88 aukicl'lid^. 



11. Cassidula tiirgida. 



Shell shortly rimate, ovate, somewhat fusiform, ventricose, 

 solid, slightly shining, brownish, striate and sculptured with 

 rather crowded spiral furrows and punctured lines, which are 

 deeper near the suture ; spire convexly conoidal, slightly mucro- 

 nate ; suture impressed ; whorls seven to eight, convex, the last 

 forming three-fifths of the total length, inflated above; basal 

 keel strong, surrounding a broad umbilical region ; aperture rather 

 oblique, oblong, narrow at base ; parietal teeth two, the upper 

 oblique, the other larger, tongue-shaped, nearly horizontal; 

 columellar plait strong, thick, ascending obliquely, produced 

 exteriorly to the margin, slightly sulcate ; peristome expanded, 

 bordered with a pale streak ; right margin bearing above the 

 middle a broad white, acutely dentiform callus, which spreads 

 rectangularly, and is continued to the columellar plait ; colu- 

 mellar margin callous, appressed. Length 14, greatest breadth 

 9 mill. 



Cassidida turgida, Pfr. in Malak. Bl. 1854, p. 154 ; Syn. Auric. 

 n. 117 ; Novit. Conch, i. p. 48. n. 83. 1. 12. f. 19, 20; Mon. Au- 

 ric, p. 115. 



H. and A. Adams, Gen. rec. Moll. ii. p. 239. 



Hob. Isle of Negros, Philippines. 



12. CaSSITjULA nucleus. 



Shell subrimate, ovate-conoidal, cassidiform, solid, very mi- 

 nutely striated longitudinally and spirally, slightly shining, dark 

 chestnut-coloured ; spire conoidal, with rather convex outlines 

 and the apex rather pointed; suture slight; whorls eight, 

 scarcely convex, the last forming two-thirds of the total length, 

 inflated above, sometimes with a white band, attenuated at 

 base ; basal keel elevated, surrounding a broad periomphalum ; 

 aperture nearly perpendicular, narrow, contracted above the 

 middle, rounded in front ; parietal plaits two, compressed, the 

 upper small, almost vertical, the other entering obliquely ; colu- 

 mellar plait strong, rather duplicate exteriorly ; peristome thick- 

 ened ; right margin inflated externally, bearing within, above 

 its middle, a strong, sharp tooth, which is longitudinally con- 

 tinued to the base ; columellar margin dilated, sinuate, spread- 

 ing. Length 21, greatest breadth 13 mill. 

 Limax nucleus, Martyn, Univ. Conch, ii. pi. 67. fig. ext. ; ed. 



Clien. pi. 24. f. 2. 

 Helix nucleus, Gmel, Syst. p. 3651. n. 255. 

 Auricula nucleus, Ferassac, Prodr. p. 105. n. 26. 



Desh. in Enc. Mcth. ii. p. 92. n. 13, et in Lam. Hist. viii. 

 p. 335. n. 21. 



