PSEUDOGLESSULA. 157 



Great Lake region the columellar truncation is subobsolete; 

 and some additional forms now classed as Buliminus may be 

 found to belong to Pseudoglessula. 



It is to be regretted that d ' Ailly, who had an abundance of 

 alcoholic specimens, did not describe the anatomy. Von 

 Martens' figure of the teeth of Ps. leroyi does not show the 

 marginal teeth intelligibly but the central and lateral teeth 

 are Achatinoid, and differ from those of Homorus in wanting 

 an inner cusp on the lateral tooth. Dupuis' observations 

 on the external features of P. humicola, are given under that 

 species (sp. no. 8). The flat, bifid tail and bordered foot 

 (pi. 62, fig. 26) are remarkable features; but that species 

 may not be a true Pseudoglessula. 



In P. retifera the pale whitish yellow eggs measure 

 4x2% mm.; in P. sjostedti they are pure white, mat, 

 5x3 mm. 



West African Species. 



Embryonic whorls vertically ribbed, species 1 to 9. 

 Embryonic whorls reticulate-pitted, species 10 to 12. 



1. P. CLAVATA (Gray). PI. 61, figs. 11, 12. 



Shell lanceolate, thin, pellucid, white; whorls 11 or 12, 



rather convex, closely concentrically grooved; last with a 



spiral, slightly-raised keel, and smooth in front; the apex 



club-shaped, with more distant, sharp and elevated ridges 



. (Gray). 



West Africa: Sierra Leone (Mr. Speck, type loc. of 

 clavata) ; Old Calabar (Cuming coll., type loc. of A. cala- 

 barica) ; Kamerun at Etome, Bomana, N'dian, Bonge, Isowi, 

 Buea, Bibundi, Bonjongo (Buchholz, Sjostedt, and others). 



Acatina clavata GRAY, The Magazine of Natural History 

 etc., conducted by Edward Charlesworth F. G. S., i, new ser., 

 p. 487 (Sept, 1837). PFR., Monogr. Hel. Viv: ii, p. 260; iii, 

 498; iv, 609; vi, 230. REEVE, C. Icon, v, pi. 16, f. 72. 

 Pseudoglessula clavata d 'AILLY, Bihang, p. 100, f.1-4. 

 Achatina calabarica PFR., Proc. Zool. Soc. 1865, p. 832; 

 Monogr. vi. p. 229. Stcnogyra c., MARTENS, Monatsbr. K. P. 



