OCR Text |
Show 344 MR. E. A. SMITH ON SHELLS [Apr. 20, of 2 to spinners; h, length of $ to extremity of abdomen; /, length of cS to extremity of abdomen ; g, length of $ to spinners ; 16 b, profile of cephalothorax ; 16 c, abdomen of cS o n upperside; 16 c, abdomen of 5 in profile. Fig. 17. Argyrodes obtusa, sp. n., Spider in profile. b, profile of cephalothorax; c, caput from in front; j, length of Spider to extremity of abdomen; k, length of Spider to spinners. 17 cc'. Argyrodes amplifrons, sp. n., Spicier in profile. cl', length of Spider to spinners; e', length of Spider to extremity of abdomen; 17 b', profile of cephalothorax; c', caput from in front; ci, profile of spider ( § ) ; e', extremity of abdomen ( J ) ; /', extremity of abdomen (cS), from below; g, length of $ to spinners; h, length of 2 to extremity of abdomen. 13. Argyrodes sextuberculata, sp. n., Spider in profile. a, profile of cephalothorax; b, abdomen from above; c, length of Spider to extremity of abdomen. 14. Argyrodes ululans, sp. n., Spicier in profile. a, profile of caput; b, caput from in front; c, length of Spicier ( $) to spinners ; d, length of Spider ( J1) to extremity of abdomen ; c, length of 2 to extremity of abdomen ; /, length of § to spinners. 18. Argyrodes itifelix, sp. n., Spicier in profile. a, abdomen on upperside ; b, length of Spider to spinners ; c, length of Spider to extremity of abdomen. 19. Argyrodes felix, sp. n. a, Spider in profile ; b, length of Spider to spinners; c, length of Spicier to extremity of abdomen. 20. Argyrodes nigra, sp. n. a, Spicier in profile; b, Spicier in profile, from upperside; c. length to spinners ; el, length to extremity of abdomen. 4. On the Shells of Lake Tanganyika and of the Neighbourhood of Ujiji, Central Africa. By E D G A R A. SMITH. [Received April 6, 1880.] (Plate XXXI.) In the year 1877 I had the pleasure of communicating to the Society a paper on the shells found in Lake Nyassa. It is now my privilege to lay before it an account of the known mollusks inhabiting another of the large African lakes, namely Tanganyika. Mr. Edward Coode Hore, of the London Missionary Society's Tanganyika Mission, stationed at Ujiji, sent a collection of shells to his brother, Mr. John Coode Hore; and the latter has liberally presented them to the British Museum in his brother's name. The only shells hitherto recorded from this particular region were collected by Captain Speke some twenty years ago, and described in these 'Proceedings' (1859) by Mr. S. Woodward; they were four in number, viz. Pleiodon spekei, Lithoglyphus zonatus, Melania nassa, and Unio burtoni. Tbe last of these is the c.nly form not included in Mr. Hore's collection. The latter comprises twenty-one species, nine of which are new and interesting forms. Of these I would particularly call attention to Tiphobia horei and Neothauma tanganyicensis, both of which are new |