fid ADKIKAN SPECIES OF LAURIA. 115 



4(>. Laikia gebba (Lowe). PI. 14, figs. 4, 5, 6, 7. 



A very small, compact, very shortly cylindric shell, obtusely 

 rounded at both ends, the diam. about : y { of the leng'th ; 

 coarsely ribbed, the ribs curved, rather widely spaced on the 

 last one or two whorls, closer and regular on the preceding 

 whorls, the first 1% being smooth. The whorls are only 

 slightly convex, but tend to project a little above the suture; 

 the last one is slightly compressed below the periphery, and 

 slowly ascends to the aperture. The aperture is somewhat 

 trilobed, the lower lobe widely open, upper lobes smaller, 

 contracted. The emerging angular lamella bears a lobe bent 

 towards the sinulus, is not connected with the lip-insertion, 

 and penetrates to the dorsal side. The parii tal lamella is 

 higher than the <i)i!jnl<ir, and emerges nearly to the edge of 

 parietal callus; it enters straightly, then becomes much lower 

 ami turns towards the axis, penetrating to the dorsal side. 

 The columella!* lamella is broad, horizontal, and emerges 

 weakly to the peristome ; it descends as it enters, and pen- 

 etrates deeply. Within the outer lip there is a strong mar- 

 ginal tooth defining the sinulus, extending inward in a supra- 

 palatal fold (pi. 14, fig. 7, sp.) a long, strongly sinuous, high, 

 deeply immersed upper-palatal fold (fig. 7, up.) ; a lower 

 oblong lower-palatal fold ( fig. 7, Ip), also deeply immersed. 

 Far within the basal mai'gin there is an oblique basal fold 

 (pi. 14, fig. 6 &.), not visible in the aperture. The peri- 

 stome is reflected, somewhat retracted at the sinulus. Par- 

 ietal callus not very thick. 



Length 2, diam. 1.4 mm.; 6 1 ,:' whorls. 



Length 2.1, diam. 1.4 mm.; 6V» whorls. 



Madeira : at the base of lofty, perpendicular rocks to- 

 wards the head of the Ribeira de Sta. Luzia, among loose? 

 vegetable detritus. Pleistocene in the Canical beds fWol- 

 laston). 



Pupa gibba Lowe. Ann. .Mag. \. 11. (2) ix, 1852, p. 277; 

 Proc. Zool. Soc. Lond. 1854, p. 213.— Wollaston, Test, Atl. 

 p. 235. 



Differs from all others by its diminutive size, wide contour. 



