70 PERCY SLADEN TRUST EXPEDITION 
3. Hydroides homoceros, n. sp. M. Z. 
4 Xn heteroceros, Grube, Z. RK. (Red Sea, Ceylon). 
5. - bifurcatus, n. sp. M. 
6. tA monoceros, Gravier, Z. R. (Red Sea). 
7. Eupomatus exaltatus, Marenz. Z. R. (Japan, Ceylon). 
8 ms spinosus, n. sp. R. 
9. Pomutostegus stellatus, Abildgaard, R. (W. Indies, Florida, Red Sea). 
10. Spirobranchus giganteus, Pallas, M. Z. R. (W. Indies, Florida, Red Sea). 
Lil, te ys var. turbinatus, nov. M. 
12. i gardineri, n. sp. SC. 
13. fe sempert, Morch, Z. R. (Philippine Is., Ceylon). 
14. Fy 6 var. acroceros, Willey, Z. R. (Ceylon). 
15. As i » aceros nov. SC. 
16. £8 contieret, Gravier, Z. R. (Red Sea). 
U7, a maldiviensis, n. sp. M. 
Pomatoleios, ng. 
18. s crosslandi, n. sp. Z. 
19. Vermilopsis pygidialis, Willey, M. Z. R. (Ceylon). _ 
20. Salmacina dysteri, Huxley, Z. R. (Atlantic, Mediterranean, Red Sea, English 
Channel, N. Sea). 
21. Protula tubularia, Mont. V. (Atlantic, Mediterranean, English Channel, 
N. Sea). 
22. Protula intestenum, Lam. SC. Z. (Mediterranean). 
23. Spirorbis papillatus, n. sp. Z. 
2A. be levis, Quatrefages R. (Mediterranean). 
25. Pa cornuarietis, Phil. R. (Mediterranean). 
Details as to the localities from which specimens were collected have been recorded 
at the beginning of the general description of each species. With regard to distribution 
it will be noticed in the above list that several Serpulids common to the Red Sea and 
Zanzibar have also been recorded by Prof. Willey from Ceylon. The two Mediterranean 
species of Spirorbis, both collected at Suez, may very easily have been brought into the 
Red Sea by way of the canal, a method of entry which seems quite certain in the case of 
Hydroides norwegica, which was found growing on ships dry-docked in Suez on their 
arrival from Alexandria. Hupomatus exaltatus also has an interesting distribution. This 
species was founded by Marenzeller on one specimen from Japan in 1885, and was not 
recorded again until twenty years later, when another single specimen was described 
by Prof. Willey from the Gulf of Manaar, although previously to this Mr Crossland had 
collected the three specimens recorded here from the neighbourhood of Zanzibar. 
As usual in the Serpulidee, there is an enormous amount of variation; this is no doubt 
accentuated by the prolonged action of preservatives, and emphasises the importance 
of more systematic work being done on fresh material. which is sufficiently plentiful 
to allow numerous specimens to be compared. In this paper which is of necessity almost 
wholly systematic, I have endeavoured to tabulate at the beginning of the description of 
