IDENTITY OF SOME MARINE ANNELIDS—HARTMAN 125 
specimen; maxilla V has a single tooth (fig. 13 d). On the left 
side only two plates (IV and V) remain. The formula, insofar as 
can be determined, appears to be : Right side=8 (or 9) +16+?%+1; 
left side= ?+ ?+7+1. 
In posterior segments limbate setae are distally pointed, curved 
in the winged region; the superiormost and inferiormost are smooth, 
but three or four in the median part of the fascicle are denticulate, 
with several rows of spinelets in the thickest region. 
A. wridescens is characterized in having a depressed, triangular 
prostomium without eye spots; maxilla I has numerous teeth on the 
cutting edge. Its proboscideal armature resembles that of A. genicu- 
lata Claparéde (Fauvel, 1923, p. 439), but the latter has prostomial 
eyes. 
ARABELLA ZONATA (Moore) 
Notocirrus zonata Moors, 1908, p. 45 (U.S.N.M. No. 15736; off Honshu Island, 
Japan, in 34 fathoms). 
There is only a single incomplete fragment that was dried when 
received; it lacks head and anterior end, including proboscideal 
parts. Parapodia are provided with only simple, pointed, limbate 
setae, such as characterize Arabella, but lack heavy acicular setae 
such as are present in Drilonereis. (See below.) It is therefore 
referred to the former. 
Genus DRILONEREIS Claparéde 
DRILONEREIS ROBUSTA (Moore) 
Ficurke 11, e, d 
Laranda robusta Moore, 1903, p. 454 (U.S.N.M. No. 15818; off Japan, in 173- 
260 fathoms). 
This species belongs to a small group of lumbrinerids in which 
(1) parapodia are provided with only simple, pointed limbate setae 
accompanied by single, heavy, projecting, acicular setae, (2) the 
prostomium lacks eye spots but has a conspicuous median, longi- 
tudinal sulcus on its dorsal surface, (3) the maxillary carriers are 
long, paired, slender pieces accompanied by a shorter, flat, unpaired 
piece on its ventral side, (4) forceps are long, strongly falcate, with 
denticulations at the base, and (5) mandibles consist of a pair of 
short, flat pieces about twice as long as wide. These characters are 
intermediate between two genera—Avrabella Grube and Drilonereis 
Claparéde—and differ from the first in lacking eye spots and having 
heavy projecting acicular setae and from the second in having well- 
developed maxillary parts in which the forceps are strongly falcate, 
with basal teeth; the other paired pieces are also denticulate (fig. 
11,d). It agrees most nearly with Drilonereis. 
Heavy acicular spines are first seen to project from the antero- 
ventral part of the eighteenth setiger; they come to be heavier and 
