LAURIA. G5 



none iu the larger immature shells seen. There is an evident 

 tendency to lose the folds in this species. 



In a fully formed embryo, 0.85 mm. in diameter, of V/2 

 whorls, there is a quite short but rather high angular lamella 

 only (fig. 6). 



Mr. Burnup informs me that he has observed two pairs of 

 tentacles in the living animal. 



13. Lauria cryptoplax (Mel v. & Pons.) . PL 8, figs. 7, 8, 9, 10. 

 The shell is minutely perforate and shortly rimate, cylin- 



dric-tapering, with obtuse summit ; brown, glossy and smooth- 

 ish. The whorls are slightly convex, the last with rounded 

 base. Peristome narrowly reflected, thin, a little thickened 

 within. Angular lamella is small, slightly higher at the outer 

 end, where it gives off a small spur towards, but not quite 

 reaching, the lip-insertion. It penetrates as a well-developed 

 thread from a third to a half whorl inward. Columellar 

 lamella appears deep within as a small prominence. 



Length 3.3, diam. 1.5 mm. ; fully 6 whorls. 



Length 3.36, diam. 1.95 mm. (fig. 9). 



Length 3.12, diam. 2 mm. (Burnup). 



Cape of Good Hope: Kragga Kama, Port Elizabeth (Craw- 

 ford, Reeve) ; The Gorge, Somerset East (H. C. Burnup). 



Pupa cryptoplax Melvill & Ponsonby, Ann. Mag. N. H. 

 (7), iv, 1899, p. 198, pi. 3, f. 11; (8), i, 1908, p. 71, pi. 1, f. 

 1, 2.— Burnup, A. M. N. H. (8), vii, 1911, p. 402. 



Very close to L. dadion, the adult stage scarcely distin- 

 guishable ; but the armature of the immature stages is stronger 

 and persists longer. 



A half-grown specimen has three strong basal laminae at 

 intervals of 14 whorl. The angular and columellar lamellae 

 are long and strong (pi. 8, fig. 8). A shell of 5y 2 whorls, 

 therefore within a half-whorl of maturity, still shows two 

 moderately developed basal laminae. 



14. Lauria tabularis (Melv. & Pons.). PI. 8, figs. 11 to 15. 

 The shell is long-ovate, minutely perforate, rimate, light 



brown, smoothish ; whorls are somewhat convex, the last com- 

 pressed below, the base being pinched up in a short, rounded 



