276 MR. E. A. SMITH ON SHELLS FROM [Feb. 15, of the fifth black, the last with a narrow pale posterior margin ; sixth segment and anal appendage sanguineous. Legs black. Rostrum about reaching posterior margin of second abdominal segment, black, with the apex somewhat paler. Long. 12 milHms. Hab. Calabar. Alhed to B. superstitiosus, but differs in the colour of the an-tennae, absence of black fascia to corium, &c. EXPLAJSTATION OF PLATE XXXI. Fig. 1. Halyotnoripha versicolor J, p. 271. 2. Tyoma ■porrecta,^.21\. 3. Aspavia grandiuscula, p. 272. 4. Boschis circiimdatiis, p. 275. 5. Di/sdercus anfennatiis, p. 21b. 6. Aurivilliana lurida (^ , p. 273. 7. 2, p. 273. 8, 8 a, b. Petascelisca velutina i£ , p. 273. 9, . 2, p. 273. 10, 10 a, h. Peiascelisca foliaceipes jj, p. 274. 11. , ?,p.274. 3. On a Collection of Shells from Lakes Tanganyika and Nyassa and other Localities in East Africa. By Edgar A. Smith. [Keceived January 28, 1881.] (Plates XXXII.-XXXIV.) Tlie collection of shells about to be described has been derived from three sources. Part of it was collected by the Rev. Edward Coode Hore ; of Ujiji, and presented to the British Museum by his brother John Coode Hore, to whose liberality that institution owes the pos-session of the valuable collection which I had the pleasure of report-ing upon in these ' Proceedings ' last year. The second set, partly collected by Mr. Hore and in part by Dr. John Kirk of Zanzibar, was kindly consigned to the Museum by the latter. The third, and by far the largest, series was collected by Mr. Joseph Thomson, who has recently returned from an exploring expedition in Central Africa despatched by the Royal Geographical Society, whose council has placed the specimens in the national collection. Among the species from Tanganyika are seventeen new to its fauna, of which eleven are undescribed. To three of these attaches the greatest interest ; for they have all the appearance of being modi-fied marine types. And such in all probability is the case ; for Mr. Thomson informs me that in his opinion, jiidging from the geology of the neighbourhood, Tanganyika at some remote epoch has been au inland sea, the saltness of whose waters has almost entirely vanished, leaving only a peculiar taste which can scarcely be described as
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