GASTEROPODA i97 



by the New Zealand Pliocene species E. semisulcata (Hutton). Furthermore I have 

 recently found semisulcata to be a still-living species, occurring in from 6 to 10 fathoms 

 off the Great Barrier Island and off the Little Barrier Island in 20 fathoms. 



Estea porrectoides, n.sp. (Plate LIII, fig. 1). 



Shell small, elongate, subcylindrical, solid and smooth, except for microscopic very 

 irregular axial growth striae. Whorls six, including a low dome-shaped protoconch of 

 1 \ whorls, microscopically sculptured with numerous exceedingly fine and closely 

 spaced punctate spiral striae. Spire tall, about twice height of aperture. Outline of 

 whorls almost straight. Aperture oblique-oval. Peristome continuous, much thickened. 

 There is no umbilical chink. Colour light reddish brown, becoming lighter over body 

 whorl. Peristome and interior of aperture light buff. 



Height 2-55 mm.; diameter i-i mm. (Holotype). 



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



This species is very near to E.porrecta, Powell 1933 (Rec. Anck. Inst. Mus., 1, No. 4, 

 p. 201) from Waitangi, Chatham Islands. The new species differs in having a relatively 

 shorter spire, a larger aperture, more massive peristome, and flatter whorl outlines. 



Estea crassicordata, n.sp. (Plate LIII, fig. 17). 



Shell minute, obtusely conical, very solid, opaque, white. Sculptured with heavy 

 rounded spiral cords having linear interspaces. Whorls 3f, including a low convex 

 protoconch, similar to that of the preceding species. Apex of protoconch smooth, but 

 four spiral cords commence after the first half-whorl and continue over the first post- 

 nuclear whorl with the addition of an inconspicuous subsutural fifth. Penultimate 

 whorl with five strong cords and a weaker subsutural sixth. Body whorl with the addi- 

 tion of eight basal moderately strong spiral cords. Spire about 1^ times height of 

 aperture. Aperture small, circular. Peristome continuous, edge thin but much thickened 

 within the aperture. There is no umbilical cavity, but the inner lip callus is much 

 thickened and raised above the base. 



Height 0-9 mm.; diameter o-6 mm. (Holotype). 



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



This is closely allied to the preceding species, having the same style of protoconch, 

 but differs in having many more spirals and in the shell being smaller and more squat. 



Estea subrufa, n.sp. (Plate LIII, fig. 2). 



Shell small, solid, elongate-conic with a much inflated body whorl but narrowly 

 conical spire with straight sides. Spire if times height of aperture. Whorls 4I, including 

 a low dome-shaped protoconch of i| whorls which is faintly sculptured with about 

 sixteen rows of spiral punctate lines. Post-nuclear whorls smooth except for very faint 

 irregular growth lines. Aperture almost circular. Peristome continuous across parietal 

 wall as a thin callus defined by a ridge at its outer extremity. Outer lip thin at edge but 

 thickened within. Columellar portion of peristome slightly expanded. There is no 

 umbilicus but just a semicircular fold behind the expanded columellar lip. There is a 



