148 



one of which occurring on the lip causes a deep sinus in the 

 aperture. Long Bay. W. F. Petterd. 



No. 46. Cyclosteejia immaculata. n.s. C.t. parva, discoidea, 

 aupeme planata, alba, nndique con/ertim tenuissime undidose striata ; 

 anfr. 4, superne angidatis coronatis et radiatim costatis, infra rotundatis, 

 S carinis obsoletis granulosis instructis ; vmbilico peramplo, rnargine 

 eleganter dentato ; apertura orbiculari, dtntata. Diam. 3 mil. 



Shell small, discoid, flattened above, white, thickly, very 

 finely undulately striate all over; whorls 4, angular above, 

 coronate and radiately ribbed, rounded below, and furnished 

 with two rounded obsolete granular keels, umbilicus very 

 ample, with an elegantly dentate margin ; aperture orbicular, 

 toothed. Long Bay and Blackman's Bay. W. F. Petterd. 



No. 47. LiOTiA ixcERTA. U.S. L.t. raiiiuta diicoidea depressa, spira 

 omnino plana, tenui, opaca, mulique regulariicr ei tejiuiter spiraliter lirata, 

 profunde, late, persptctlct urnbilicata ; anfr. 4, biangulatis, regulariter et 

 distanter costatis ; costis eltvatis, sublamellosis et cucullatis ; liris supra 

 cost, transeunt. ; apertura tenui, integra, hand incrassafa ; basi convexa, 

 Diam. 5 mil. N.B. — Margaritacea, costis atate divisis, et rarius spinosis, 

 7iumerosis. 



Shell minute, discoid, depressed, spire quite flattened, thin, 

 opaque, regularly and finely lirate all over, deeply, widely, 

 perspectively umbilicate : whorls 4, biangulate, regularly and 

 distantly ribbed, ribs raised, sublamellose, and, as it were, 

 hooded ; lirse passing over the ribs, aperture thin, entire, not 

 thickened, base convex. Long Bay. Eev. H. D. Atkinson. 

 Obs. The transverse ribs divide in this shell as it grows older, 

 and sometimes are even covered with numerous spines. It 

 is also nacreous, which makes its generic position very doubt- 

 ful, especially as the mouth is not thickened. I only pro- 

 visionally class it as a Liotia. 



No. 48. Fos.SARUS tasmanicus. n.s. F.t. parva, depi'essa, sub- 

 orbiculata, anguste urnbilicata, solidiuscula, pallide lutea, carinis spiralibus 

 et liris obliquiis tindique conspicue clathrata ; carinis elevatis, rotundatis ; 

 liris, sublamellosis regularibus, subdistantibus ; anfr. 5 angulatis, inter 

 carin. quasi canaliculatis ; sutura canalicidata ; apertura orbiculata, intus 

 Icevi ; labio vix rejlexo. Diam. 2 mil. 



Shell small, depressed suborbiculate, narrowly umbilicate, 

 rather solid, pale yellow, latticed all over with spiral keels 

 and oblique lirae, keels raised, roxmded, lirae sublammellose 

 regular, subdistant ; whorls 5, angular, canaliculate between 

 the keels, suture canaliculate, aperture orbicular, smooth 

 within, lip scarcely reflected. Long Bay, Rev. H. D. Atkinson; 

 Blackman's Bay, W. F. Petterd. This shell has characters 

 intermediate between the genera JEuchehis and Vanikoro, but 

 I think belongs more completely to the genus in which I have 

 placed it. 



No. 49. FossARUS BTTLIMOIDES. U.S. F.t. minida, ovata, suhumbilicata, 

 tenui, alba, subpellucida, nndique tenuiter regulariter lirata, tranaver. 



