92 
48. 
49. 
50. 
51. 
Fig. 
Fig. 
Fig. 
PERCY SLADEN TRUST EXPEDITION 
ScumMarpa, Lupwie, K. “Neue Wirbellose Thiere,” i, 11, 1861. 
Souter, A. “ Revision des Annélides de la région de Cette, fas. i.” Trav. de l’instit. de Zoologie 
de Montpellier et de la Station maritime de Cette, Mémoire no. 10, 1902. 
Wittey, ArrHurR. Pearl Oyster Fisheries, Supplementary Report xxx, “On the Polycheta.” 
Royal Society, 1905. 
ZELENY, C. “Experiments on the Control of Asymmetry in the Development of the Serpulid 
Hydroides dianthus.” Journ. Morph. xxii, 1911. 
EXPLANATION OF PLATES 8 AND 9. 
PLATE 8. 
. 1. Hydroides homoceros, u. sp. 1a, Operculum, x 24; 16, collar seta, x 300; 1c, abdominal 
seta, x 375. 
. 2. Hydroides heteroceros, Grube. 2a, Operculum with spines open, x17; 2b, operculum with 
spines closed, x 17; 2c, collar seta of a young specimen, ? same species, x 300. 
. 3. Hydroides bifurcatus, n. sp., operculum, x 24. 
. 4. Hupomatus exaltatus, Marenz., operculum, x 24. 
. 5. Hupomatus spinosus, n. sp., operculum, x 24. 
. 6. Spirobranchus giganteus, Pallas. 6a, Ventral lobe of collar, x19; 6b and c, two extreme 
forms of collar sete, x 300; 6d and e, two forms of abdominal set, x 300. 
. 7. Spirobranchus gurdineri, n. sp. 7a, Anterior end photographed from ventral side, showing 
collar, operculum, &., x 3; 76, collar seta, x 300; 8c, thoracic uncinus, x 300; Sd, front view of 
anterior end of same to show the gouge-shaped tooth, x 400; 8e, abdominal uncinus, x 300; 
8 f, abdominal seta. 
PLATE 9. 
8. Spirobranchus contiert, Gravier. 8a, Thoracic uncinus, side view, x 220; 8b and ¢, the same, 
x 400—B, side view, c, front view. 
g. 9. Spirobranchus maldivensis, n. sp. 9a, Operculum and pedicle, ventral view, x 8°5; 9b, charac- 
teristic collar seta, x 300; 9c, simple collar seta, x 300; 9d ande, lateral and front views 
respectively of anterior end of thoracic uncinus, x 300; 97, abdominal seta, x 300. 
10. Pomatoleios crosslandi, n. sp. 10a, Anterior half of animal, x 17; 10, thoracic seta, x 220; 
10c, abdominal seta, x 220; 10d, anterior end of thoracic uncinus, front view of, x 220. 
ll. Vermiliopsis pygidialis (Willey). Operculum, x17; lla, with calcareous incrustation ; 
116, with incrustation removed. 
g. 12. Spirorbis papillatus, n. sp. 12a, Operculum with large ova, x 48; 126, operculum with 
embryos, side view, x 48; 12¢, collar seta, x 375; 12d and e, sete from second and third thoracic 
fascicles respectively, x 375. 

