AMPHIDROMUS, DRAPARNAUDIA. 283 



peristome white, thick, expanded and slightly reflexed, margins con- 

 nected by a transparent raised callus, columellar portion triangularly 

 dilated above, somewhat angular below ; aperture sub-ovate, whitish 

 within. Alt. (sinistral specimen) 48 ; maj. diam. 26 mill. Alt. 

 (dextral specimen) 50; maj. diam. 27 mill. (Fulton). 



Perak (Grubauer) 



Amphidromus perakensis FULTON, Journ. of Malacology, viii, p. 

 104, pi. 9, f. 8-10 (Dec. 30, 1901). 



" At first sight one could easily take this species to be one of the 

 numerous varieties of A. perversus, but on holding the shell obliquely, 

 the very characteristic projection becomes conspicuous. This plate 

 appears, from an exterior view, to be thick, but on breaking away 

 the wall of the shell, it is seen to be quite thin. All the numerous 

 specimens collected are X[uite constant in the possession of this 

 peculiarity, although it is more prominent in some than in others.'* 

 (Fulton.) 



This is evidently allied to A. aureus leucoxanthus. I have de- 

 scribed and figured a form having a columellar lobe, Man. Conch., 

 xiii, p. 164, pi. 54, figs. 76, 77. 



ERRATA. 



On pages 13 and 18 I placed Bulimus sinistrorsus Moss & Webb 

 under Draparnaudia lifuana. Having examined specimens received 

 from Mr. Moss I find that the form was correctly identified. It is a 

 new variety of D. sinistrorsa (Dh.), separable by its less depressed 

 last whorl and less oblique aperture, which is produced basally more 

 than in sinistrorsa, and less tangentially ; somewhat as in D. crossei. 

 The Helix (Geotrochus) sinistrorsa Melv. & Stand, (p. 18), is also to 

 be deleted from the synonymy of D. lifuana, as it was apparently 

 based upon specimens of the same lot. 



