BY HENRY SUTER. 495 



Charopa pseudocoma, n.sp. 

 (PI. XXIII. figs. 9-9e.) 



Shell discoidal, umlnlicated, fuscous with a greenish hue, some- 

 times with distant, irregular, radiate brown streaks, which extend 

 in zigzag lines to the umbilicus, sometimes without distinct 

 marks ; not shining, thin, semi-transpareut, with oblique slightly 

 curved close ribs, slightly directed backwards, about 5 per millm.; 

 the interstices between the ribs occupied by fine growth-lines. 

 Spire flat, periphery rounded, apex smooth, mostly devoid of 

 epidermis and somewhat eroded. Whorls 5, rather flattened, 

 especially the four first ones, slowly and regularly increasing, the 

 last not descending anteriorly ; suture not deep. Aperture 

 diagonal, lunately-rotund ; peristome simple, straight, acute, 

 margins slightly convergent ; columellar margin arched, slightly 

 dilated above towards the umbilicus, which is broad, conicnl, 

 showing all the volutions and occupying over four-tenths of the 

 diameter ; base rounded. 



Diam., greatest 5J, least 5 ; height 2 J millm. 



Hah. — South Island : Akaroa, Port Hills (Lyttelton), Dyer's 

 Pass, Riccarton Bush, near Chiistchurch (H. S.) In these places 

 it seems to replace Ch. coma, Gray. 



Note. — This species, which is very near Ch. coma, is distinguished 

 from it by its smaller size, the darker colour and its greenish hue, 

 the very frequent absence of any markings, and, if present, their 

 zigzag form on the base. The ribs are closer and finer, the spire 

 always flat, and the umbilicus broader. It is much more constant 

 in form than Ch. coma. 



Animal very shy, small, yellowish-white. Eye-peduncles rather 

 large, clavate, blackish, from each of them a black stripe runs 

 along the neck to the mantle. Tentacles short, rather stout, 

 rounded in front. The neck is transversely grooved. The whole 

 length of the foot is bordered by a distinct pedal line, and to it 

 run over the entire length of the body diagonal grooves. Mantle 

 rather posterior ; tail short, rounded, tapering, without mucous 

 pore, not extending beyond the shell. Sole uniformly coloured, 

 whitish and smooth. 



