Fabricinae in the Pacific — Hartman 
389 
Bering Sea in littoral zones. The body is 
minute, only 1.5 to 3 mm. long, and is cylin- 
drical in shape. There are eight thoracic and 
three abdominal setigerous segments. The 
tentacular radioles number 15 to 18 on a side, 
are slender, unbranched, and arranged in a 
tuft. There is no palmate membrane, and all 
radioles are about equally long. The palpi 
are long. The thoracic collar is a simple un- 
divided flange incised only on the dorsal side. 
There are paired eyes in the peristomium and 
in the pygidium. The setae and uncini are 
those characteristic of the genus. The tube is 
of silt and fine sand. 
In addition, the following species appear 
to be congeneric: 
1. M. aestuarina (Bourne), 1893, from 
western Europe in fresh water. (See Fauvel 
1927: 326-327, fig. 113.) 
2. M. haicalensis (Nusbaum), 1901, from 
Lake Baikal, in fresh water. (See Zenkewitsch, 
1925: 34-35, figs. A to X.) 
3. Af. caspica Knn.QnkoY 2 i (1928: 19-20, pi. 
3, figs. 1-4), from the Caspian Sea in 44-64 
meters. 
4. AI. Zenkewitsch (1935: 195-203, 
figs. 1-6), from northwest Russia at midtide 
level. This appears to be near M. aestuarina 
(Bourne) . 
5. M. speciosa Leidy, 1858 (see Leidy, 1883: 
204-211, pi. 9, figs. 1-24), from northeast 
United States in fresh and brackish water, and 
recorded also from the western end of Lake 
Superior by Meehearn (1929: 479-480). M. 
eriensis Krecker (1939: 153) from Lake Erie, 
Ohio, in fresh water, may be the same. 
6. M. spongicola was originally named 
Fabricia {Manayunkia) spongicola Southern 
(1921: 653-655, pi. 31, fig. 29) from Lake 
Chilka, India, in fresh water. 
7. M. haltica (Friedrich) (1940: 363-364, 
figs. 1-2) from the Baltic Sea. 
8. M. bochmanni (Friedrich) (1940: 364- 
365, figs. 3-4) from the Baltic Sea. 
Other species that were originally de- 
scribed as Manayunkia, or under one of its 
synonyms, are the following: 
1. Haplobranchus balticus Karling (1933: 
242-245, figs, a-e), from the Baltic Sea, has 
unbranched radiolar filaments as in Manayun- 
kia Leidy. However, there are 11 thoracic and 
3 abdominal setigerous segments. The first 
segment has both setae and uncini. These 
characters do not agree with any named 
genus. 
2. Manayunkia africana Monro, 1939, is 
here referred to Monroika (see below). 
3. Manayunkia siaukhu Annenkova, 1938, 
is questionably referred to Fabricia (see 
above) . 
4. Haplobranchus atlanticusFsQ 2 i(FwQ[\, 1932, 
is referred to Fabricia (see above). 
Genus Monroika new name 
The small body, a few millimeters long, 
consists of a simple peristomium, eight 
thoracic and two abdominal setigerous seg- 
ments. The tentacular crown has simple, un- 
divided radioles in a tuft, as in Manayunkia, 
but there is a high weblike palmate membrane 
that unites the bases of the radioles. The 
thoracic collar is distinct and entire with a 
middorsal incision. Eyespots are lacking from 
the peristomium and pygidium. The first seg- 
ment lacks setae. The first setigerous segment 
has notosetae only. The second to fifth have 
slender and spatulate notosetae and long- 
handled uncini. Segments 6 to 8 are similar 
but lack spatulate notosetae. Abdominal seg- 
ments have handled uncini with teeth in 
pectinate rows; neurosetae are slender. Mon- 
roika differs from Manayunkia especially in 
having a weblike membrane in the crown. A 
single species is known. 
Monroika africana (Monro) is the type 
species. 
Monroika africana (Monro) new combination 
Manayunkia africana Monro (1939: 220-223, 
figs. 1-5). 
Length of the body is about 2 mm. The 
weblike tentacular membrane extends dis- 
tally for about a third of the radiolar length. 
Radioles number about 12. The species is 
known only from the Congo River, about 
