182 COCHLOSTYLA-HELICOSTYLA. 



H. mirabilis FER., Prodr. 320 ; Histoire, t. 31, f. 4-6. Sows., P. 

 Z. S. 1841, p. 2. PFR., Conchyl. Cab., p. 288, t. 48, f. 5, 7, 9, 10 ; 

 Monogr. i, p. 220. RVE., Conch. Icon., f. 45. H. formosa WOOD, 

 Index, Suppl., t. 7, f. 10. H. galactites Lam., An. s. Vert, iv, p. 69. 

 H. persimilis DH. in Fer. Hist., p. 120, t. HOB, f. 2. Cochlostyla 

 mirabilis SEMPER, Reis., p. 192. HIDALGO, Obras, t. 49, f. 1-7. 



A globose shell, generally a little higher than broad, and 

 excessively variable in both contour and pattern of coloring. The 

 surface is often somewhat malleated. The ground-color varies from 

 a very light buff to a yellowish-brown. It is allied to C. fulgens, 

 differing mainly in the pattern of coloring. 



Slight traces of whitish hydrophanous cuticle are observable near 

 the suture in some specimens. 



Tbe principal varieties of banding are these : 



(1.) Unicolored yellow ; the earlier whorls white or having a 

 purple supra-sutural band (fig.85). The earlier whorls are some- 

 times pink. 



(2.) Yellow or buff, with a narrow sutural brown line, a sub- 

 peripheral brown band, and a columellar patch. There are some- 

 times numerous yellow lines also (fig. 79.) 



(3.) Yellow or yellowish-brown, with 4 wide or narrow bands, 

 one columellar, another sutural, with two intermediate. This is the 

 commonest pattern (figs. 81, 86.) 



(4.) Yellow with reddish bands, Marinduque, (fig. 80.) 



(5.) Entire shell very dark (fig. 84.) 

 Transition forms to var. fulgens. 



Form triehroa (pi. 31, fig. 38). Having 4 wide or narrow black- 

 ish-brown bands, and three yellowish-brown bands in their intervals. 

 The specimen figured is from Albay, Philippines. The figure on 

 pi. 31 is united by error with that of C. tephrodes, below it. 



Another deviation has the three brown or yellowish-brown bands, 

 but no blackish bands (pi. 57, fig. 87). 



A very large series of these transition forms is before me. 



VAR. FULGENS Sowerby. PL 38, figs. 79, 80, 81. 



Imperforate, globose or globose-turbinate, solid ; ground-color 

 white above the periphery, yellowish-brown below it, having normally 

 4 blackish-brown bands, one at suture, one at columella, the other 

 two encircling the body-whorl at equal distances ; the sutural band 

 often absent, and sometimes additional bands are developed on^base 



