Tornatellina.] GASTROPODA. 769 



Genus 1. TORX.\T;-'U.I\A, Beck. 1837. 



Toniiiti'llim/, Ueck, Index Mollusc., 1837, 80. Type : T. trochlearis, Beck. 

 l'J<i*>n<itina, Petit de Saussaye, IS!",. 



Radula with the teeth in very oblique rows, central, lateral, and 

 marginals all of the same type. ba.s* na.irow. reflection rather broad, 

 with numerous small denticles. 



Shell oval or subtrochiform, pellucid, small ; coltimella tortuous, 

 truncated ; parietal wall with 1 or move lamella" ; neristome simple, 

 discontinuous. 



Distribution. Islands of the Pacific Ocean. 



KEY TO SPECIES. 



a. Shell imperforate ; spire 2^ times the height of the aperture ; 



colurnella strongly twisted . . . . . . . . novosedandicn. 



b. Shell subperf orate ; spire very little higher than the aperture ; 



columella not twisted . . . . . . subperforata. 



1. Tornatellina novoseelandica, Pfeiffer, 1853. Plate 30, fig. 12. 



Tornatdlina novoseelandica, Ph., M.H. Viv., iii. 524; P.Z.S., 18.32 (1854). 

 149; Conch. Cab. (2), i, pt. 15, 149, pi. IS, f. 10, 11. Tornatdla novo- 

 seelandica, Pfr. : Hector, Cat. Land Moll. N.Z., 21. Tornatellina novo- 

 SRelandica, Ph., M.N.Z.M., 14 ; Nomencl. Hel. Viv., 342. T. neozelanica . 

 Pfr. : Button, T.N.Z.I., xvi, 191. T. novoseelandica, Ph. : Hedley and 

 Suter, P.L.S. N.S.W. (2), vii, <><iO : Suter, J. de Conch., xli, 236. Elas- 

 nin'inn Reclusiana, Gray, P.Z.S., 184!(, 1(57 ; not of Petit. 



Shell very small, oblongly turret ed, imperforate, thin, smooth, 

 shining, corneous. There is no sculpture except fine oblique somewhat 

 irregular growth-lines. Colour fulvous-horny. Spire high, turreted. 

 about 2J times the height of the aperture. Protoconch globose, the 

 nucleus flattish and somewhat oblique. Whorls 5|, convex, regularly 

 increasing, rounded at the base. Suture impressed, very narrowly 

 margined. Aperture subvertical, somewhat ear-shaped. Peristome thin, 

 acute. Outer lip broadly convex ; basal lip acutely rounded. Columella 

 strongly twisted, forming a prominent white callous fold, subtruncated 

 below ; parietal wall with a median moderate deeply entering fold. 



Diameter. 1-5 rnm. ; height, 3-5 mm. 



Animal unknown. 



Type in the British Museum. 



Hob. North Island : Whangarei Heads (C. Cooper) ; near Auck- 

 land (Greenwood. &c.) ; Thames (Adams) ; Hunua Range (Major 

 Broun) ; Waimarama. 



Very often found on fronds of Hymenophyllum. 



2. Tornatellina subperforata, Suter, 1909. Plate 30. fig. 13. 



Tornatellina subperforata, Sut., P. Mai. S., viii, 1909. 263, pi. 11, f. 30. 



Shell very small, conoidal, subperforate, thin, pellucid, shining, 

 light corneous. The only sculpture consists of fine oblique growth- 

 lines. Colour very light horny. Epidermis very thin, light brown, 



25 Moll. N.Z. 



