COCHLOSTYLA-HELICOSTYLA. 171 



Var. LUTEOCINCTA Semper. PI. 56, figs. 66, 67. 



Pure white in color; more globular; not malleated. (&) 



Casiguran, N. E. Luzon. 



C. LIVIDOCINCTA Semper. PI. 56, figs. 71, 72. 



Imperforate, globose, thin, ornamented with a broad livid band, 

 and another of brown at the suture ; spire scarcely exserted, apex 

 obtuse, bluish, ornamented with a white cuticular band. Whorls 4- 

 4t, nearly flat, the last much inflated, not descending; coluinella 

 subvertical, excavated, white. Aperture little oblique, lunar ; per- 

 istome simple, scarcely thickened, not reflexed. 



Alt. 27, greater diam. 32, lesser 26 mill. (&) 



Casiguran, Baler, Mariquit, island of Luzon, very rare. 



C. liyido-dnctaS., Reis. Phil. Landmoll., p. 182, t. 9, f. 9. 



Of this remarkable species I have found in all, only two adult 

 and two young specimens. ($.) 



C. PUDIBUNDA Semper. 



Subperforate, conic-globose, thick, white; spire exserted, apex 

 obtuse, red or reddish -golden. Whorls 5, a little convex, the last 

 inflated, not descending. Columella lightly arcuate, vertical, white. 

 Aperture little oblique, rounded-lunar ; peristome slightly thickened, 

 not reflexed. Alt. 31, greater diam. 35, lesser 28 mill. 



Minanga, Ambubuk and Digollorin, Luzon. 



C. pudibunda SEMPER, 1. c., p. 183. 



Agrees entirely with typical Cochlostyla in anatomy. This species 

 has not been figured. 



Section VII. HELICOSTYLA Ferussac, 1819. 



As used here, this section comprises a number of minor groups, 

 too closely allied to be given separate rank as primary sections. 



The shells have generally a more elevated contour than those in- 

 cluded in Calocochlea, and usually they lack hydrophauous cuticle 

 and spiral strise. 



It must freely be admitted that the differences between this group 

 and Calocochlea are not definite enough to permit one to frame 

 diagnoses of any practical value. In the arrangement of the spe- 

 cies no two authors agree in detail, thi? diversity of opinion being 

 the natural result of the indiscriminate inosculation of characters 

 shown by the shells themselves. 



