436 GASTROPODA. [Pectinihrcmrhiu. 



8. Mitrella Websteri, n. nov. Plate 19, fig. 20. 



Columbella compta, Webst,, T.N.Z.I., xxxviii, 1905 (1906), 308, pi. 38, f. 9. 



Shell very small, elongated oval, spirally striate, thin, white. 

 Sculpture consisting of numerous fine and close spiral cords with 

 linear interstices, extending over the whole of the base, and crossed 

 by fine growth-lines. Colour white. Spire conical, its height a little 

 less than that of the aperture. Protoconch papillate, of 1| smooth 

 and polished whorls. Whorls 4, regularly increasing, lightly convex ; 

 base somewhat contracted. Suture well impressed. Aperture elongate, 

 narrow, sharply angled above, narrowed below, without a canal, base 

 slightly notched. Outer Up thin and sharp, straightened above, smooth 

 within. Columella vertical, straight. Inner lip almost obsolete, the 

 spiral sculpture extending to the interior. Operculum unknown. 



Diameter, 1 mm. ; height, 3 mm. (type). 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hab. Off Great Barrier Island, in 110 fathoms. 



Remark. The two specimens obtained in 110 fathoms are evidently 

 not adult. Webster's specific name is preoccupied by Broun, 1832, 

 and Lischke. 1873, and I therefore propose the above name. 



Genus 2. ANACHIS. H. and A. Adams, 1853. 



Anachis, H. & A. Ad., Ad. G.R.M., i, 1853, 184. Type : Columbella rugosa, 

 Sowerby. Seminetta, Pease, 1867. Mitropsis, Pease, 1867. Costoanachis 

 and Ecostoanachis, Sacco, 1889. 



Siicll small, ovately fusiform, axially ribbed, the ribs getting 

 sometimes obsolete on the last whorls, interstices with fine spiral 

 cords : aperture narrow, the margins nearly parallel, with a rudi- 

 mentary canal below ; columella straight ; outer lip nearly straight, 

 with a posterior sinus, crenulated within. 



The species are chiefly American and Polynesian in their distri- 

 bution. 



Two species occur in the Pliocene of New Zealand. 



KEY TO SPECIES. 



A. Penultimate whorl with 3, body-whorl with 8 nodulous cinguli, 



reticulated by fine axial riblets : suture margined . . nodicincfa. 



B. Penultimate whorl with 6 to 7, body-whorl with 16 to 17 lightly 



granular cinguli, crossed by 1618 axial riblets ; suture 



simple . . . . . . . . . . . . sitbabnormis. 



1. Anachis nodicincta, Suter, 1899. Plate 19, fig. 21. 



Cluthurella nodicincta, Sut., T.N.Z.I., xxxi, 1898 (1899), 74, pi. 3, f. 5 ; 

 Index, 71. Mangilia (Clathurellu) nodocincta, Sut., J. Mai., xii, 73. 



Shell fusiform, turreted, solid, cream-coloured, clathrate. Sculp- 

 ture consisting of strong elevated cinguli, 3 on the spire- whorls. 8 

 on the body-whorl, those on the periphery stronger than the others ; 



