Drupa.] GASTROPODA. 42'. 



Dentition. Central tooth with a long simple median cusp, followed 

 on each side by a. quadridentate cusp, with the median tooth large, 

 the inner denticle much smaller, and the outer two minute ; towards 

 the margin there are on each side 4 small denticles, the distal one a 

 little larger. 



Type in my collection. 



Hab. Bay of Islands (J. C. Anderson) ; L'Esperance or French 

 Rock, Kermadecs, type (Captain Bollons). Lord Howe Island. 



Fam. CANCELLARIID^, Adams. 



Animal having the eyes at the outer bases of the tentacles ; snout 

 short ; foot small ; siphon short. Radula with 2 rows of subulate 

 narrow teeth ; no central tooth ; formula 1 -\- + 1. 



Shell ovoid, sometimes subturriculate ; protoconch paucispiral, 

 globular ; surface generally cancellate ; aperture more or less tri- 

 angular, usually canaliculate above and with a rudimentary canal 

 below ; outer lip thick or varicose, crenate or toothed inside ; colu- 

 mella more or less concave, with 2 or 3 plaits, the lowest of them very 

 often absorbed in the twist of the columella. There is no operculum. 



Genus 1. ADMETE, Kroyer, 1842. 

 Admete, Kroyer, Index Moll. Groenl., 1842. Type : A. viridula, Fabr. 



Shell oval, thin, diaphanous, with epidermis, mostly small, without 

 fasciole and umbilicus ; whorls always spirally lirate, mostly cancel- 

 lated by axial riblets, convex or shouldered ; spire conic, sharp ; proto- 

 conch smooth, small, obtuse ; aperture oval, not channelled above, 

 with a very short notched canal below ; columella with 3 equal and 

 oblique plaits, the lowest coinciding with the twist of the columella 

 and continued into the basal beak ; outer lip thin, smooth inside. 



The genus is arctic and subantarctic in its distribution. From 

 the Southern Hemisphere it is recorded from Chile, the Strait of 

 Magellan, Kerguelen's Land, and New Zealand. 



Fossil from the end of the Cretaceous. 



Remark. Dr. J. Thiele found only one longitudinal row of teeth 

 in the radula of Cancellaria Verreauxi, Kiener ; and also a jaw, but no 

 radula, in Admete viridula, Fabr. (Die beschalten Gastrop. d. deutsch. 

 Tiefsee Exped., 1903, p. 171, 172). 



1. Admete Trailli, Hutton, 1873. Plate 19, fig. 12. 



Cancellaria Trailli, Hutt., C.M.M., 26 ; J. de Conch., 1878, 25 ; M.N.Z.M. 4*i ; 

 P.L.S. N.S.W., ix, 936 ; Plioc. M., 58, pi. 7, f. 52, Index. 71. 



Shell small, oval, thin, semitransparent, cancellated, more or less 

 distinctly turreted. white. Sculpture consisting of numerous close, 

 sometimes unequal, flatly convex spiral lirae, the interstices very 

 often with a fine spiral thread, crossed by equidistant low axial riblets, 

 disappearing on the base, the crossing-points raised into oval low 



