256 LEPTOTHYRA. 



Operculum calcareous with central nucleus ; outside subtly gran- 

 ulose, concave in the center, with two prominent concentric costse. 



A variety has the dark color replaced by scarlet ; the spiral 

 costse are articulated with white and scarlet. 



The above two descriptions are derived from the original ones of 

 C rosso. 



L. MACUL08A Pease, 1862. PL 57, fig. 60. 



''Shell small, globose, umbilicate, rather thin, shining, concentric- 

 ally irregularly ribbed, interstices grooved, concave, transversely 

 very faintly striate, white, ribsspotted remotely with rose red" (Pease'). 



Alt. 2, diam. IS mill. 



Ins. Paiimotus. 



To Pease's description of this lovely species, I would add that the 

 spire of adults is more obtuse than his figure, which I have copied, 

 indicates. The altitude is about equal to the diameter ; the subsut- 

 ural rib is frequently nodose ; and the umbilicus, as in the follow- 

 ing species, is crenated within the margin. It is most nearly allied 

 to L. picta Pse. 



L. CANDIDA Pease, 1860. PI. 63, fig. 40. 



"Shell minute, thin, perforate, orbicular, ornamented with raised 

 spiral striae (margins of upper whorls granose at the sutures?) inner 

 lip callous; aperture circular." (Pease). 



Sandwich Is. 



I have given Sowerby's miserable figure of this species. I have 

 not seen specimens ; and so inadequate a description does not deserve 

 recognition. 



L. PICTA Pease, 1868. PL 69, fig. 35. 



Shell small, solid, globose, umbilicate, concentrically ribbed ; spire 

 somewhat exserted; whorls angulated at their upper part ; aperture 

 circular; columella slightly callous; whitish, striped on the upper 

 part of the whorls longitudinally with reddish brown, below spotted. 

 (Peate). Alt, 3, diam. 2J mill. 



Ta h it i ; Paumotus. 



Operculum, pi. 60, fig. 63. 



The upper whorls of the spire are granulose above. There is con- 

 siderable variation in the prominence of the lirse on the central por- 

 tion of the body-whorl ; the margin of the umbilicus is more or less 

 plicate ; and the last whorl is slightly deflected toward the aperture. 



