382 
PACIFIC SCIENCE, Vol. V, October, 1951 
for five species, all marine, of which two 
are from the Pacific. 
P. elongatus (Treadwell) (1906: 1178, 
figs. 73-75), from off Molokai Island. 
See Hartman (1942: 134-135, figs. 
b-d), for emendation. 
P. mucronatus (Moore) (1923: 243-245, 
figs. 43-44), from southern California. 
See Hartman (1942: 134, figs, a, h-j) 
for review. 
In addition, single species come from 
deep water off Florida and Norway, and 
from the Antarctic Ocean. 
12. Monroika, a new name, is proposed for a 
single aberrant fresh- water species, M. 
africana (Monro), 1939, from the Congo 
River (see below). 
KEY TO GENERA AND PACIFIC SPECIES OF 
FABRICINAE 
1. Thoracic neuropodia with long- 
handled uncini accompanied by 
pennoned setae (Hartman, 1942, 
fig. /) Potamethus 12 
1. Thoracic neuropodia lack pennoned 
setae 2 
2. Tentacular radioles free, without a 
weblike or palmate membrane .... 3 
2. Tentacular radioles united for some 
distance by a weblike membrane. . 9 
3. First setigerous segment with palmate 
and slender setae; alimentary tract 
recurved so that anus is anteroven- 
tral; first 7 setigers lack ventral un- 
cini Caohangia 
3. Palmate setae absent; anus opens pos- 
teriorly 4 
4. Tentacular radioles vary in length; 
abdomen with 60 or more segments 
Dialychone 
4. Tentacular radioles otherwise; abdo- 
men with few to many segments . . 5 
5. Abdomen with many segments; tho- 
racic collar well developed and bi- 
lobed Jasmineira pacifica 
5. Abdomen with few segments or a 
limited number 6 
6. Radioles unbranched 
Manayunkia 13 
6. Radioles branched in pinnate arrange- 
ment 7 
7. With 7 thoracic setigerous segments 
Oriopsis 
7. With 8 (except in Pahricia ventrilin- 
guatd) thoracic setigerous segments 8 
8. Abdominal uncini with long handle 
(Fig. 5); abdomen usually with 3 
segments (Fig. 2) . . . .Pahricia 17 
8. Abdominal uncini avicular or short 
handled; abdominal segments 3 to 
5 or more Oridia 21 
9. Abdomen with a deep ventral groove 
at posterior end of body 
Euchone 25 
9. Abdomen without such groove at 
posterior end of the body 10 
10. Tentacular radioles are simple un- 
branched filaments 
Monroika africana 
10. Tentacular radioles have pinnately ar- 
ranged filaments 11 
11. Some thoracic notopodial setae broad 
and spatulate Chone ....... 27 
11. Broad spatulate setae absent 
Megachone aurantiaca 
12. Thoracic collar oblique; thoracic 
spatulate setae with a short mucro 
Potamethus mucronatus 
12. Thoracic collar nearly straight; thor- 
acic spatulate setae with a long mu- 
cro Potamethus elongatus 
13. With few tentacular radioles 14 
13. With many, 16 or more, pairs of ten- 
tacular radioles 15 
14. With 4 pairs of radioles 
. .Manayunkia estuarina and M. polaris 
14. With 6 pairs of radioles 
Manayunkia caspica 
15. With 16 to 20 pairs of tentacular 
radioles 16 
15. With 24 to 36 pairs of tentacular ra- 
dioles Manayunkia haicalensis 
