LAURIA. 



59 



124, pi. 6, f. 16, 17 ; Novit. Conch., iv, p. 106, pi. 125, f . 16, 17. 

 — Ancey, Journ. de Conch., 1901, p. 140.— Pupa py ram id id a 

 Ponsonby & Sykes, Proc. Malac. Soc. London, i, 1894, p. 55, 

 text-fig. 



It is smaller and more fragile than the short form of an- 

 conostoma, and the base is well rounded, with scarcely any 

 trace of the compression and angulation of L. cylindracea, also 

 shared in a less marked degree by L. c. anconostoma. The 

 aperture is more rounded than in L. sempronii, and there are 

 fewer whorls in shells of equal length. 



There seems to be very little difference between specimens 

 of Madeira (figs. 7, 8) and Teneriffe (figs. 9, 10), as Wollas- 

 ton has stated ; but in both islands there is considerable varia- 

 tion in shape. The figures are from examples from the Lowe- 

 Wollaston collection. Two Teneriffe specimens measure: 



Length 2.5, diam. 1.5 mm., 5 whorls. 



Length 2.15, diam. 1.45 mm., 4% whorls. 



A young shell of slightly over 3 whorls shows two minute, 

 tubercular basal teeth (pi. 7, fig. 14). In one of a little more 

 than 4 whorls (fig. 13) the teeth are radially elongate. Both 

 from Barranca de Agua, Palma, Canaries. 



Mousson's description of the Canarian P. debilis follows. 

 It appears not to differ from fanalensis, but the type should 

 also be compared with pyramidula. Mousson's figure is here 

 reproduced. 



Pupa debilis Mousson. PI. 7, fig. 15. Shell minute, rimate- 

 perforate, globose-ovate, thin, pellucid, slightly striatulate, 

 glossy, pale corneous. Spire short, narrowly rounded, the 

 summit obtuse ; suture somewhat impressed. Six slightly con- 

 vex whorls, the last larger, rounded, somewhat inflated above, 

 equably rotund beneath, very slightly compressed at the um- 

 bilical crevice. Aperture vertical (10° with the axis), ovate- 

 semicircular, curved, and not angular at base. Peristome 

 slightly thickened, very narrowly reflected, the margins re- 

 mote, a weak compressed tooth at the right third of the pari- 

 etal interval ; right margin regularly curved, sometimes thick- 

 ened a little above ; columellar slightly reflected. Columella 

 straight or gently curved. Length 1.5 [doubtless an error for 

 2.5], diam. 1 mm. Teneriffe, Canaries {Mousson). 



