AURICULID^E. 109 



horizontal ; the last columellar, thick, twisted ; peristome bor- 

 dered with a chestnut streak ; right margin thin above, then 

 thickened internally. Length 6k, breadth 3 mill. 



Auricula (Conovulus) frumentum, Petit in Revue Zool. 1842, 



p. 105. 

 Auricula frumentum, Pfr. Syn. Auric, n. 150 ; Mon. Auric, p. 142. 

 Cassidula (Siona) frumentum, H. and A. Adams in Proc. Zool. 



Soc. 1854, p. 32. n. 15. 

 Cassidula (Sanaa) frumentum, II. and A. Adams, Gen. rec. Moll. 



ii. p. 239. 



Hab. Callao, Peru {Petit), and Marquesas Islands. 



30. Auricula ave^a. 



Shell imperforate, cylindrical, rather solid, nearly smooth, 

 sculptured irregularly with stripe of growth, yellowish-fuscous ; 

 spire convexly conoidal, rather blunt, pale ; suture linear ; 

 whorls five, flat, the last forming more than three-fourths of 

 the total length, indistinctly angled above, slightly attenuated 

 at base ; aperture perpendicular, narrowly semiovate, with three 

 plaits ; upper plait small, knot-shaped ; second plait parietal, 

 thick, rather horizontal ; columellar plait callous, dentiform ; 

 peristome straight, blunt; right margin sinuate above, thick- 

 ened within at its middle part, basal margin passing imme- 

 diately into the columellar plait. Length 65, breadth 3^ mill. 



Auricula (Conovulus) avena, Petit in Revue Zool. 1842, p. 100. 

 Auricula avena, Kiist. Auric, p. 48. t. 7. f. 17-19 (?). 



Pfr. Syn. Auric, n. 151 ; Mon. Auric, p. 143. 

 Cassidula (Siona) avena, H. and A. Adams in Proc. Zool. Soc. 



1854, p. 32. n. 14. 

 Cassidula (Sarnia) avena, It. and A. Adams, Gen. rec. Moll. ii. 



p. 239. 



Hab. Near Valparaiso, Chili. 



31. Auricula ? pellucida. B.M. 



" Shell very small, ovate, obtuse, whitish, shining ; spire 

 short ; longitudinally and transversely finely striated; labrum 

 not reflexed ; columella with two folds." — Cooper. 

 Auricula pellucida, Cooper, Microscopic Journ. 1841, p. 10. 

 Melampus (Tralia) pelluciuus, H. and A. Adams in Proc. Zool. 



Soc. 1854, p. 11. 



Pfr. Mon. Auric, p. 58. 

 Tralia pellucida, II. and A. Adams, Gen. rc'c, 3Ioll. ii. p. 244. 

 Hub. Van Diemen's Land. 



