322 GASTROPODA. [Pectinibranchia. 



Hub. Auckland Harbour, among shell-sand (Cheeseman) ; Wha- 

 ngarei Heads (C. Cooper) ; Gisborne (A. Hamilton) ; Cook Strait : in 

 2 to 10 fathoms. Also Australia and Tasmania. 



Remark. Of E. wellingtonensis, Kirk, three type specimens are in 

 the Dominion Museum ; they are not E. philippinarum, as suggested 

 by Try on. 



Sect. 3. OPALIA, H. and A. Adams, 1853. 



Opalia, H. & A. Ad., Ad. G.R.M., i, 222. First species : Scalaria australis, 

 Lam. Clathrus, Gray ; not of Oken. 



Shell turreted, imperforate ; whorls not disunited, the last with 

 a conspicuous spiral ridge round the umbilical region. 



4. Epitonium Zelebori, Drinker, 1866. Plate 46, fig. 8. 



Scalaria Zelebori, Dkr., V.Z.B.G. Wien, xvi, 1866, 912. Scala (Opalia ?) 

 Zelebori, Dkr. : Frauenfeld, " Novara " MoU., 1867, 7, pi. 1, f. 6. 

 Scalaria intermedia, Hutton, Cat. Tert. M., 10. S. Zelebori, Dkr. : 

 Button, C.M.M., 21 ; M.N.Z.M., 69. -S'. Reevei, Clessin, Conch. Cab., 

 Scalariidse, 1897, 63, pi. 15, f. 9 ; Suter, J. Mai., vii, 54. S. Zelebori, 

 Frfld., Man. Conch. (1), ix, 78, pi. 15, f. 75. 



Shell of moderate size, solid, white, imperforate, with axial and 

 spiral sculpture, not shining. Sculpture consisting of rather distant, 

 oblique, thick, and denticulate axial ribs, continuous over the whorls 

 and extending over the base, angularly produced above, 13 to 16 

 on the last whorl ; interstices with 6 to 8 rounded and prominent 

 spiral ribs, with fine spiral striae between them ; base with a distinct 

 spiral keel. Colour white. Spire elevated conic, about five times 

 the height of the apertiire ; outlines straight. Protoconch of 2 smooth 

 and strongly convex whorls ; apex sharply pointed. Whorls 10 to 11, 

 regularly increasing, convex ; base slightly concave. Suture very 

 deep, the costee passing angularly over it. Aperture almost circular, 

 oblique. Peristome continuous. The outer lip outside varicose and 

 denticulate. Basal lip slightly expanded below the pillar. Colu- 

 mella short, arciiate, rounded. Inner lip not expanded. Operculum 

 not known. 



Diameter, 8 mm. ; height, 24 mm. (type). Angle of spire, 28. 



Animal unknown. 



Type in the K.K. Hofmuseum, Vienna. 



Hob. Ahipara Beach ; Bay of Islands ; Whangarei Heads (C. 

 Cooper) ; Auckland Harbour, and dredged near Waiwera (Cheese- 

 man) ; off Great Barrier Island, in 110 fathoms ; Tauranga ; Stewart 

 Island ; Chatham Islands ; Kermadec Islands. 



Fossil. Miocene and Pliocene. 



Sect. 4. ACRILLUS, H. Adams, 1860. 



Acrillus, H. Ad., P.Z.S., 1860, 241. Type : Scalaria acuminata, Sow. 

 Shell moderately thick, turritelliform ; whorls united, with very 

 numerous filiform ribs, last whorl with subcarinated periphery ; lip 

 of aperture thin. 



