194 CLAVATOR. 



cc. With pale bands at suture and periphery. 



C. watersi, no. 3, 



&&. Spire convexly-conic above; suture distinctly 

 margined; size large. C. eximius, no. 9. 



aa. Diameter of shell exceeding one-third its length. 

 &. Large species, 80-150 mm. long; spire convexly 

 conic above, suture with a distinct, narrow mar- 

 gin ; later whorls weakly decussate. 



C. eximius, no. 9. 



&&. Smaller, 50-70 mm. long; spire more straightly 

 conic. 



c. Diam. about half the length of the shell; 

 spire straightly tapering. C. heimburgi, no. 8. 

 cc. Diam. decidedly less than half the length; 

 spire thicker. 

 d. 66 x 24 mm. ; whorls 8 to 9. 



C. clavator, no. 6. 

 dd. 53 x 21 mm. ; whorls 7. 



C. johnsoni, no. 7. 



Group of G. obtusatus. 



Shell conspicuously striped with chestnut on a yellow 

 ground, the later whorls not spirally striate; columellar lip 

 built forward above the umbilical fissure. 



1. C. GRANDIDIERI (Crosse et Fischer). PI. 49. fig. 29. 



Shell subrimate, oblong, rather thin, longitudinally im- 

 pressed with rather widely spaced striae, not decussate. Spire 

 long-pyramidal, the apex rather obtuse; suture crenulate- 

 margined. Whorls 8, rather flat, the last slightly ascending, 

 nearly half the total length. Aperture oblong-pirif orm ; 

 columella vertical, straight, receding. Peristome simple, the 

 margins distant, somewhat converging, columellar margin 

 very much dilated, very broadly reflexed over and closing 

 the umbilical chink and reaching a width of as much as 10 

 mm. in the widest part. Basal and outer margins reflexed, 

 somewhat thickened outside. Length 95, diam. 31, aperture 

 37 mm. long, 23 wide (C.et F.). 



