Crossland, Cyril. (1903). On the marine fauna of Zanzibar and British East Africa, from collections made by Cyril Crossland in the years 1901 and 1902. - Polychaeta. Part I. Proceedings of the Zoological Society of London. 73(1): 169-176, plates XVI-XVII.
World Polychaeta Database (WPolyDb) Willey Online Library gives the volume number as '73'
The collections referred to were made under the following circumstances: — Sir Charles Eliot, K.C.M.G., C.B., late Fellow of All Souls College, Oxford, at present H.M. Consul-General at Zanzibar and Commissioner for British East Africa, took me out with him as his private assistant in his researches on Nudibranch Mollusca. I made collections not only of this, but of the other marine groups; accounts of which, by various specialists, will appear in these 'Proceedings' from time to time. The largest collections are those of the Nudibranchiate Mollusca and Polychaete Annelids, of which groups about 150 species in each are to be described. Sir Charles Eliot has already published one part of the results of his examination of the Nudibranchs (P.Z.S. 1902, vol. ii. p. 62); other papers by various authors will shortly be ready.