230 GIBBULA. 



G. AFFINIS Garrett. PI. 40, figs. 6, 7. 



Shell small, narrowly umbilicate, conoidal, rather solid, lusterless, 

 cinereous, encircled by spiral series of small brown or slate colored 

 subquadrate spots ; spire conical, apex whitish, acute, sutures slightly 

 impressed, not canaliculate ; whorls 5, slightly convex, the last sub- 

 carinate at periphery ; surface all over very minutely densely 

 spirally striate, and more or less decussated by growth-lines ; with 

 about 5 larger somewhat granose ridges on the penultimate, 12 

 or more on the last whorl ; body-whorl slightly descending anteriorly ; 

 aperture rounded-quadrangular, iridescent and sulcate within ; basal 

 margin finely crenulate; columella straight in the middle; umbili- 

 cus bounded by a coarsely plicate rib, whitish and strongly spirally 

 grooved within. 



Alt. 5-5*, diam, 6 mill. Diam. of umbilicus, 1 mill. 



Viti and Samoa Is. 



G. affinis GARRETT, Proc. Cal. Acad. Sci. iv, p. 201 (1872). 



My description and figure are drawn from specimens received 

 from GARRETT. 



G. CONCINNA Dunker. PI. 40, figs. 8, 9. 



Shell small, globose-depressed-conical, narrowly umbilicate, solid, 

 lusterless, soiled whitish or yellowish, with either a series of dark 

 flammules below the sutures, the base faintly articulated with dark, 

 or else the entire surface mottled, nearly covered with blackish. 

 The body-whorl is obtusely subangular, and descends a trifle 

 anteriorly; the sutures are narrowly but decidedly impressed ; the 

 penultimate whorl has 7 or 8 equal strong spiral lirae, as wide as 

 the interstices, which are densely obliquely striate and have usually 

 a few indistinct spiral striae. The base has about 10 concentric 

 lirulse. Aperture rounded, very oblique, thickened with opaque 

 white within, its edge crenulated ; umbilicus narrow, bounded by 

 an indistinctly crenulated rib, strongly grooved within. 



Alt. 4, diam. 5 to 6 mill. ; diam. of umbilicus, \ mill. 



Samoa Is. ; Upolu. 



The upper one or two lirse are more or less beaded, and sometimes 

 all of them are. The interstices are sometimes wider than the lirse, 

 and have numerous quite distinct spiral striae. The species differs 

 from G. affinis Garrett in having subequal line, and a narrower um- 

 bilicus, scarcely exceeding J mill, in width. I have been unable to 

 find any description of this shell ; it is mentioned in Museum God- 



