718 
ZOOLOGICAL LITERATURE. 
n. BranchiaB only on the first somites. 
A. No tentacles 4. Dodecacereea. 
B. One pair of tentacles i ^ . 6. Heterocirrus. 
C. Three pairs of tentacles 6. Nagaranseta. 
Family IX. CIILORyEMEA (2 tribes, 6 genera). 
I. Body covered with hairs (Tribe O/iZoriemea 1. Chlorcema. 
II. Body without hairs, or with very short hairs. 
(Tribe Chlorcemca nuda). 
A. Head protected by setm. 
a. All the feet biramose. 
* Head very distinct 2. Siphostomum. 
t Head indistinct 3. Pherusa. 
b. Only the first feet biramose 4. Lophiocephala. 
B. Head entirely uncovered 6. Brada. 
Genera iNCEBTie sedis 4 ; Spinther, Flemingia, Stglaroides, Tecturella. 
Family X. NEREIDEA (2 tribes, 4 genera). 
I. Body forming one region (Tribe Neretdea prop.). 
A. Feet uniramose 1. Lycastis. 
B. Feet biramose 2. Nereis. 
II. Body forming two regions (Tribe Heteronereidea). 
A. All the setrn like those of Nereis 8. Nereilepas. 
B. Part or the whole of the setae remiform 4. Ileteronereis. 
Genera incertaj sedis 2 : 3Iicronereis, Zotlica. 
Family XI. SYLLIBEA (31 genera). 
I. Feet moveable. 
A. With dorsal and abdominal cirri, 
a. No tubercles on the body. 
* Gizzard armed, 
a. 4 antennae. 
а. 12 tentacles 1. Syllidia. 
б. No tentacles 2. Prionognatlms. 
/3. 3 antennae 3. Gnathosyllis. 
* Gizzard unarmed. 
a. Head and buccal somite distinct. 
а. With frontal lobes. 
** Antennae 6 4. Pterosyllis. 
** Antennae 4 6. Brania. 
* * Antennae 3. 
1. Tentacles 8 6. Procoma. 
2. Tentacles 4. 
Eyes 4 7. Syllis. 
Eyes 6 8. Ehlet'sia. 
3. Tentacles 0 9. Exoyone. 
** Antennae 2 ; 10. Gruhea. 
б. No frontal lobes, 
** Antennae 4. 
1. Tentacles 16 11. Kefersteinia. 
2. Tentacles 0 12. Eucerastes. 
