324 GASTROPODA. [Pectinibranchia. 



1. Crossea cancellata, T.- Woods, 1878. Plate 16, fig. 2. 



P.R.S. Tas., 1881 (1882), 31 ; 1882 (1883), 169. 



Shell small, globosely turbinate, perforate, fairly solid, with con- 

 spicuous axial and spiral ribs. Sculpture consisting of prominent 

 spiral ribs, 3 on the upper whorls, 6 on the, body-whorl, 4 of which 

 are above the suture ; there is a faint indication of a seventh spiral 

 on the base ; the second, third, and fourth spirals are stronger than 

 the others, smooth and rounded ; interstices broader than the spirals ; 

 axial sculpture formed by equidistant, oblique, somewhat strong 

 riblets, which do not pass over the spiral cords, but strongly can- 

 cellate their interspaces, and extend over the whole of the base ; the 

 umbilical rim very stout and finely crenulated by the axial riblets. 

 Colour white. Spire depressed conoidal, about as high as the aperture ; 

 outlines convex. Protoconch small, of 1 smooth whorl, flatly convex. 

 Whorls 4, convex ; base rounded. Suture distinct. Aperture sub- 

 vertical, almost circular, broadly angled above, typically canaliculated 

 at the base, but my New Zealand examples show this very indis- 

 tinctly. Peristome continuous, thick, and blunt. Columella vertical, 

 somewhat arcuate, produced below into a tongue-shaped process, 

 and leaving a deep groove between it and the umbilical callosity. 

 Perforation narrow. Operculum unknown. 



Diameter, 2-5 mm. ; height, 2-6 mm. (specimen from Whangaroa). 



Animal unknown. 



Type in the Tasmanian Museum, Hobart. 



Hab. Whangaroa Harbour ; near Cuvier Island, in 38 fathoms 

 (Captain Bollons). Also Tasmania and Australia, in 20 fathoms. 

 The type is from Blackmail's Bay, Tasmania. 



2. Crossea glabella, Murdoch, 1905. Plate 16, fig. 3. 



Crossea glabella, Murcl., T.N.Z.I., xxxvii, 1904 (1905), 225, pi. 8, f. 16, 17. 



Shell minute, turbinate, smooth, and rather solid. Sculpture 

 none, except a prominent ridge on the base bounding a broad de- 

 pression, and a second ridge arising from the umbilicus. Colour 

 white, somewhat shining. Spire depressed, less than the height of 

 the aperture ; outlines convex. Protoconch consisting of U smooth 

 and convex whorls, the nucleus rather large and globose. Whorls 3, 

 convex ; base somewhat convex. Suture distinct, not deep, margined 

 below by a narrow ridge, followed by a slight depression. Aperture 

 subcircular, angled above, and slightly canaliculated below. Outer 

 lip thin and sharp. Columella vertical, arcuate. Inner lip slightly 

 reflected, covering only a small part of the umbilicus. Basal lip 

 with 2 well-marked expansions, produced by the two basal ridges, 

 Umbilicus narrow, deep. Operculum unknown. 



