284 MR. E. A. SMITH ON SHELLS FROM [Feb. 15, 



between, and, although somewhat wavy (upon the last whorl especi- 

 ally), 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. 18.50, 

 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, 14 a.) 



Achatina {Limicolaria) rectistrigata, Smith, Proc. Zool. Soc. 

 1880, p. 346, pi. xxxi. fig. 2. 



Hah. Near Lake Tanganyika (T^owsom). 



Additional specimens show that this species varies considerably 

 in form and the relative proportion of the whorls to one another ; 

 but the regularity of the strij)ing is still maintained. Besides the 

 lines of increment, some examples are ornamented with spiral stria- 

 tion upon the upper whorls, which produces a subgranose appear- 

 ance. The following measurements will best demonstrate the 

 variation of form : — 



Length 39 millims., diam. 17, aperture 14 long. 



,, o\) ,, ,, i02> ,, 10 ,, 



» 44 ,, >» 1 7, „ lO ,, 



j> 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 — 1 (probably 1 1 or 12), very slightly eon- 

 vex, 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 



