STOMATELLA. 17 



below the periphery, the spiral riblets dotted minutely with white. 

 Surface lusterless, sculptured with narrow, acute, slightly granose 

 spiral riblets, their interstices bearing numerous, unequal spiral stria? 

 or threads ; decussated by very close, fine stria? of growth ; the spiral 

 riblets obsolete in the center of the base. Whorls 5?, the apical 2 

 smooth, corneous, rounded ; the last large, rapidly increasing, briefly 

 descending anteriorly ; aperture oblique, oval-quadrate, sulcate with- 

 in, and pearly, the iridescence chiefly emerald-green within the 

 throat, more silvery on outer lip ; columella narrowly reflexed over 

 a minute umbilical chink, bordered by a crescentic white tract. 



Alt. 13, diam. 18 mill.; aperture, breadth 12, oblique alt. 11 

 mill. 



Darnley Id., Torres Sts. (Brazier), Mozambique (Cuming), Japan 

 (Dkr.). 



S. orbiculata A. Ad. P. Z. 8. 1850, p. 31 ; Thes. Conch, ii, p. 837, 

 t. 174, f. 23, 24. — Sowerby in Conch. Icon., f. 23. — Brazier, Proc. 

 Linn. Soc. 1ST. S. W. ii, p. 47. — Dunker, Ind. Moll. Mar. Jap., p. 

 145. 



The columella and aperture are quite similar in form to S.mariei; 

 but the shell is much less depressed and more coarsely spiralled than 

 that species. 



S. rufescens Gray. PI. 51, fig. 11. 



Shell suborbicular, rather depressed, brown. Spire conical, rather 

 acute. Whorls rapidly enlarging, rather convex, concentrically 

 striated with rather unequal acute spiral ridges, the upper whorls 

 with two or three of the ridges larger and higher than the rest, the 

 last with closer, less raised ridges in front. Mouth oblong, two- 

 thirds the diameter of the shell in width, inner lip arched, edge 

 crenulate. Axis imperforated ; throat silvery pearly, with a pale 

 reddish edge. (Gray.) 



Maine's Island, N. Australia. 



S. rufescens Gray, in Appendix to Jukes' Narrative of the 

 Voyage of H. M. S. ' Fly, ' ii, p. 360, t. 2, f. 2 (1847). 



S. selecta A. Adams. PL 53, fig. 73. 



Shell Haliotis-shaped ; spire rather prominent ; subperforate, 

 greenish, maculated and dotted with red, brown and white ; longitu- 

 dinally obliquely striated, transversely lirated ; umbilical region 

 Avhite, smooth ; aperture vividly pearly within ; columella reflexed 

 above, partly covering the umbilicus. 



