62 LAMELLARIA. 



L. PATAGONICA, Smith. PI. 26, figs, 6-8. 



Shell large, very fragile, transparent hyaline, with a slight 

 milky cloudiness, showing very fine growth-striae ; whorls 3J, 

 suture deep. Diam., 1 inch. Mantle dirty yellow, with lines 

 and blotches of light vandyke brown, the under surface around 

 the foot marked with light-colored striae. 



Patagonia. 



Is possibly identical with L. Antarctica, Couth. 



Section CHELYNOTUS, Swains. 



L. TONGANA, Quoy and Gaimard. PL 26, fig. 11 ; PI. 27, figs. 

 14-16, 18. 



Shell shining white, pellucid, margin brown. Length, 28 mill. 



Animal with a thick mantle, tuberculate, the tubercles large, 

 subhexagonal, black, anteriorly produced and bifid ; foot narrow, 

 brownish. Length, 85 mill. 



Tonga Tabou. 



This and several following species belong to a section charac- 

 terized by the produced anterior portion of the mantle and 

 narrower foot. Very probably L. Berghi is a synonym of the 

 present species, or of the next one ; Coriocella nigra of Blain- 

 ville (fig. 16) is also perhaps identical, but cannot be made out 

 with certainty. L. Cuvieri, Bergh (fig. 18), appears to be an 

 individual contracted in alcohol. 



L. MAURITIANA, Bergh. PL 27, fig. 17. 



Shell elevated, yellowish white, pellucid, smooth, with distinct 

 incremental striae. Length, 1 inch. 



Mauritius. 

 L. BERGHI, Desh. PL 26, figs. 9, 10. 



White, pellucid, striate ; open below, showing the whorls. 

 Length, 16 mill. 



Mauritius. 



In the specimens before me the margin of the aperture is 

 narrowly tinted with brown. 



L. ISABELLINA, Bergh. PL 26, fig. 19. 



Undescribed. The figure represents an oval, flat, white- 

 margined species, the back light purplish with white spots. 



Length, 10 mill. 



? Philippines. 



Shell not figured. 



