ARCHACHATINA. 107 



aaa. Shell thin or fragile, usually boldly marked; aper- 

 ture white, lilac or bluish within, the flames showing 

 through. 

 b. Columella red or purple. 



c. Fulvous obsoletely marbled with chest- 

 nut ; 66 x 30 mm. Columella with a 

 purple line; whorls 5%. 



papyracea, no. 11. 



cc. Yellowish- green, with wide, deep chestnut 



stripes, narrow above and few reaching 



the suture, early whorls roseate; colu- 



mella short, narrow, quite concave and 



crimson; 68x35 mm. adelince, no. lla. 



ccc. Yellow with vivid dark brown stripes; 



col. slightly arcuate, purple ; 66 x 30 mm., 



whorls 6%. bayoU, no. 12. 



bb. Columella whitish. 



c. Olive-yellow, profusely zigzag-streaked 

 and dotted with chestnut; densely, finely 

 and distinctly granulose; 48x27 to 55x32 

 mm., whorls 5. siderata, no. 10. 



cc. Greenish-yellow, with chestnut flames, 

 wider, confluent and blackish at base; a 

 tessellate border below suture; early 

 whorls rose ; 72 x 39 to 41 mm. 



knorri, no. 13. 



ccc. Last whorl granulose-decussate through- 

 out; 80 x 40 to 90 x 50 mm., whorls 6. 



camerunensis, no. 14. 



Group of A. bicarinata. 



The large, solid shell is rudely striate, sinistral, bluish-white 

 inside, with the columella very obliquely truncate or strongly 

 sinuous. 



1. A. BICARINATA (Bruguiere). PI. 46, fig. 1; pi. 19, fig. 27. 

 Shell sinistral, ovate-fusiform, obtusely angular at the peri- 

 phery and a short distance below the suture ; solid and strong, 



