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Show 284 MR. E. A. SMITH O N SHELLS F R O M [Feb. 15 , between, and, although somewhat wavy (upon the last whorl especially), do not take a large zigzag pattern. Most specimens are more or less streaked with opaque golden lines in the direction of the lines of increment, which when falling upon the dark stripes tell very vividly. 17. ACHATINA (LIMICOLARIA) CAILLAUDI, Pfeiffer. (Plate XXXIII. fig. 13.) Achatina (Limicolaria) caillaudi, Pfeiffer, Zeitsch. f. Mai. 1850, p. 86 ; Mon. Hel. vol. iii. p. 386, vol. iv. p. 584, vol. vi. p. 208 ; Martens, Mai. Blat. 1865, vol. xii. p. 197. Sab. Near Lake Tanganyika {Thomson). This species varies greatly in breadth and length, as may be judged from the measurements given by Martens in the work above mentioned. One of the specimens from Tanganyika is remarkably slender, having a length of 71 millims. and a diameter of 20, the aperture being 21 long. The species has not hitherto been recorded from so southern a region. 18. ACHATINA (LIMICOLARIA) RECTISTRIGATA, Smith. (Plate XXXIII. figs. 14, lAa.) Achatina {Limicolaria) rectistrigata, Smith, Proc. Zool. Soc. 1880, p. 346, pi. xxxi. fig. 2. • ; Hab. Near Lake Tanganyika (Thomson?). Additional specimens show that this species varies considerably in form and the relative proportion of the wdiorls to one another; but the regularity of the striping is still maintained. Besides the lines of increment, some examples are ornamented with spiral striatum upon the upper whorls, which produces a subgranose appearance. The following measurements will best demonstrate the variation of form :- Length 39 millims., diam. 17, aperture 14 long. ?» "" J> >> to^i ,j 15 ,, » 44 „ „ 17, „ 16 „ » 41 „ „ 14, „ 14 „ The last measurements are of a specimen from near Ujiji, sent by Dr. Kirk to the British Museum, and received by him from Mr. Hore. 19. SUBULINA LENTA. (Plate XXXIII. fig. 15.) Subulina lenta, Smith, Ann. & Mag. Nat. Hist. ser. 5 vol. vi p. 428 (1880). Shell subulate, imperforate, very slowly enlarging, very elongate and narrow. Whorls-? (probably 11 or 12), very slightly convex, covered with a thin, glossy, pale olivaceous epidermis, varied at intervals with darker oblique stripes. Suture simple, rather oblique and deepish. Sculpture consisting of fine oblique and feebly flexuous lines of increment, faintly puckered at the upper extremity. Aperture small, occupying less than one fifth of the entire |