147 



red smooth sliininc; appearance renders it extremely like a 



Rotella, but it has an umbilicus. 



No. 41. Cyci.ostrema josephi. C'.t. parea, oblique turbinata, crassa, 

 late iimhiUcata, alba, ojxica, pallklistilmr cantanea maculata ; anfr. 5, 

 roliindat'ni, creberrhne concinne Mriafls ; SKfiira impressa, apertura 

 orbicnlata, labro crasao, jwnticc jiroducto, cohnnella obliqua, basi rotunda, 

 umbilico obliijiw ,^tria(o. Long. .S, lat. 3, mil. 



Shell small, obliquely turbinate, thiclc, widely umbilicate, 

 white, opaque, spotted with very pale chestnut ; whorls 5, 

 rounded, very closely and neatly striate, suture impressed, 

 aperture orbiculate, lip thick, produced' posteriorly, columella 

 oblique, base round, umbilicus obliquely striate. Blackman's 

 Bay. W. F. Petterd. 



No. 42. Cyclcstrema mtcra. 7i.s. C.t. minnta, turbinata, alba, 

 polita, lari, per.-<pecfive vmbilicata ; anfr. 5, exacte rotundata, apertiira 

 gimplici, orbiculata, acuta, liaud reflexa. Diam. \h mil., Long Bay. Rev. 

 H. D. Atkinson. 



Shell minute, turbinate,white, polished, smooth, perspectively 

 umbilicate, whorls 5, exactly rounded, aperture simple, orbicu- 

 late, acute, not reflected. 



No. 43. Cyclcstrema weldii. -n.s. C.t. depret<i^o-turbinata, minima, 

 albida, nubilinji/inna, tenui ; nifente, vmbilicato ; anfrac. G, depressis, 

 convexis, Uevibwi ; apertura, orbiculata, posticc subeversa ; umbilico 

 mar(jinato. Diam. mag. 2. alt. 2 mil. 



Shell depressed turbinate, minute, whitish, somewhat 

 translucent, thin, shining, umbilicate; whorls 6, depressed 

 convex, smooth (though there are f\iint traces of transverse 

 striae, probably lines of growth) : aperture orbicular, some- 

 what everted posteriorly, vmabilicus marginate. Long Bay, 

 20 fathoms. Kev. H. D." Atkinson. 



No. 44. Cy'clostrema susonis. n.s. C.t. minnta, orbiculari, de- 

 pressa, alba, pjolita ; anfr. 4, rotuTulatis ; spira jMriim, exserta, trans- 

 lucente ; apertura simplici, orbiculata, vmbilico amplo, hand marginato. 

 Diam. Ih mil. 



Shell minute, orbicular, depressed, white, polished, whorls 

 4, rounded, spire slightly exserted, translucent, aperture 

 simple, orbicular, umbilicus ample, not marginate. N. Coast, 

 E. Gunn ; and Blackman's Bay, W. F. Petterd. Obs. 

 Minute, much smaller than the preceding, with fewer whorls, 

 and perfectly devoid of ornament. 



No. 45. Cyclo.strem.\ spixosa. n.s. C.t. miniUa discoidea, supeme 

 planata vel concava, alba, umiique obsolete radiatim striata ; anfr. 4» 

 supeme acute amjulatk, Jimbriatis et .<ipinis coronatis ; infra rotundatis et 

 con-ffiicue imicarinatis ; .spinis trianf/ulafis, larnellosis, concavis ; umbilico 

 peramplo ; apertura rotundata postice conspicue sinuata. Diam. 2 to 3 

 mil. 



A minute shell, flattened above and unicarinate beneath, 

 easily distinguished by its crown of hollow triangular spines, 



