104 MOXODONTA. 



penultimate, 10-15 on the last whorl ; body-whorl depressed, obtusely 

 angulate around the periphery, eroded in front of the aperture ; 

 aperture very oblique ; outer lip acute, not thickened inside, black 

 edged, within pearly, iridescent, the nacre smooth but^ showing fine 

 folds like line within ; columella very oblique, arcuate, extending 

 upon the basal lip ; columellar area rather wide, concave. 

 Alt. 6-9, diam. 8*-10 mill. 



New Zealand ; Cook's Sts. 



T. coracinus TROSCHEL in PHILIPPI, Conchyl. Cab., p. 148, t. 24, 

 f. 13. FISCHER, Coq. Viv., p. 357, t. 110, f. 6. 



Allied to M, porcifer ; but differing in the smaller size, more 

 depressed body-whorl, angulate periphery and more conic shape. 

 I have copied the locality given above from Fischer, as the spec- 

 imens before me are without data. Hutton does not mention the 

 species in his Catalogue of N. Z. Mollusca. 



M. MELANOLOMA Menke. PL 22, figs. 56, 57. 



Shell i mperforate, globose-conical, solid, surface dull, roughened, 

 corroded, dark purplish, overlaid by a more or less eroded yellowish 

 white layer, coarsely obsoletely sublirate ; spire conic, apex eroded ; 

 whorls about 5, the last globose, not eroded in front of the aperture; 

 aperture oblique, nacreous and apparently smooth within ; outer lip 

 bordered by a narrow yellow or white followed by a black strip ; 

 columella short, oblique, sub-straightened, white, dilated upon the 

 parietal wall but not extending to the upper lip, slightly pitted at 

 the place of the umbilicus, subconcave. 



Alt. lo. diam. 16 mill. 



New Zealand. 



Monodonta melanoloma MKNKK, Moll. Nov. Holl., p. 14 (1843). 

 PHILIPPI, Conchyl. Cab., p. 146, t. 24, f. 9. Labio corrosa A. ADAMS, 

 P. Z. S. 1851, p. 180. Diloma corrosa, HUTTON, Manual X. Z. Moll, 

 p. 96. D. hectori HUTTON, Cat. Mar. Moll. JV. Z., p. 37. Iroclio- 

 cochlea chloropodaTATE, Zool. and Pal. Misc., p. 10 (Teste HUTTON). 

 -Monodonta melaloma HUTTON, Proc. Linn. Soc. N. S. Wales, 

 1884, p. 366. 



I follow Hutton in referring this form to Menke's M. melanohtim, 

 although I am not absolutely sure that such reference is correct. 



This species may be known by the corroded, dull appearance and 

 by the margin of yellow within the lip ; the columella is like that of 

 M. porcifer, but not so broad. My description and figures are from 



