ATJRicuLrD^;. 83 



§ 1. Aberrant species, with the basal keel indistinct. 



1. CaSSIDULA GltLTNTERI. 



Shell subperforate, ovate-oblong, rather solid, blackish-brown, 

 often eroded, minutely striated longitudinally, decussated by 

 close-set spiral grooves, which are deeper and more distant near 

 the suture ; spire convexly conoidal, blunt ; suture linear ; 

 whorls nearly live, moderately convex, the last forming two- 

 thirds of the total length, ovate, slightly attenuated and in- 

 distinctly tuberculated at base ; aperture scarcely oblique, semi- 

 ovate ; parietal plait single, compressed, rather transverse ; 

 columellar plait a little smaller, parallel to the parietal one ; 

 peristome simple ; right margin slightly contracted anteriorly, 

 scarcely refiexed, bearing within a single tooth a little above 

 the middle ; columellar margin dilated, thin, slightly spreading. 

 Length 7, breadth U mill. 



Cassidula Gruneri, Pfr. in Malak. Bl. 1854, p. Ill ; Si/n. Auric. 

 n. 109 ; Mon. Anne. p. 109. 



H. and A. Adams, Gen. rec. Moll. ii. p. 238. 

 Hab. Borneo (Gruner). 



2. Cassidula doliolttxi. 



Shell subrimate, oblong-ovate, rather solid, sculptured with 

 regular spiral grooves, and punctiformly decussated with irre- 

 gular longitudinal strias, not shining, brownish or whitish-grey, 

 with pale bands ; spire convexly conoidal, slightly mucronate ; 

 suture impressed ; whorls seven, scarcely convex, the last form- 

 ing two-thirds of the total length, indistinctly angled above, 

 gradually attenuated towards the rounded base ; aperture nearly 

 perpendicular, narrowly semiovate ; parietal plait single, com- 

 pressed, entering horizontally, and sometimes an indistinct small 

 tubercle above it; columellar plait similar, a little smaller; 

 peristome simple ; right margin very little refiexed, bearing 

 within three teeth, the middle of which is stronger and the 

 lowest indistinct. Length 10, breadth mill. 



Auricula doliolum, Petit in Proc. Zonl. Soc. 1842, p. 201. 

 Cassidula doliolum, II. and A. Adams in Proc. Zool. Soc. 1854, 

 p. 31 ; Gen. rec Moll. ii. p. 238. 



Pfr. Syn. Auric, n. 110; Man. Auric, p. 109. 



/3. Larger, more slender and lengthened. Length 13, breadtli 

 7 mill. 

 Hab. Sinait, Isle of Luzon (II. Cuming) ; the var. /3. Sydney, 



Australia. 



