. Mollusca ... Fig. 66.—Austenia gigas, Bs. suture impressed; whorls about 2, very rapidly increasing, thelast depressed above, occupying the greater part of the shell;aperture very large and oblique, ovate, the margins nearly meeting,the columellar strongly arcuate. Major diam. 30, min. 17, alt. 10 mm. A large specimenmeasures 40 x 25 x 12 mm. Bah. Khasi Hills, common about Teria Ghat. Allied species inArakan Eange, west of Prome, and Kyoiik Phyu and EamriIsland. AUSIENIA. 193 The length of the animal, when fully extended, is about6 inches. A considerable portion of the shell remains exposed(
. Mollusca ... Fig. 66.—Austenia gigas, Bs. suture impressed; whorls about 2, very rapidly increasing, thelast depressed above, occupying the greater part of the shell;aperture very large and oblique, ovate, the margins nearly meeting,the columellar strongly arcuate. Major diam. 30, min. 17, alt. 10 mm. A large specimenmeasures 40 x 25 x 12 mm. Bah. Khasi Hills, common about Teria Ghat. Allied species inArakan Eange, west of Prome, and Kyoiik Phyu and EamriIsland. AUSIENIA. 193 The length of the animal, when fully extended, is about6 inches. A considerable portion of the shell remains exposed(this doubtless varies in extent). The teeth of the radula arethus arranged : 69 . 3 . 22 .1 . 22 . 3 . 69 (94 .1 . 94) ; the numberof broad inner lateral (admedian) teeth being very large. Therhachidian tooth is bluntly tricuspid, the next 6 on each side have. [Pig. 67.—Ausienia gigas. A. Animal from a spirit-specimen, viewed from both the right and left sides, showing shell- and dorsal lobes ; in the former, cav. is the posterior endof tbe cavity in the foot occupied by the internal organs. B. Genitalia : the spermatheca filled with spermatophores. C. A spermatophore taken from tbe spermatheca. D. Penis, showing spermatophore in process of formation. E. Jaw and teeth of the radula.] O 194 ZONITIDjE. only a blunt outer cusp, afterwards an inner cusp becomes outer laterals bicuspid, with a long point and an additionalcusp low down on the outer side ; the extreme marginals aresimple unicuspid teeth. The general colour of the animal as represented in the figuresis an umber-brown, the furrows on the upper surface beingdarker. 290. Austenia butleri, Godwin-Austen (Girasia), Mol. Ind. i, 1888, p. 226, pi. 60, fig. 7 ; id. op. cit. ii, 1899, p. 108, pl.^90, figs. 5-10. Helicarion gigas, Bs., small var., J. A. S. B. xliv, 1875, p. 6,
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