1919, with type S. cariboo. (Grube) (see 

 Hartman, 1959b, p. 419) is believed congeneric. The incompletely 

 known Zorus Webster and Benedict, 1887, with type Z. sarsi Webster 

 and Benedict, may also belong to Piromis because it was described as 

 having tentacles arising from a protrusible cylindrical stalk and setae 

 were named as only capillary (Webster and Benedict, 1887, p. 730). 



As here understood, Piromis Kinberg includes at least the following 

 species : 



P. arenosus Kinberg, 1867, from South Africa. 1 See PL 27, figs. a-c. 

 P. congoensis (Grube) 1878, from Congo, West Africa. 

 P. americana (Monro) 1928, new comb., from Taboga, Panama. See 

 below. 



'I am indebted to Professor J. H. Day of the University of South Africa for the 

 specimen from which the plate was prepared. 



