ACHATINA, WEST AFRICA. 7 



bb. Rather solid or thin, wrinkled and very 

 densely and finely striate spirally; green or 

 brown, with or without broad, indistinctly 

 defined streaks; 110-130 mm. long. 



rugosa, no. 28. 



bbb. Thin; evenly granulate throughout; fulvous 

 with wide obscure streaks ; 128 x 56, apert. 

 72 mm. iostoma, no. 30. 



bbbb. Rather solid, finely granulose-striate ; olive- 

 yellow, bedaubed with reddish-chestnut 

 blotches ; 75 x 29, apert. 35 mm. 



allisa, no. 32. 



aa. Shell smooth or nearly so below the middle of the 

 last whorl. 



b. Shell whitish under a yellow cuticle, with 

 bent or zigzag flames or stripes, rarely plain. 

 c. Columella and parietal wall rose-red. 



d. Very large, 170 x 95 mm., with zig- 

 zag flames. achatina, no. 1. 

 dd. Plain olive-yellow; 96-120 mm. 



monochromatica, no. la. 



ddd. With indistinct fulvous streaks or 



nearly plain; 95 x 53 mm. or 



smaller. oblitterata, no. 5. 



cc. Columella and parietal wall white or 



bluish. 



d. With bold, broad, black-brown zig- 

 zag stripes. 



e. 148x65, apert. 69 mm. 



buchneri, no. 2. 

 ee. 93 x 50, apert. 47 mm. 



weynsii. no. 3. 

 eee. Length 80, apert. 38 mm. 



tincta, no. 4. 



dd. Shell rather thin, with numerous 

 rather narrow stripes. 



e. Fulvous, with close, narrow- 

 waved stripes ; 87 x 28 mm. 



perfecta, no. 8. 



