LAURIA. 



47 



10 



Finely, sharply striate; generally banded, or brownish 



above the periphery. Azores. L. fasciolata, no. 51 



Smoothish or obsoletely striatulate, of uniform, pale 



tint (7) 

 Spain. L. fagoti, no. 5 



Madeira, Canaries. L. fwnalensis, no. 7 



Ovate, most minutely striate, silky; Sardinia. 



L. vulcanica, no. 3 

 Cylindric-ovate, weakly striatulate (9) 

 Thread inward from the angular lamella very weak; 



Europe. L. sempronii, no. 4 



Thread well developed ; Caucasus. L. caspia, no. 6 



Abyssinia. L. bruguierei, no. 8 



Mt. Kenia, British East Africa. L. desiderata, no. 9 



Island of Bourbon. L. bourbonensis, no. 10 



South Africa (11) 

 Angular lamella long, curving into the interior (12) 



' Angular lamella short ; lip rather wide ; base pinched 

 out in a short blunt keel behind the basal lip. 



I 



L. tabularis, no. 14 



Base subangular; length 3.4 to 4.24 mm. 

 12-| L. farquhari, no. 11 



Base narrowly rounded; length 3 to 3.5 mm. (13) 



Radial basal laminae large in the early neanic stage, per- 

 sisting smaller nearly to the adult stage. 

 13 «| L. cryptoplax, no. 13 



Radial basal laminas veiy small, present only in the 

 early neanic stage. L. dadion, no. 12 



I 



1. Lauria cylindrica (Da Costa). PL 6, figs. 1 to 8. 



The shell is perforate and shortly rimate, cylindroid, taper- 

 ing slowly upward, or ovate, the summit rounded, obtuse; 

 semitransparent-cinnamon, glossy, scarcely striate. The whorls 

 are moderately convex, the last ascending somewhat in front, 

 compressed at base, forming a blunt basal keel. The truncate- 

 oval aperture is slightly oblique, the peristome reflected, white 



