158 PSEUDOGLESSULA. 



Akad. Wissensch. 1876, p. 260, pi. 3, f. 5, 6.Pseudoglessula 

 c., BTTG., Nachrbl. d. d. Malak. Ges. 1892, p. 202.Homorus 

 (Ps.) c., KOBELT, C. Cab. p. 93, pi. 22, f. 3, 4 (1894). 



Gray's original description, given above, is without dimen- 

 sions. Pfeiffer in the second volume of the Monographia 

 has described a specimen in the British Museum as 28 mm. 

 long, 13 wide. This is presumably one of Gray's types, since 

 he mentions the species as in the "collection of the British 

 Museum, Mrs. Manger's and my own." The types were 

 from Sierra Leone, a country somewhat distant from Old 

 Calabar and Cameroons, where the species (under the name 

 calabarica), is common. 



Var. grayi d'Ailly (pi. 61, fig. 10). Reeve in the Con- 

 chologia Iconica figures a much more slender shell from 

 Cuming's collection under the name A. clavata. It is evi- 

 dently this which d'Ailly desires to call P. clavata var. grayi. 

 It will probably be found to be specially distinct from clavata. 



Adolf d 'Ailly has discussed the literature and characters of 

 this species at length, having at his disposal some 54 speci- 

 mens. The largest measure length 45, diam. 17 mm., with 

 10 whorls (fig. 12). Eleven specimens from a dark and 

 humid forest at Bonge are 24 mm. long, only 8 wide, with 

 9!/2 whorls, corresponding perfectly with Reeve's figure of 

 clavata. Between these extreme forms there are transitions, 

 so that he concludes that in this case the contour of the 

 shell is a character of but small importance, and therefore 

 no specific distinction can be made between clavata and cala- 

 barica. The difference of color noted in the original des- 

 criptions is due to the partially bleached condition of the 

 type of clavata. The original description of calabarica 

 follows : 



Achatina calabarica Pfr. (pi. 61, fig. 11). Shell oblong- 

 turrited, rather thin, closely striate, glossy; blackish-brown 

 sometimes streaked with paler. Spire subconcavely produced, 

 the vertex minute. Whorls 9, moderately convex, the upper 

 ones ribbed, the last whorl one- third the total length, thread- 

 carinate in the middle. Columella arcuate, obliquely trun- 

 cate at the base of the subvertical rhombic-elliptical aper- 



