Fretum.] GASTROPODA. 619 



tions of calciferous gland very small ; flagellum short ; no mucous 

 'lands. Shell helieiform, narrowly umbilicated, whorls smooth, the 



O * 



last indistinctly angled. 



Distribution. The type is from the Fiji Islands ; a few species 

 are recorded from the Solomon Islands, and three from Norfolk and 

 Phillip Islands. 



1. Fretum novarse, Pfeiffer, 1862. Plate 25, figs. 1, la, Ib. 



Helix novarce, Pfr., Mai. BL, viii, 1862, 148 ; M.H. Viv., v, 169 ; Hector, 

 Cat, Land Moll. N.Z., 1873, 13. Hyalina novarce, Pfr. : Hutton, 

 M.N.Z.M., 13 ; T.N.Z.I., xvi, 205. Flammulina novarce, Pfr. : Hedley 

 and Suter, P.L.S. N.S.W. (2), vii, 644. Ariophanta novarce, Pfr. : Suter, 

 J. de Conch., xli, 283. Xesta novarce, Pfr., Index, 65. 



Shell orbicular, depressed, narrowly umbilicated, thin, pellucid, 

 somewhat shining. The only sculpture is formed by fine growth- 

 striae, more pronounced at the suture. Colour pale yellowish-horny. 

 /:/iidermis thin, slightly opaque. Spire conoidal, about half the height 

 of the aperture. Protoconch flatly convex, of 1J smooth whorls. 

 \\'horls 4f, rather convex, gradually increasing, the last depressed, 

 not descending, faintly angled at the periphery ; base flatly rounded. 

 Suture scarcely impressed, narrowly margined below. Aperture slightly 

 oblique, lunar, broader than high. Perisionre simple, straight, margins 

 subconvergmg. Columella short, arcuate, above shortly expanded. 

 Umbilicus narrow, open. 



Diameter Maj., 6 mm. ; min., 5^ mm. : height, 2| mm. (type of 

 4 whorls). Diameter Maj., 7i mm. ; min.. 6| mm. : height, 4mm. 

 (specimen of 4f whorls). 



Animal with a very distinct tail-gland ; foot tripartite. 



Detititi (Suter. T.N.Z.I.. xxvi, 130, pi. 18, f. 26, 27).-- Jaw mem- 

 branaceous, smooth, lower margin with an indistinct median projec- 

 tion. Formula of radula 42+1 + 42, of which 10 to 20 are laterals. 

 Central tooth long and narrow, unicuspidate ; laterals unicuspidate, 

 cutting-point broad, blunt ; marginals sinuate, bicuspid. 



Type in the K.K. Hofmuseum, Vienna. 



Hab. Bay of Islands, type (Hochstetter) ; near Lake St. John, 

 Auckland (Musson). 



Refnark. The margination of the suture is in some specimens 

 almost obsolete. 



Fam. LIM ACIDISE, Gray. 



Animal elongated, semicylindrical ; head retractile ; oculiferous 

 tentacles moderate, anterior tentacles short, club-shaped. Mantle 

 shield-like, on the anterior and upper portion of the body ; orifice 

 of respiratory sac at the lower part of the mantle, on the right side. 

 Excretory and reproductive apertures on the right side. Foot with or 

 without a posterior mucous gland. Jaw arcuate, without vertical 

 ribs ; cutting-edge with a median projection. Central tooth of radula 



