326 PROCEEDINGS OF THK MALACOLOGICAL SOCIETY. 



LiAKDETiA, nov. gen. 



Shell small, troclioid, tliiu, finely but distinctly costulate, periphery 

 carinated. 



Type : Nanina Clayi, Liardet. 



Three further species (Nouleti, Pfeijferi, and Otarte) I am likewise 

 unable to classify with any other Pacific shells. One of these, Pfeijferi, 

 has indeed been referred by von Martens to the genus Eurypus of 

 Semper' — Eurypus being preoccupied, Mr. Sykes has substituted 

 Frelum for Semper's name — but I am unable to concur in this view, 

 seeing that this species and its allies are widely different from Casca, 

 the type of that genus. More recently Mr. Sykes " has ])laced some 

 Norfolk Island species in Frettim, which, however, likewise bear no 

 resemblance to its type, and may in fact constitute another new 

 genus, but these will, I hope, be dealt with on another occasion. 

 For the reception of the tliree before-mentioned species I now 

 propose — 



Irenella.^ nov. gen. 



Shell imperforate, turbinate or depressed conoid, solid, livid purplish, 

 shining, smooth or striated and decussated with spirals. 



Type : Helix Nouleti^ Le Guillou. 



Fretum lepidum, n.sp. Tl. XIV, Figs. Za-c. 



Shell perforate, turbinate, shining, dark fuscous above, milky 

 white below, or entirely milky white; spire depressed, apex obtuse, 

 suture channelled ; whorls 4, rounded, very finely striated trans- 

 versely and spirally, the strite being perceptible only with a strong 

 lens; aperture rotundate, margins acute, regularly curved; columellar 

 margin reflected, practically covering the narrow perforation of the 

 umbilicus, and furnished inside witli a slightly entering callous fold, 

 not equally developed in all specimens. Diam. maj. 9, min. 8 mm.; 

 alt. 5'5 mm. 



Hob. — Island of Ngau, under dead leaves and logs. October, 1855. 

 (J. MacGillivray.) Six specimens. 



Type in the British Museum. 



Allied to nodidala, Mouss., but, while possessing only four whorls, 

 it is nearly twice as large as that species, which has six whorls. 



Fretum tlacitum, n.sp. PL XIV, Figs. \a-c. 

 Shell narrowly perforate, conoid; spire depressed, apex obtuse, 

 suture channelled ; whorls 4, increasing rapidly, last more than 

 twice as wide as the penultimate, slightly dilated towards the 

 aperture, a little rounded above, angulated above the periphery, 

 the angle disappearing towards the aperture, inflated below ; smooth, 

 shining, finely striated; aperture oblique, crescent-shaped, margins 

 acute, regularly curved ; columellar margin reflected and almost 

 covering tlie narrow perforation of the umbilicus. Type whitish 



1 Monatsber. Berlin Akad., 1877, p. 268. 



"^ Proc. Malac. Soc Lond., vol. iv, p. 140, 1900. 



^ tlp-rjvTi, ' peace,' to convey the idea of the locality : Pacific Ocean. 



