124 pyramidellid/t:. 



Inferieure (Cailliaud) ; Spezzia (J. G. J.) ; and Algiers 

 (WeinkauflP). 



This is a common and therefore variable species. It 

 may be reco^nized^ in comparison with 0. albella, by its 

 more oval and less cylindrical shape, its usually thinner 

 textui'e and greater lustre, more convex whorls, deeper 

 suture, and having the mouth rounded and never angu- 

 lated at the base ; the last whorl is larger in proportion 

 to the rest. Shetland specimens are very fine. Scalari- 

 form and stunted distortions sometimes occur. 



Macgillivray described it as 0. scalaris, which specific 

 name would be entitled to priority, if Philippi had not 

 used it for another well-known species. It is apparently 

 the Rissoa glabra of Brown, and Turbonella transparens 

 of Leach. The fry is probably Helix resupinata of 

 ^lontagu, from Walker^s figure 24. 



8. O. pal'lida *, Montagu. 



Tv.rho faUidus, Mont. Test. Br. (ii.) p. 325, t. 21. f. 4. 0. culvnotdcs, F. 

 & H. iii. p. 273, pi. xcv. f. 1-3. 



Body white, covered vrith minute yellow specks : snout 

 narrow, expanded and rounded in front, marked down each 

 side with a pale-yellow fine : tentacles bevelled and pointed 

 like an awl ; each has also a yellow longitudinal line ; tips 

 inflated and white ; eyes placed somewhat apart : foot short, 

 truncated, and sHghtly notched in front, where it is indistinctly 

 auricled at each corner, terminating behind in an abrupt and 

 short point. 



Shell somewhat spindle-shaped, in consequence of the 

 elongation and angularity of the base, rather solid, nearly 

 opaque, and moderately glossy: sculpture, fine and close-set 

 microscopical spiral striae ; these may be detected with a lens 

 of ordinary power : colour milk-white, T\T.th a faint orange or 

 purphsh tinge on the upper part of hve specimens, derived 

 from that of the liver; immature specimens are often yel- 

 lowish : s2-)ir€ finely and regidarly tapering to a blunt point ; 



* Pale. 



