LITTORINA. 251 



with square light chestnut and white spots, aperture and columella 

 light purplish, the former showing the exterior markings. 



Length 18 mill. 



West Indies. 



Rather a rare form, more inflated than those which follow. It is 

 possible that L, tigrina, d'Orb. doubtfully referred to L. scabra, 

 var. nebulosa (p. 243), should be placed here. L. tigrina, C. B. Ad. 

 (Morch), and L. undulata, d'Orb. are synonyms. 

 L. ZICZAC, Chemn. PI. 45, figs. 5-7, 92. 



Sculpture varying from smooth to spirally striate, periphery from 

 obtusely angulated with slightly convex whorls to strongly carin- 

 ated with nearly flat whorls, stout or slim ; white, with a bluish 

 cast and zigzag longitudinal chestnut lines, the latter sometimes faint 

 (generally so in large specimens), but often stronger and closer, the 

 blue clouding intensified on the middle of the body whorl, and the 

 whole appearance thus becoming much darker, as though forming 

 the ground color, with the strigations white ; aperture light or dark 

 chocolate or bluish, often with a light band near the base, some- 

 times with a second superior light band. Length 10-25 mill. 



West Indie.s, Florida, Brazil. 



The light colored, larger variety, with very obtuse angle, is usu- 

 ally known in American collections as L. lineata, Lam. L. debilis, 

 Phil. (fig. 7) is a half-grown one, and L. glabrata, Phil. (fig. 92), 

 said to be from Payta, Peru, is full-grown. L. d' Orbigniana, Phil, 

 may be added. 



Of the darker colored and more angulated forms, the wide, stumpy 

 specimens have been distinguished as L. floecosa, Beck, and L. glau- 

 cocincta, Beck, L. cingulata, Pfr. L. Riisei, Morch are synonyms ; 

 whilst the narrower forms (typical ziczac) include L. angustior, 

 Morch, and its var. fasciata, L. carinta, d'Orb and L. Jamaicensis, 

 Ads. 



L. PUSILLA, Phil. PI. 45, fig. 8. 



Decollated, slightly spirally striate, bluish white, with dark chest- 

 nut longitudinal, oblique lines; last whorl obsoletely carinated; 

 aperture chocolate color, with a basal white band, and variegated 

 outer lip. Length, 5 mill. 



Sandwich Is. 

 L. COLUMNA, Jonas. PI. 45, fig. 9. 



Solid, closely spirally striated, whorls rounded, the last with deep 

 suture and without carina; whitish, with longitudinal chestnut 



