MADEIRAN SPECIES OP LAURIA. 97 



Pupa cassidula Lowe, Aim. Mag. N. H. (2), ix, 1852, p. 

 277.— Kuester, Conchyl. Cab. p. 167, pi. 20, f. 12, 13.— 

 Albers, Malac. Mader. p. 68, pi. 16, f. 9, 10. — Paiva Monogr. 

 p. 136. — Pfr., Monogr. iii, 553; vi, 323. — Wollaston, Test. 

 Atl. p. 218. 



This form, figured from a specimen from the Lowe-Wol- 

 laston collection, stands very close to L. loweana transients. 

 In L. cassidula the upper-palatal fold is decidedly better de- 

 veloped, the whorls of cassidula are perhaps a little shorter 

 and the form thus more compact. The aperture is shorter. 

 L. I. transiens is supposed to be from northern Madeira, 

 while this species is from the south. Wollaston states that 

 cassidula " is paler and a little more coarsely striated [than 

 L. loweana transiens] ; and the lateral denticle of its outer 

 lip is somewhat more prominent internally, causing the sinus 

 to be less open, or more narrowly closed in behind." 



31. Lauria concinna (Lowe). PL 11, figs. 4, 5, 6. 



The shell is perforate and rimate, cylindric, with short, 

 convexly-conic, obtuse summit, chestnut-brown, with the base 

 and a narrow band on the upper surface olive-buff. Surface 

 slightly shining, very closely and finely but strongly striate, 

 the striation weak on the last whorl, which is smoothish at the 

 periphery and beneath. Whorls but slightly convex. 

 Aperture 5-plicate. Angular lamella very high, oblique, flar- 

 ing outward nearly to the tooth of the outer lip, not con- 

 nected with the lip-insertion. Parietal lamella also flaring out- 

 ward. Columella!* lamella strong, emerging, horizontal. 

 Lower-palatal fold strongly developed, immersed, latero- 

 dorsal. No upper-palatal fold. Subcolumellar lamella low, 

 tubercular, so deeply immersed that it is only partially 

 seen in an oblique view in the mouth. Peristome brownish, 

 narrowly expanded and a little thickened, bearing a narrow 

 but well developed tooth above. 



Length 3.7, diam. 1.7 mm. ; iy.> whorls. 



Length 3.25, diam. 1.75 mm. ; 6y 2 whorls. 



Madeira: in the highest elevations, on broken sticks and 

 small stones near the minute, trickling streams, as well as 



