i8 2 DISCOVERY REPORTS 



sharp regularly spaced axials, fourteen on the last whorl. These axials extend from the 

 upper suture right over the body whorl and base and into the umbilicus. In addition 

 there are four equispaced spiral threads of less than half the strength of the axials. 

 These spirals do not surmount the axials but they have the effect of rendering the latter 

 somewhat angulate. Surface of shell smooth and polished. Umbilicus wide, per- 

 spective, about one-fourth the major diameter of the base. Aperture circular within. 

 Peristome continuous, smooth, expanded, and angled by the terminal points of the four 

 spirals; adnate to the parietal wall for a very short space. 



Height o-8 mm.; major diameter 1-5 mm.; minor diameter i-a mm. (Holotype). 



Habitat: Off Three Kings Islands, St. 933, 260 m. 



Closely allied to M. ozoengaensis, Powell, 1933 (Rec. Auck. Inst. Mus., 1, No. 4, p. 195), 

 differing only in having the four spirals more prominent and more widely spaced. In 

 owengaensis, which is from the Chatham Islands, the spirals are grouped about the 

 periphery, whereas in manawatawhia they extend from midway between the upper 

 suture and the periphery to a corresponding position on the base. 



Genus Liotella, Iredale, 191 5 

 Type (original designation) : Liotia polypleura, Hedley 



Liotella aupouria, n.sp. (Plate LI, fig. 9). 



Shell minute, discoidal, thin, white, widely umbilicate, densely radially ribbed. 

 Whorls 3 1, including a typical low convex smooth protoconch of i| whorls. Spire not 

 raised above the body whorl. Sculpture consisting of very numerous strong radial 

 rounded riblets (forty-five on the last whorl) with interspaces at the periphery, 1-1I times 

 the width of the ribs. At the suture the riblets are crowded together with only linear 

 interspaces, and the last four riblets on the body whorl are similarly crowded but for 

 their entire length. The interspaces of the riblets are crowded with fine spiral striations. 

 Umbilicus wide, steep-sided at first but perspective within, about one-third the major 

 diameter of the shell. Aperture circular. Peristome entire, thin. 



Height o-6 mm. ; diameter 1-2 mm. (Holotype). 



Habitat: Off Three Kings Islands, St. 933, 260 m. 



This species resembles L. neozelanica (Suter, 1908) from 50 fathoms off the Snares 

 Islands, but is distinct from it in having even closer ribbing, a flat but not sunken spire, 

 and spirally striated instead of smooth intercostal spaces. 



Liotella rotuloides, n.sp. (Plate LI, fig. 8). 



Shell minute, discoidal, thin, white, widely umbilicate, sculptured with numerous 

 radial riblets and dense intercostal spiral striae. Whorls 3^, including a typical low convex 

 smooth protoconch of i\ whorls. Spire flat, not raised above the body whorl. The 

 spiral riblets are prominent and rounded and have the interspaces about three times the 

 width of the riblets, except at the termination of the body whorl where the last five riblets 

 are closely packed. There are twenty-eight radials on the last whorl. Umbilicus wide, 



