104 MONODONTA. 



penultimate, 10-15 on the la^t whorl ; body-whorl depressed, obtusely 

 angulate around the peri2:)hery, eroded in front of the aperture ; 

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

 edged, within pearly, iridescent, the nacre smooth Init showing fine 

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

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

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



New Zealand ; Cook's Sts. 



T. coracimis 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 X. Z. Mollusca. 



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



Shell imperforate, globose-conical, solid, surface dull, roughened, 

 corroded, dark purplish, overlaid b}^ 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 ap2:)arently smooth within ; outer lip 

 bordered by a narrow yellow or Avliite 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. 15, diam. 16 mill. 



Ne■^v Zealand. 



Monodonfa melauoloma yiE^KE, Moll. Nov. Hall., p. 14 (1843). — 

 Philippi, Conchyl. Cab., p. 146, t. 24, f 9. — Labio corrosa A. Adams, 

 P. Z. S. 1851, p. 180. — Diloma corrosa, liuTToy , Manual N. Z. Moll., 

 p. 96. — D. hectori Hutton, Cat. Mar. Moll. N. Z., p. 37. — Irocho- 

 cochlea chloro})odaTATE, 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 INIenke's M. nielanoloma, 

 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. ]\Iy description and figures ai-e from 



