112 PLACOSTYLUS, FIJI IS. 



coarseness, is perhaps never so fine as in the variety rugatus, and the 

 lip is less developed than in var. crassilabrum. In P. elobatus the lip 

 is merely a little expanded, not reflexed as in gracilis. 



\ 



Var. RUGATUS (Garrett). PI. 42, figs. 89, 90. 



Rather shorter than P. gracilis, and with perceptibly finer spiral 

 corrugation ; whorls 4^ ; aperture large, white, the lips white or 

 faintly cream-tinted ; cuticle pale buff, with olive spots and streaks, 

 the spire pink or whitish. 



Alt. 4.3, diam. 22-| ; longest axis of aperture 29 mill. 



Alt. 41, diam. 22 ; longest axis of aperture 27^ mill. 



Alt. 40, diam. 21^; longest axis of aperture 27 mill. 



Vanua Levu, Viti Is.; arboreal (Garrett). 



Distinguished from P. gracilis chiefly by the somewhat larger 

 aperture, the last whorl being larger and rather more inflated, the 

 outer lip consequently more evenly arched ; these differences being 

 correlated with geographic isolation. Kobelt's var. minor of P. 

 rugatus has no differential characters, being merely a moderately 

 small shell, alt. 40.5 mill. 



Var. CRASSILABRUM (Garrett). PI. 42, fig. 91, 92. 



Similar to var. rugatus in the short spire and fine corrugation, but 

 more solid, the peristome is strongly recurved and heavily thickened ; 

 columellar fold stronger. 



Alt. 43, diam. 22^ ; longest axis of aperture, including peristome, 



30 mill. 



Alt. 41, diam. 20^ ; longest axis of aperture, including peristome, 



28 mill. 



Vanua Levu, in the interior, at about the middle of the island ; 

 arboreal. 



Some shells are almost wholly denuded of the thin cuticle, expos- 

 ing the white or slightly pink-tinted substance of the shell ; the spire 

 is buffer flesh-tinted. 



The types of rugatus and crassilabrum are in the collection of the 

 Academy. 



P. MALLEATUS (Jay). PI. 41, figs. 75, 76, 77. 



Shell compressed-umbilicate, oblong-ovate, rather thin ; white, with 

 brown or olive-brown irregular blotches, often arranged in longitudinal 

 stripes, sometimes triangular or zigzag, smaller spots being scattered 



