axjeiculid^e. 85 



5. Cassidtjxa Sowebbyana. 



Shell _ subriinate, oblong, solid, slightly striated, and sculp- 

 tured with crowded spiral grooves, rather shining, dark chestnut- 

 coloured; spire convexly conoidal, blunt, for the most part 

 eroded; suture impressed, bordered with white; whorls five, 

 the upper ones moderately convex, the last forming about three- 

 fifths of the total length, thick, callous and constricted ante- 

 riorly, shortly keeled at base ; aperture scarcely oblique, sinu- 

 ately semiovate ; body of the penultimate whorl bearing above 

 a small tubercle, and below the middle a rather obliquelv enter- 

 ing plait ; columella! plait strong, nearly triangular ; peristome 

 lipped, with the margins imited by a yellowish deposit ; right 

 margin furnished within, above the middle, with a decurrent 

 tooth; columella!- margin slightly reflexed. Length 13^, breadth 

 7fmill. 



Auricula (Cassidula) Sowerbyana, Pfr. in Zeitschr. f. Malak. 



1853, p. 125. 

 Cassidula decussata, H. and A. Adams in Proc. Zool. Soc. 1854, 



p. 32. n. 13 ? 

 Cassidula Sowerbyana, Pfr. Syn. Auric, n. 113 ; Mm. Auric, p.lll. 

 H. and A. Adams in Proc. Zool. Soc. 1854, p. 32. n 10 : 

 Gen, rec. Moll ii. p. 238. 

 Hah. Singapore ; and Moreton Bay, Australia. 



6. Cassidula Bensoni. 



Shell imperforate, ovate, turgid, solid, sculptured with slightly 

 wrinkled longitudinal stria?, distant scarcely elevated ridges and 

 more crowded spiral strife, dark brown ; spire short, conoidal, 

 with convex outlines ; _ suture slightly canaliculate ; whorls 

 eight, rather flat, marginated, below the suture, by a deeper 

 furrow; last whorl forming two-thirds of the total length, 

 slightly angulated above, attenuated in front and furnished with 

 a compressed keel, which is elongated inwards, and surrounds a 

 middle-sized umbilical spot ; aperture rather oblique, narrow ; 

 parietal plaits two ; the upper one tooth-shaped, the other com- 

 pressed, touching the keel externally ; columellar plait simple, 

 oblique, strong, compressed, produced outwards to the margin ; 

 peristome narrowly expanded, furnished within, above the 

 middle, with a compressedly tooth-shaped callus, which is sinu- 

 ately prolonged to the base. Length 11, greatest breadth 8 mill. 

 Cassidula Bensoni, Pfr. in Malak. El. 1855, p. 7 ; Novit Conch 



i. p. 47. n. 82. 1. 12. f. 17, 18 ; Mon. Auric, p. 111. 

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

 Hab. Singapore (Dr. Bacon). 



