COCHLOSTYLA-HELICOBULINUS. 195 



Ptychostylus ; through certain depressed forms of C. turgens it ap- 

 proaches C. harfordii and other allied species of Calocochlea ; and 

 on the other hand, it is difficult to so diagnose Helicobulinus that 

 all species of Orthostylus will be excluded. 



The several species of Helicobulinus are, however, more nearly 

 related to each other than the various forms are to any of these 

 diverse groups, so that despite several atttempts by various authors 

 to dismember the section, it is likely to maintain its integrity 

 permanently. 



C. GRANDIS Pfeiffer. PL 59, figs. 7, 8 ; pi. 60, figs. 9, 10, 11 ; pi. 

 48, figs. 66, 67, 68. 



Imperforate, large, trochoidal or turbinate, solid, dark reddish- 

 chestnut, covered with a cream colored hydrophanous cuticle which 

 is cut by dark, narrow spiral bands, and is largely lost through 

 erosion on the earlier whorls and the apertural part of the base. 



The spire is elevated, conical ; apex rather obtuse, whitish. Whorls 

 5J-6J, the last obtusely angular at periphery, somewhat concave or 

 flattened below the angle. Aperture oblique, white or blue inside ; 

 penstome narrowly reflexed, purple-brown ; columella very short, 

 deeply entering, and having a strong fold near the insertion. 



Alt. 50, diam. 60 mill. 



Alt. 43, diam. 60 mill. 



Northern Luzon, at Baler, Palanan, Digollorin, Casiguran and 

 Camiguin de Luzon. 



H. grandis PFR., P. Z. S. 1845, p. 43. EEEVE, Conch. Icon. t. 7, 

 f. 30. Cochlostyla grandis DOHRN, Mai. Bl. ix, p. 211, 1862. 

 SEMPER, Reis. Landm. p. 199. H. collosea PFR., Zeitschr. f. Mai. 

 1852, p. 153 ; Conchyl. Cab. p. 422, t. 149, f. 1, 2. IT. carolus DH., 

 Journ. de Conchyl. 1861, p. 348, t. 16, f. 1, 2. Cochlostyla carolus 

 HIDALGO, Journ. de Conchyl. 1887, p. 138. 



This magnificent species may be known at once by its very short 

 columella. It varies greatly in contour, the height of the spire and 

 the number of whorls being unusually mutable. Semper is disposed 

 to include " Bulimus " lignarius Pfr. with grandis, but the material 

 before me, of both species, causes me to believe them entirely 

 distinct. 



C. SARCINOSA Ferussac. PI. 47, fig. 58. 



Imperforate, capacious, globose-turbiuate. Green, becoming fawn- 

 tinted on the spire, encircled at the periphery by a chestnut band, 



