722 
ZOOLOGICAL LITERATURE. 
A. With dorsal branchiaa (Tribe 7'. hranohiaUt). 
) 3 pairs 
2 pairs 
1 pair 
b. Dorsal brancliiaj pectinated^ median 
c. Dorsal brancliii© cirriform. 
* Buccal cirri simple 
* Buccal cirri pinnate 
d. Dorsal branchia3 ciiTiform and pinnate .... 
B. No dorsal branchia3 (Tribe 7'. ahranchiatd ) .... 
IX. Body in one region (Tribe Ileterotcrehelleit). 
A. Dorsal brancliiee arborescent < 5 
I 2 pairs 10. Ilcterophysdui. 
B. Branchiae cirriform 11. Ileterophcnacia. 
Genera incert^ sedis 7 : Rhytocephaliis, Amphictds, Polycirrus j 
Sabellina, AnisomelaSf Piratesa, Linnara. 
Family XXVI. SERPULEA (3 tribes, 21 genera). 
I. Head without an operculum. 
A. Regions distinct (Tribe S. Sabellea), 
a. Tube membranous. 
* Branch ite with a circular base. 
a. Cirri free. 
a. No caudal eyes 1. Saballa. 
b. Caudal eyes. 
1. Antennae present. 
With a collar 2. Oria. 
With no collar 3. Amphiylma. 
2. No antennae 4. Fubricia. 
Branchial cirri united 6. Chonea, 
* Branchiae with a spiral base. 
a. A single branchia in spiral 6. Spiroyrapha. 
jS. Both branchiae in spiral 7. Distylia. 
b. Tube calcareous. 
* Branchiae with a spiral base 8. Protula. 
* Branchiae with a circular base 9. Psyymobranchus. 
B. Regions indistinct (Tribe S. Ileterosabellea'). 
a. With feet. - - 
* Brancliial cirri free. 
u. With barbules 10. Anamceb(^a. 
p. No barbules 11. Amphicorine. 
* Branchial cirri united 12. Myxicola. 
b. Without feet. 
Branchiae with barbules 13. Oyvvtosoma. 
Brancbiac without barbules 14. Phoronis. 
II. Head with an operculum (Tribe Serpulea prop.'), 
A. Two or more false opercula 15. FiUyrana. 
B. With true opercula. 
a. Tube completely rolled up 10. Sjurorbis. 
b. Tube more or less sinuous. 
* Two symmetrical opercula 17. Codonytcs. 
1. Terebella. 
2. Physelia. 
3. Idalia. 
4. Terebellkles. 
6. Phenacia. 
6. Sabellidcs. 
7. Isolda. 
8. Apnemnea. 
9. Hcteroterehella. 
