388 
PACIFIC SCIENCE, VoL V, October, 1951 
the neurosetae are long-handled uncini. Ab- 
dominal unicini are handled, with teeth in a 
pectinate row. 
2. F. atlantica (Treadwell), new combina- 
tion, was originally described as Haplohranchus 
atlanticusFtQdi6.wQ\\ (1932: 279-280, figs. 1-8) 
from St. Andrews, New Brunswick, in inter- 
tidal mud tubes. There are eight thoracic and 
three abdominal setigerous segments. The 
body measures about 4 mm. long. The 
thoracic collar is prominent on the ventral 
side and oblique at the sides; the dorsal end 
is short. The tentacular crown is incompletely 
known, except that it has pinnately divided 
radioles, each with a double row of seven or 
eight filaments. There are paired eyes in the 
peristomium and in the pygidium. Thoracic 
uncini are long handled; abdominal uncini 
are moderately long handled and have teeth 
in pectinate series. The second to eighth seg- 
ments have slender and subspatulate setae in 
notopodia. 
3. F. leidyi Verrill (1873:619), from New 
England, was not described until later by 
Leidy (1883: 210-211, figs. 14-20), based on 
specimens from Massachusetts and Rhode 
Island, found on rocks between tide marks 
and under patches of Fucus. The tubes project 
from the sand and mud and are firmly fixed 
together. Individual specimens measure 3 to 
4 mm. long; color in life is yellowish brown. 
The thorax consists of eight and the abdomen 
of three setigerous segments. There are paired 
eyespots in the thorax and in the pygidium. 
The tentacular crown consists of three pairs 
of pinnately branched radioles with the fila- 
ments in a double row. The thorax has slender 
and spatulate notosetae and long-handled 
uncini. The abdomen has long-handled un- 
cini above and slender setae below. A collar 
is not known to be present. In this respect, 
the species compares with the genotype, F. 
sabella (Ehrenberg). Except for the presence 
of spatulate thoracic setae, reportedly absent 
in F. sabella, the two are not clearly separable. 
Wesenberg-Lund (1941: 36) suspects the 
presence of spatulate setae even in the geno- 
type and thinks they may have been over- 
looked. 
4. .^F. alata Ehlers (1897:135-137, figs. 
206-210), from Patagonia and South Georgia 
in littoral zones, is questionably a species in 
this genus. An emended account, based on 
Antarctic collections, is in preparation. 
Genus Manayunkia Leidy, 1858 
Leidy (1883: 204-211, pi. 9, figs. 1-24) 
gives an emended account. 
The type species is M. spedosa Leidy, 1858. 
Manayunkia includes Haplobranchus’Bou.mQ, 
1883, Dybowscella Nusbaum, 1901, Garjaie- 
wella Dybowski, 1929, Fabrkiella Zenke- 
witsch, 1935, and Fabridola Friedrich, 1940. 
The tentacular crown has bases that are | 
semicircular; radioles are simple, unbranched ! 
filaments that range in number from 16 to 36 | 
down to only 4 pairs; they rise from a com- | 
mon base and are not pinnatedly arranged, | 
thus differing sharply from Fabrkia (above). ! 
There is no weblike or palmate membrane at I 
the base of the crown. The peristomium lacks 
or has a collar that is entire or has a dorsal 
notch. Eyes are absent, or present as a pair in j 
the peristomium or also pygidium. The body 
includes eight thoracic and three abdominal | 
setigerous segments. The peristomium lacks j| 
setae. The setal formula agrees with that of ! 
Fabrkia (see above). : 
Fabrkiella Zenkewitsch (1935: 199) was j 
proposed to include two species, Manayunkia !| 
padfiea Annenkova and Fabrkia {Manayunkia) 1* 
spongicola Southern, both of which are here | 
retained in Manayunkia Leidy. Fabrkiella was 
distinguished from Manayunkia Leidy mainly j 
for having pygidial eyespots and for specific || 
differences in the tentacular crown, both of jl 
^ j 
which characteristics are given only specific , 
distinction in the present account. For the ! 
same reason, Fabridola Friedrich (1940: 362) i 
is here regarded congeneric. 
Only one species is known from the Pacific. | 
1. Manayunkia pacifica Annenkova j 
(1934: 329-330, fig. 10) comes from the 
