TUBIOLA. 253 



primis contiguis, ultimo distincto, transversim costulatis ; costellis 

 subconfertis, sequidistantibus ; interstitiis tenuissime- longitudi- 

 naliter striatis; apertura circulari; peritremate continue Obs. 

 The figure is from a beautiful perfect specimen, picked up by Mr. 

 Cuming on the sands in one of the Philippine Islands. It is at 

 present unique in his unrivalled collection. 



2. cyclotina (pi. 255, f. 34), A. Ad. — Testa discoidea, orbicu- 

 laris, vix evoluta ; spira plana; anfractibus rotundatis, contiguis, 

 minute striatis, simplicibus; apertura circulari, expansiuscula ; 

 peritremate continuo. Obs. This species was picked up on the 

 sands at Kino-O-Sima, in Japan, by the author. It is not quite 

 perfect, but is very distinct from D. spirula. 



Subgenus Tobiola, A. Ad. 



Shell subevolute or loosely enrolled ; whorls rounded, simple, 

 concentrically striated; aperture subcircular; peritreme continuous; 

 margin acute, entire. Obs. This little group resembles somewhat 

 Daronia, but the texture and aspect more approximates the genus 

 Adeorbis. 



1. nivea (pi. 255, f. 35,36), Chemn. — Testa ovato-orbicularis, 

 nivea, tenuis, semipellucida ; spira depressa ; anfractibus rapide 

 crescentibus, convexiusculis, coucentrice creberrime liratis lineis- 

 que incrementi decussatis ; suturis profundis, subcanaliculatis ; 

 anfractu ultimo magno, antice dilatato, ad peripheriam rotundato, 

 ad peritrema contiguo ; apertura perobliqua, subcirculari, postice 

 angulata; peritremate continuo, simplici, acuto; umbilico per- 

 amplo, patulo, perspective Obs. This shell agrees exactly with 

 the original figure and description of Chemnitz's Turbo niveus. 

 The Delphinula nivea, Keeve, is the same as I), lavis, Kien., and 

 C. diatretum, Gould. 



2. cornuella (pi. 255, f. 37, 3S), A. Ad.— Testa subdiscoidea, 

 ovato-oblonga, tenuis, sordide alba, late umbilicata ; apice elato ; 

 anfractibus 3A, rapide accrescent! bus, rotundatis, ultimo ad peri- 

 trema soluto, striis incrementi ornato ; apertura pcrobliqua, trans- 

 versim ovata ; peritremate continuo, acuto, integro, dilatato. Obs. 

 In this species the whorls are disunited as in Daronia spirula, but 

 they are not rolled on the same plane as in that group. 



3. divisa (pi. 255, f. 39, 40), /. Adams. — Testa turbinate, 

 subevoluta, alba, tenuis, late umbilicata, infra spiraliter costellata ; 

 apertura magna, circulari. Obs. Shell "pure white, lower disk 

 spirally striated or costellated, aperture large and circular, um- 

 bilicus capacious." 



