1906.] OF THE THIRD TANGANYIKA EXPEDITION. 183 



12. Tanganyicia rufofilosa (Smith), var. 



Hah. South end of lake. 



One very black specimen, having evidently been stained in black 

 mud. It is very different in shape from the type, being more 

 ovate, with a longer spire, and the ixmbilicus nearly closed. 



13. Spekia zonata (Woodward). 



Hah. Niamkolo, south end of lake, on stones in shallow water. 



14. Giraudia horei Smith. (Plate X. fig. 13.) 



Hah. Mrondwe Bay, south end of lake, 10 fath. 



A few examples, rather smaller than the type. Operculum 

 ovate, horny, brown, paucisj)iral in the middle, with concentric 

 lines of growth at the outer margin. 



15. Giraudia pr^clara Bourguignat. (Plate X. fig. 14.) 

 Hah. Molii'o, west coast of south end of the lake, on rocks in 



shallow water. 



A few specimens, rather smaller than the type. The minute 

 horny operculum, 1 millim. in length, consists of a single whorl, 

 the nucleus being subcentral, but nearer the lower end. It is 

 subovate, being rather narrower below than above. 



16. Anceya rufocincta, sp. n. (Plate X. fig. 12.) 



Shell small, elongate, subulate, imperforate, yellowish horn- 

 colour, with a dark red band at the upper part of the whorls. 

 Whorls 13, slowly increasing, slightly convex ; apical whorls 

 probably smooth and convex, the two topmost remaining with two 

 spiral threads round the middle crossing the costse, which are 

 much finer and more numerous than those upon the lower volu- 

 tions. Costae strong, oblique, about twelve or thirteen u]3on the 

 penultimate whorl, those upon the body-whorl terminating 

 abruptly at a strong spiral ridge which encircles the base. In a 

 young specimen this ridge is absent, so that probably it only 

 occurs in adult shells. Aperture oblique, broadly sinuated above 

 and below ; peristome continuous, brownish, outer margin thickened, 

 a little expanded, columellar side also thickened and reflexed, with 

 a distinct tooth or fold at the upper part, joined to the outer lip 

 by a distinct callus. Operculum none ? Length 8| millim., 

 diam. 2| ; aperture 2 long, 1| broad. 



Hah. Kii^ando, towards south end of the east coast, 10 fath. 



Apparently differing from the two known species of the genus 

 Anceya in colour, form of the aperture, and the chai-acter of the 

 costse. A. giraudi Bourguignat has a palatal liration which is 

 absent in the present species. In his figures the outer lips 

 have the appearance of being drawn from broken specimens. If, 

 however, they are normal, they are very different from the labrum 

 of the present species. In a young specimen both the basal keel 

 and the columellar tooth are absent, so that these are probably 



