84 AUBICULIDJa. 



§i 2. Typical Cassidulcs : basal keel distinct. 



3. CASSIDULA ZONATA. B.M. 



Shell imperforate, ovate-conoidal, chestnut-coloured, with 

 three pale bauds, slightly striated and sculptured with distant 

 punctured spiral striae, one of which near the suture is deeper 

 than the others ; spire conoidal, rather pointed ; whorls seven, 

 almost flat, the last forming three-fifths of the total length, 

 somewhat inflated above, attenuated at base ; aperture scarcely 

 oblique, sinuately oblong ; parietal plaits two, the upper minute, 

 punctiform, the other compressed, nearly horizontal, continued 

 externally into the keel, which surrounds the umbilical region , 

 columellar plait compressed, rather converging towards the other, 

 produced externally to the margin; peristome dilated; right 

 margin thickened externally into a crest, bearing within, in the 

 middle, a single tooth ; columellar margin, reflexed, affixed. 

 Length 8|, breadth 5 mill. 



Cassidula zonata, H. and A. Adams inProc. Zool. Soc. 1854, p. 32 ; 

 Gen. rec. Moll ii. p. 239. 

 Pfr. Syn. Auric, n. Ill ; Mon. Auric, p. 110. 



Hab. Sydney, Australia. 



4. Cassidtila faba. 



Shell imperforate, ovate, solid, sculptured, imder a lens, with 

 crowded spiral ridges and still more crowded longitudinal strife, 

 covered with a dirty fulvous, opaque periostraca ; spire semi- 

 globose ; whorls 6-7, moderately convex, the first one forming 

 a minute, rather eroded, mucronate apex, the others contracted 

 near the linear suture, the last equalling two-thirds of the total 

 length, scarcely attenuated at base, provided with a slight keel, 

 which surrounds the middle-sized umbilical region; aperture 

 rather oblique, sinuately semiovate, whitish within ; parietal 

 plaits two, the upper small, nodiform, the other compressed, 

 transverse, placed below the middle; columellar plait tooth- 

 shaped, obliquely produced to the margin ; peristome white ex- 

 ternally ; right margin sinuate above, bearing near the middle a 

 single tooth, which is elongated into a crest towards the base ; 

 columellar margin affixed. Length 11, greatest breadth 7 mill. 



Auricula (Cassidula) faba, Menke in Zeitschr. f. Malak. 1853, 



p. 124. 

 Cassidula faba, Pfr. Syn. Auric, n. 112; Novtt, Conch, i. p. 5. 



n. 7. t. 2. f. 7-9 ; Mon. Auric, p. 111. 



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



Hab. Java (Heusinyer). 



