natural, history

thickened shell. Both occur in exactly the same type of habitat, have the same foodplants and exist in a limestone region.The spire of this species forms an angle of 134 D. Aperture cast at a{l angle of 50°with a horizontal base line (M. C.Z. 32459). These angles are slightly different fromthose of e. aphrodite.Specimens examined. San Cristobal: Waiai.Crystallopsis (Crystallopsis) psyche (Angas)Helix (Corasia) psyche ANGAS 1869, Proc. Zoo!. Soc. London, p. 624, p!. 48, fig. I(New Georgia).Cochlostyla (Corasia) psyche Angas, PILSBRY 1891. Man. of Conch. (2). 7: 110,pI. 23, fig. 13-14.Helicostyla (Crystallopsis) psyche Angas, PILSBRY 1894, Man. of Conch. (2), 9: 220.Crystallopsis psyche Angas, CLAPP 1923, Bull. Mus. Compo Zool., 65: 400.Remarks. I have not seen this species. Judging by both description and figure,it appears to be quite distinct.References. New Georgia (ANGAS; PILSBRY).CrystaIlopsis (Crystallopsis) balcombei (Cox)Helix (Corasia) halcomhe; Cox 1873, Proc. Zool. Soc. London. p. 565, pI. 48, fig. 4(Solomon Islands).Cochlostyla (Corasia) holcomhei Cox, PILSBRY 1891, Man. of Conch. (2), 7: 111,pI. 23, fig. 15.Helicostylo (Crystallopsis) halcomhei Cox. PILSBRY 1894. Man. of Conch. (2),9: 220.Crystollopsis holcombei Cox, CLAPP 1923, Bull. Mus. Compo Zoo!., 65: 403.Remarks. A very distinctive species and materially different from all others inthe group. It is flat with a very sharp keel. The spire forms an angle of 144°. Aperturecast at an angle of 48° with a horizontal base line (M.C.Z. 32458).Specimens examined: Malaita: Auki; Burna.Cristovala, new subgenusShell depressed-turbinate, imperforate and carinate. Columella brownish. peristomeusually brownish, carina with or without brownish coloring but when colored, it isusually as an interrupted and more or less mottled band. The remaining portions ofthe shell white, sometimes having two shades of whitish spiral bands. A single form,e. tricolor picta, is ornamented with reticulated spiral bands of brown.This subgenus differs from typical Crystallopsis by having the brownish colorationand a somewhat heavier and more porcelaineous rather than glasslike structureto the shell.The name is derived from San Cristobal.Type species, Crystallopsis tricolor Pfeiffer.188