Schismope.] GASTROPODA. 91 



callous. Umbilicus rather large and deep. Anal perforation with 

 raised margins, moderately long, rounded behind, pointed in front, 

 with a very distinct callosity on the inner side. 



Diameter, 0-75 mm. ; height, 1 mm. (type). Diameter, 1-5 mm. ; 

 height, 1-25 mm. (Snares specimen). 



Type in the Tasmanian Museum, Hobart. 



Hab. Foveaux Strait (A. Hamilton) ; Snares and Bounty Islands, 

 in 50 fathoms (Captain Bollons). Australia and Tasmania. The type 

 is from the north coast of Tasmania. 



Remark. The New Zealand specimens attain a larger size, and are 

 more depressed, but otherwise there is no difference. 



3. Schismope brevis, Hedley, 1904. Plate 6, fig. 14. 



Schismope brevis. Hedley. Rec. A.M., v. 1904. 90, f. Hi in text ; Iredale. 

 T.N.Z.I., xl. 381. 



Shell depressed, turbinate, openly perforate to imperf orate, solid. 

 Sculpture : Distant longitudinal lamellate ribs cross the whorl from the 

 suture to the umbilicus ; their interstices contain raised spiral threads, 

 which grow coarser on approaching the umbilicus. Colour white. 

 Protoconch of a whorl and a half, concluding with a prominent varix. 

 Whorls 3, tabulate above, rounded below, the last rapidly descending. 

 Aperture roundly ovate. Outer Up sharp, convex. Inner lip spreading 

 as a distinct callosity over the body, and sometimes sealing the um- 

 bilicus partly or wholly up. Columella concave. Umbilicus narrow, 

 deep, bordered with a raised ridge, or closed up. The foramen is large, 

 distant from the margin, to which a furrow joins it. The fasciole 

 extremity short, terminating half a whorl behind the aperture, bordered 

 by keels and traversed by lamellae, which correspond to the longitudinal 

 ribs. 



Diameter Maj.. 1-14 mm. ; min., 0-9 mm. : height, 0-94 mm. 

 (type). 



Type in the Australian Museum, Sydney. 



Hab. Lyall Bay, near Wellington, type (A. Hamilton) ; Snares, 

 in 50 fathoms (Captain Bollons) ; Lyttelton Harbour (Iredale). Living 

 on seaweeds. 



EemarTfs. All the specimens from the Snares I have seen have the 

 umbilicus more or less closed up. Live shells from Lyttelton Harbour 

 are cream-coloured, young ones very commonly brownish (Iredale). 



Subsp. levigata, Iredale, 1908. 



Schismope brevis, Hedley, subsp. levigata, Iredale. T.N.Z.I., xl, 1907 (1908), 

 381. 



This subspecies differs from the type in the degree of sculpture. 

 At first sight it would appear a very different shell, but when closely 

 examined the sculpture is seen to be the same : the longitudinal ribs 

 have greatly deteriorated in strength, whilst the spirals have gained ; 



