Ejritoniuin.] GASTROPODA. 323 



5. Hpitonium levifoliatum, Murdoch and Suter, 190G. Plate 16, 



fig. 1. 

 Scala levifoliata, M. & S., T.N.Z.I., xxxviii, 1905 (1906), 295, pi. 25, f. 35, 36. 



Shell small, turreted, imperforate, longitudinally finely laminated. 

 Sculpture : Spire-whorls bicarinate, the slope uniform from the suture 

 to the upper carina, situate on the lower half of the whorls ; the lower 

 carina is less conspicuous, and close to the suture ; last whorl tri- 

 carinate with the basal keel microscopically granulate, below this is 

 a well-marked furrow bounded by a small concentric rib, which margins 

 the columella ; on the lower part of the shoulder 2 indistinct spiral 

 threads, more obscure on the upper whorls ; the axial sculpture 

 consists of oblique, close, delicate, undulating, and sharp laminations, 

 extending over the suture, and terminating at the basal carina. Colour 

 greyish-white. Spire elongate, turreted, sharply pointed, about four 

 times the height of the aperture. Protoconch of 2 small rounded 

 whorls, the nucleus with the initial half-turn smooth, the other half 

 radiately delicately ribbed, the second whorl with sharp laminations. 

 Whorls 10, regularly increasing, with straight sides above the keel, 

 concave between the encircling ribs. Suture deep and channelled, 

 which character is partly hidden by the axial laminae passing over it. 

 Aperture ovate, angled above. Outer and basal Up rounded, slightly 

 effuse, sharp, and with flexuous projections corresponding to the spiral 

 keels. Columella concave, very little callous, terminating in a minute 

 sharp point. 



Diameter, 1-62 mm. ; height, 5-7 mm. 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hob. Off Great Barrier Island, in 110 fathoms (type) ; Little 

 Barrier Island, in 20 fathoms (R. H. Shakespear) ; near the Snares, 

 in 50 fathoms (Captain Bollons). Also dredged in 80 fathoms twenty- 

 two miles east of Narrabeen, New South Wales, by Mr. C. Hedley. 



Genus 2. CROSSEA, A. Adams. 1865. 



Crossea, A. Ad., A.M.N.H. (3), xv, 1865, 323. Type : C. miranda, A. Ad. 

 Shell small, umbilicate, conical or turbinate ; whorls convex, re- 

 ticulated, simple or varicose ; aperture rounded, prolonged anteriorly, 

 where it is deeply notched and somewhat canaliculate ; umbilicus 

 bordered by a long, curved, raised rim, which is often crenulated. 

 Distribution. Japan, Australia, Tasmania, and New Zealand. 

 Fossil in the Tertiary of Australia. 



KEY TO SPECIES. 



A. Shell smooth, except a prominent ridge on the base, and a second 



arising from the umbilicus . . . . . . . . ijlabella. 



B. Shell sculptured. 



a. Surface spirally lirate, a smooth zone above the umbilical rim labiata. 

 an. Body-whorl with 6 spiral lira? and a faint 7th on the base, 



the interspaces cancellated by axial riblets . . . . cancellata. 



11* 



