Mukdoch and Suter. — Results of Dredging . 293 



and tapering. Protoconch consists of about two smooth rounded 

 whorls, the second with a slightly swollen aspect, the nucleus 

 oblique. Whorls 7, slightly rounded ; the antipenultimate 

 whorl is indistinctly feebly bicarinate ; this is better defined 

 upon the next whorl, especially the superior angle which forms 

 the subtabular suturial shelf ; upon the last four or five feeble 

 carinse, three of which are above the aperture, the base rounded. 

 Suture deep. Aperture vertical, subtriangular. Outer lip sharp, 

 regularly curved, effuse and angled at the junction with the 

 basal extension of the columella, producing a small spout- like 

 canal. Inner lip forming a narrow thin callosity on the pillar, 

 which is subvertical and slightly sinuated ; a thin callus ex- 

 tends above over the body to the outer lip. Umbilicus very 

 narrow, open. Altitude, 2-9 mm. ; diameter, 1-04 mm. 



Type in the Colonial Museum, Wellington. 



Obs. A single dead shell was found, which adds a genus to 

 the New Zealand fauna. 



37. Natica zelandica, Quoy and Gaimard. 

 Voy. AstroL, Zool., vol. ii, p. 237, pi. lxvi, figs. 11, 12, 1832. 

 A young dead shell which has lost the outer calcareous layer. 



38. Natica australis, Hutton. 



Journ. de Conch., vol. xxvi, p. 23, 1878. 



A good number of specimens were found, all dead shells, 

 white, porcellaneous. 



39. Calyptraea scutum, Lesson. 



Voy. " Coquille," Zool, vol. ii, p. 395, 1830. 

 A few young dead shells. 



40. Omalaxis amoena, n. sp. Plate XXIV, figs. 30-32. 



Shell small, discoidal, bicarinate, beautifully sculptured, 

 sides straight but oblique, umbilicus wide, carinated, perspective. 

 Sculpture : Upper side with a beaded cord on each side of the 

 suture, the outer one being more prominent ; between them are 

 three fine elevated spiral threads, the whole crossed by numerous 

 oblique elevated radiating ridges, with equal interspaces, which 

 continue over the periphery to the basal cord ; on the periphery 

 is a third beaded and conspicuous cord, which is buried in the 

 suture ; still another marginates the base, and between them 

 are three small spiral ridges. Between the basal and umbilical 

 ribs is a small beaded spiral, the whole reticulated by somewhat 

 irregular distant radiate ribs, interstices having now and again 

 one or more fine ridges ; the umbilical rib distinctly beaded. 

 Colour white. Spire flat. Protoconch dextral, smooth, con- 



