52 MR. E. A. SMITH ON SHELLS [Jan. 17 4. On the Shells of the Albert Nyauza, Central Africa, obtained by Dr. Emin Pasha. By Edgar A. Smith. [Eeceived December 5, 1887.] Among the valuable collections of Natural History recently received from Dr. Emin Pasha are a few shells which he collected in the Albert Nyanza, probably from the eastern side of the Lake. They are referable to : — 1. Melania tuherculata, Miiller. 2. Melania liricincta, n. sp. 3. Paludina unicolor, var. 4. Bythinia alberti, n. sp. 5. Planorbis stanleyi, n. sp. It is not surprising that three out of these five species should be undescribed, as, with one exception, no collections of shells have ever reached this country from this particular region. In 1866 Mr. Henry Adams gave a list, in the 'Proceedings' of this Society (p. 37-^), of a collection of shells made in Central Africa by Sir Samuel Baker, the discoverer of the lake. I am informed by that gentleman that all the shells mentioned by Mr. Adams, and which he has presented to the British Museum, came from the Albert Nyanza. Through the kindness of the Rev. Horace Waller I have had the opportunity of examining a series of shells from the same locality, which he also received from Dr. Emin. Among them are examples of two new species, a Cleopatra and a Bythinia, which are not repre-sented in the two other collections. Altogether fifteen species are now known from this particular lake, and of these seven appear at present to be peciiliar to it. The remaining eight have all been recorded from different parts of the Nile, and one species, Melania tuherculata, is also known from three of the other large Central African lakes, namely Nyassa, Tanganyika, and Victoria Nyanza. The Planorbis sudanicus also occurs in Lake Tanganyika. The following is a complete list of the known species from the Albert Nyanza. 1. Melania tuberculata, Miiller. A large series of this remarkably distributed species has been sent by Dr. Emin Pasha. A dark purplish brown or black is the pre-vailing tint of most of the specimens, with only slight indications of the spotting which is characteristic of the species. Some of the examples, however, possess the usual style of colouring, being pale olive or dirty white and dotted and spotted with red. 2. Melania liricincta, n. sp. Testa elongata, turrita, sub epidermide nigro-fusca albida ; anfr actus persistentes 5, parum convexi, interdum in/erne leviter tumidi,
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