Annelids of Marshall Islands — Reish 
215 
the Marshall Islands. Europe, Atlantic Ocean, 
eastern Pacific Ocean, Japan, and Marshall 
Islands. 
Sphaerosyllis pirifera Claparede 
Fauvel, 1923, pp. 301-302, fig. 115 1-p; 
Reish, 1959, p. 80. Eniwetok : Bogombogo 
(O). This is the first report of the species from 
the Marshall Islands. Atlantic Ocean, Mediter- 
ranean Sea, eastern Pacific Ocean, and Marshall 
Islands. 
Parasphaerosyllis indica Monro 
Monro, 1937, pp. 273-275, fig. 8; Hartman, 
1954^, p. 629; Rioja, 1959, pp. 246-251, figs. 
21-31; Hartmann-Schroder, 1965, p. 115. 
Eniwetok: Bogombogo (L) and by Hartman 
from Lidilbut (O). Arabian Sea, Cauda, An- 
nam, Marshall Islands, and Gulf of Mexico. 
Family nereidae 
KEY TO THE SPECIES FROM MARSHALL ISLANDS 
1. Peristomium with parapodia and setae; pro- 
boscis lacks paragnaths 
Micronereis eniwetokensis 
1. Peristomium with only tentacular cirri; 
proboscis with paragnaths 2 
2. Paragnaths soft Ceratocephala corallicola 
2. Paragnaths horny . 3 
3. Paragnaths present only on distal ring of 
proboscis Ceratonereis ..... 4 
3. Paragnaths present on both rings of pro- 
boscis . 6 
4. Prostomium with deep cleft between an- 
tennae Ceratonereis mirabilis 
4. Prostomium without cleft . 5 
5. Posterior neuropodial falcigers with termi- 
nal end fused to stalk 
Ceratonereis pachychaeta 
5. Posterior neuropodial falcigers not fused 
Ceratonereis costae 
6. All paragnaths conical 7 
6. Some paragnaths transverse, or pectinate 
9 
7. Posterior notopodial lobes with homo- 
gomph falcigerous and spiniger setae 
Nereis zonata perisca 
7. Posterior notopodial with only spiniger 
setae Neanthes 8 
8. A broad belt of paragnaths around the oral 
ring Neanthes arenaceodentata 
8. Area VI with 2 or 3 paragnaths in a row; 
area VI-VIII with 3-5 paragnaths 
Neanthes dawydovi 
9. Transverse paragnaths on area VI 
Perinereis 10 
9. Pectinate paragnaths on maxillary ring 
Platynereis 12 
9. Paragnaths are conical, pectinate, and 
transverse .... Pseudonereis .... 13 
10. Area I of maxillary ring with a group of 
4-12 conical paragnaths 
Perinereis nigropunctata 
10. Area I with 1-2 paragnaths 11 
11. Tentacular cirri extend to 5-6 segments; 
area I with 1-3 paragnaths 
Perinereis cultifera 
11. Tentacular cirri extend to 8-9 segments; 
area I with 2 paragnaths 
Perinereis helleri 
12. Area VI with 1-2 curved rows of para- 
gnaths ; blade of falciger with pointed tip 
or slightly rounded Platynereis dumerlii 
12. Area VI with 1 row of paragnaths; blade 
of falciger broadly rounded 
Platynereis pulchella 
12. Area VI with oval cluster of pectinate 
paragnaths; known only from epitokal 
stage at Eniwetok Platynereis polyscalma 
13. Area V with 1 paragnath; area VI each with 
a large paragnath 
Pseudonereis gallapensis 
13. Area V lacking paragnaths; area VI each 
with a row of paragnaths 
Pseudonereis anomala 
Ceratocephala corallicola , new species 
Fig. 4 {1-5) 
Eight complete specimens were collected from 
Bogen Island at Eniwetok Atoll on September 
12, 1956. They ranged in size from 5 to 20 mm 
in length and possessed from 38 to 112 setig- 
erous segments. The holotype measures 12 mm 
in length, 0.5 mm in width, and possesses 90 
setigerous segments. The prostomium bears four 
pairs of eyes in trapezoidal arrangement, with 
the anterior pair farther apart. The anterior part 
is crescent in shape and the posterior ones 
