126 CALLISTOPLEPA. 



pressed suture. Last whorl inflated, tapering below, longer 

 than the spire. Columella slightly inturned, straight or mod- 

 erately arcuate, obliquely truncate. 



The foot is long and tapering, with a triangular flattening 

 above with serrate-crested margins. Mantle streaked and 

 maculate with black and brown, showing through the shell. 



The radula has nearly straight transverse rows, the cen- 

 tral teeth are about as large as the laterals; centrals and 

 laterals unicuspid, marginal teeth with small ento- and ecto- 

 cones developed. 



Eggs elliptical, small, oval, with a chalky-white granulate 

 calcareous shell. 



Type Ackatina shuttleworthi Pfr. Distribution, West 

 Africa : Grand Bassam to Karnerun, and in the Congo Valley. 



The summit of the shell is rather mamillate, the nucleus 

 smooth, following embryonic whorls with the sculpture of the 

 rest of the shell. The paper-like tenuity of the shell, its 

 peculiar gelatinous luster, the thread-like vertical sculpture 

 and the system of coloration, all separate this group from 

 Achatina. The narrow foot is a further distinguishing 

 character, but the radula shows a much greater differentia- 

 tion: the central tooth is wide, as in Helicidce, in striking 

 contrast to almost the entire series of Achatinoid genera, in 

 which as a rule it is very much reduced in size. 



The eggs are white, not yellow as in Achatina and its near 

 relatives. An individual of C. barriana opened by d'Ailly 

 contained 14 eggs measuring 6y 2 to 7 mm. 



This genus was proposed by Ancey in 1888 with only a 

 brief definition. It was independently recognized and placed 

 upon a firm basis, in 1896, by Adolf d'Ailly, to whom we 

 owe our knowledge of its generic characters. 



The name Callistopepla, "most beautiful garment," was 

 misspelled in Ancey 's original note, Callistoplepa; but un- 

 fortunately another name was proposed before it appeared 

 in the amended form. It is impossible to truthfully quote 

 Callistopepla earlier than 1898; and I am therefore com- 

 pelled to adopt the name as originally spelled. An author 

 who proposes new genera in foot-notes, misspells the names 



