102 COCHLOSTYLA-CHLOR^EA. 



(3) GROUP OF C. PARADOX^.. 



Body-whorl obtusely or not obviously keeled, its latter half some- 

 what laterally compressed or flattened at the periphery ; descending 

 toward the aperture ; lip broad. 



Closely allied to the group of C. thersites, but with the last whorl 

 not acutely keeled, less distorted, and descending in front. 



1. Basal lip with a central strong tooth-like callus within; apical 

 and columellar spots dark; no bands. C. parodoxa. 



2. Basal lip broad and straightened, without a central tooth ; apex 

 and columella white; body-whorl 2-banded. C. constricta. 



3. Basal lip arcuate, narrower ; no color bands or spots. 



C. undina. 



C. PARADOXA Pfeiffer. PI. 22, figs. 12, 13, 14. 



Imperforate, globose-depressed, solid, not obviously carinated; 

 light yellow with a faint tinge of green, the apex blue-black, a large 

 spot at the insertion of the columella and a small one at the upper end 

 of the lip, dark brown; having a callous thickening at the middle 

 of the baso-columellar lip. 



Spire rather elevated, apex obtuse ; whorls 5, the last somewhat 

 deflexed in front, obtusely carinated just above the upper insertion 

 of the lip, having a broad shallow constriction just behind the lip. 

 Surface lightly obliquely striated, and showing under a lens 

 excessively tine, close spiral striae. Aperture very oblique ; lip 

 broadly re flexed, white; baso-columellar margin adnate, thickened 

 within, and having a broad tooth or callus in the middle. 



Alt. 13*, diam. 23 mill. 



Province of Albay, Luzon, Philippines. 



H. paradoxa PFR., P. Z. S. 1845, p. 39; Monogr. i, p. 267; 

 Conchyl. Cab., t. 71, f. 1, 2. REEVE, Conch. Icon., f. 1419 

 PHILIPPI, Abbild. u. Beschreib. i, p. 153, t. 4, f. 7. 



Distinguished from C. constricta by the absence of brown bands, 

 the whorl less deflexed toward the aperture, and the more prominent 

 callus or wide tooth in the middle of the baso-columellar lip. The 

 lip is more broadly reflexed than in C. undina, and the columella 

 straighter, more thickened within. 



Form immaculata, (pi. 21, figs. 27, 28). Whitish, without dark 

 spots at apex and columella, the aperture yellow within. 



