OF CONCnOLOGY. 



225 



which appear to be formed by the abrasure of the epidermis ; 

 apex brownish purple. 



Var. ; pale straw color or light reddish brown. 



Observations. — Allied to P. filosa, Pfr., inhabiting the Samoa 

 Islands. Classed by Mr. Reeve as var. of Otaheitana. Con. 

 Icon., fig. lie. 



Realia costata, Pease. 



Description. — T, ovato-turrita, umbilicata, longitudinaliter 

 costata, costis ad anfr. ultimum obsoletis ; anfr. 6, rotundatis, 

 suturis profundis ; perist continuo, vix everso, anfr. penultimo 

 disjuncto ; apertura rotundato-ovata, intus aurantia ; albida vel 

 dilute cornea. 



Dimensions. — Long. 6, diam. 3 J mill. 



Habitat. — Tahaa. 



Shell ovately-turrited, umbilicate, longitudinally ribbed, ribs 

 becoming obsolete on the last whorl; whorls 6, rounded, sutures 

 deep ; peristome continuous, slightly everted, not joining the 

 penultimate whorl ; aperture roundly ovate, orange color within. 

 Color white nr light horn color. 



Remarks. — The above species, together with R. Tahitensis, 

 Pease, and scalarifoi'mis, Pease, differ from all other species of 

 the genus, in being prominently ribbed. 



We proposed to unite them under the generic name of Scali- 

 nella. They present the following characters : — Scalariform 

 in shape, the forms being rounded and separated by a deep 

 suture ; peristome continuous, disconnected from the penultimate 

 whorl, and somewhat porrected ; longitudinally strongly ribbed. 



The operculum is of the Realia form. 



Realia elongata, Pease. 



Descriptimi. — T. elongata, turrita, solida, umbilicata ; anfr. 7, 

 convexis, ad marginibus vix rotundato-angulatis ; circum umbili- 

 cum rotundata ; suturis valde impressis ; spira efevata, acuta ; 

 apertura rotundato-ovata, intus crocea, vel aurantia ; perist 

 continuo, vix everso, anfr. penultimo adnato ; albida, aut pallida 

 rosacea. 



Dimensions. — Long. 10 J, diam. 4 mill. 



Habitat. — Raiatea. 



Shell elongate, turrited, solid, umbilicate, rounded at umbilical 

 region ; whorls 7, convex, somewhat roundly angulate at their 



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