186 COCHLOSTYLA-HELICOSTYLA. 



This shell has the greatest resemblance to C. collodes of the island 

 Zebu, differing only in being a little more depressed than any spec- 

 imens I have seen of that species. Under the yellow cuticle it i& 

 white. 



I do not know the location of the island Tukan Bessi. 



(3). Group of C. metaformis. 

 C. METAFORMIS Ferussac. PI. 36, figs. 25, 26, 27, 28, 29. 



Imperforate, solid, oblong-ovate, elevated, smooth, varying from 

 buff to chestnut-yellow, unicolored or having dark chestnut bands 

 at suture, periphery and columella, and frequently another on the 

 base, any or all bands often absent, but the columellar band most 

 cpnstant. Generally covered with a hydrophanous buff-white cuticle 

 worn into oblique shreds. 



Spire elevated, the apex very obtuse. Whorls 6, the last descend- 

 ing in front. Aperture oval, oblique, white inside ; lip white, nar- 

 row, slightly expanded, thickened ; columella vertical, white, spread- 

 ing in a shining white callus; slightly arcuate above, more or less 

 strongly toothed below. 



Alt. 43, diam. 31 mill, (average specimen.) 



Alt. 54, diam. 33 mill, (large specimen.) 



Alt. 32, diam. 25 mill, (small specimen.) 



Bohol; middle Luzon. 



H. metaformis FEE., Hist. t. 108, f. 2 PFR. in Conchyl. Cab. p. 

 289, t. 49, f. 1-5; Monogr. i, p. 222. REEVE, f. 7Q. CocMostyla 

 metaformis SEMP., Reis. p. 192, t. 13, f. 16; t. 18, f. 21 (anatomy). 

 HIDALGO, Journ. de Conchyl. 1887, p. 149. Bulimus metaformis 

 GRAY, et al. Helix ovularis MKE., Catal. Malsb. p. 4. 



An oblong species, allied to C. rustica and especially C. hydrophana, 

 the latter being scarcely more than a variety. The principal varia- 

 tions in contour and banding are shown on my plate. 



There is an uncommon form having a chestnut rather than yellow 

 ground-color, and a brown lip. A large specimen of this is shown 

 in fig. 25. 



I am inclined to consider the 0. rustica of Hidalgo (not Mous- 

 son) as a color variety of this species. See pi. 58, fig. 89. Several 

 shells corresponding to this figure are before me. 



A form very closely allied to the true C. rustica is figured on pi. 

 58, fig. 90. 



Another notable color-form is illustrated on pi. 58, fig. 88. 



