,8o DISCOVERY REPORTS 



than height of aperture. Sculpture of post-nuclear whorls consisting of fine closely 

 spaced lirations, nine on the penultimate whorl and about thirty on the body whorl, ten 

 of these being between the upper suture and the periphery and the remaining twenty 

 (which are finer and more closely spaced) from the periphery over the base to the ridge 

 that margins the umbilicus. There is a moderately wide ill-defined subsutural shoulder 

 bearing weak closely spaced short radials which at most inconspicuously bead the 

 uppermost spirals only. Umbilicus deep and wide, a little more than one-third the 

 diameter of the shell and bordered by a heavy rounded spiral ridge, which is weakly 

 crenulated by fine axial growth folds. Colour : protoconch buff, early spire whorls lemon 

 yellow, remainder of shell pale ochreous buff. On the dorsal surface only there are a 

 few rather narrow wavy irregular radial bands of reddish brown. 



Height 3-5 mm.; major diameter 5-4 mm. (Holotype). 



Habitat: Off Spirit's Bay, St. 929, 59m. (type locality); and St. 931, between 

 Spirit's Bay and Three Kings Islands, 95 m. 



This species appears to be intermediate between the genotype plicatula and luteola, 

 described above. It has finer and more numerous spirals than plicatula and a heavy 

 spiral rib bounding the umbilicus, resembling that of luteola. However, the deeper- 

 water luteola differs in being smooth except for the early spire whorls and in having a 

 distinctive colour pattern of light red chevrons in two series, one sutural and the other 

 peripheral. 



Zeminolia benthicola, n.sp. (Plate LI, fig. 4). 



Shell small, turbinate, umbilicate. Whorls five, including small smooth bulbous 

 protoconch of one whorl. Spire a little more than height of aperture. Sculpture of 

 narrow sharply raised spiral ridges, and closely packed fine raised axial threads, which 

 are prominent in the interspaces, but do not surmount the spiral ridges. On the first 

 post-nuclear whorl there are three spiral ridges, four on the second, and additional 

 secondary interstitial ones on the later whorls. On the body whorl there are the four 

 main spiral ridges with a secondary ridge in each interspace, and on the base nine 

 closely spaced rounded spiral ridges extending from just below the periphery to the 

 edge of the umbilicus. Inside the umbilicus there are five rather distantly spaced rounded 

 spiral ridges as well as the closely spaced axials. Umbilicus deep, about one-sixth major 

 diameter of the base. There is a broad flattened subsutural shoulder upon all the post- 

 nuclear whorls. Aperture subcircular, adnate to parietal wall for a very short space. 

 Colour : pale lemon yellow with indistinct radial blotches of darker yellow, and, situated 

 upon the shoulder angle, regularly spaced small squarish blotches of red-brown. 



Height 5 mm.; major diameter 5-5 mm. (Holotype). 



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



This species is near to Z. tryphenensis, Powell, 1930, but is not so depressed, has more 

 sharply defined sculpture, and a narrower umbilicus. The chief feature of the species 

 is its prominent crowded axial threads. 



