338 Proceedings of tlu Royal Physical Society. 



different times on the cruise, and it is likely that when these 

 have been completely investigated they will yield some in- 

 teresting pelagic forms. The identifications have all been 

 verified by comparison with specimens in the British 

 (Natural History) Museum at South Kensington; and I 

 desire here to acknowledge the valuable assistance obtained 

 from the Conchological Department in that part of the 

 work. 



Mr Eattray has been good enough to furnish me with the 

 following notes upon the various localities at which his col- 

 lections were made : — 



"Accra, visited on January 16, 1886, presented an undu- 

 lating, barren, sandy, and spray-beaten beach, lying to the 

 east of the town, which yielded but few specimens. Marine 

 Algae were scarcely represented in this locality; even the 

 steep sandstone cliffs, up to the bottom of which the sand 

 extended, though lashed continually by a dense spray of sea- 

 water, were found perfectly barren. Fragments of cuttle- 

 bones were not uncommon on the beach. 



" San Thom4 Island, near the head of the Gulf of Guinea, 

 was visited on January 25 and 31, and on February 1, 1886. 

 The low volcanic boulders, extending from the fortress to- 

 wards the penal establishment, and separating the marshy 

 ground lying just outside the town from the sea, yielded the 

 greatest number of specimens. A few were, however, found 

 on the shores of the bay extending from the landing pier to 

 the hospital, especially on one or two low, rugged, projecting 

 rocks, which crop out here. 



''Principe Island lies not far from San Thome. Collec- 

 tions were here made on the shores of the narrow inlet, at 

 the head of which stands the town of San Antonio, on Janu- 

 ary 27, 1886. The volcanic boulders, which are strewn in 

 great numbers on the beach, were for the most part quite 

 bare and water-worn, but in some of their crevices, and in 

 the small pools in which they were imbedded, several forms 

 of interest were procured. The coast here rises abruptly 

 from the inlet, and is very densely covered with luxuriant 

 tropical vegetation, which not unfrequently reaches quite to 

 the water-mark. 



