198 TURBO. 



prominent; penultimate and last whorl bearing numerous elevated 

 vaulted scales upon the lirne; aperture white or brownisli tinted 

 within, about half the length of the shell, round-ovate, angled above, 

 dilated and sub-channelled below ; columella thickened, somewhat 

 flattened and grooved below the narrow deeply perforating umbili- 

 cus. Alt. 90, diam. 70 mill. 



Seychelles; Ins. Reunion ; Ins. Annaa, Pacific O. 



Operculum (pi. 59, figs. 1,2,7,) flat inside with 5 whorls, nucleus 

 situated one-third the distance across the face ; outside convex, with 

 coarse obtuse granules, which are largest upon the higher part, nearly 

 surrounded by a marginal series of fine oblique wrinkles ; color 

 wdiite, more or less tinged with flesh color upon the outer half, and 

 with a narrow marginal orange line. 



The synonymy includes T. princeps Phil., T. lamarckii Phil., = 

 Delphinula turhinopsis Lam. ? (see next species) T. argenteus, Anton. 



A very variable species. I have seen many imperforate and sub- 

 perforate specimens otherwise typical in character. The lirse are 

 sometimes subequal and nearly smooth ; this form is the T. margarita- 

 ceus of Reeve, Fischer, and other authors. The margaritaceiis of 

 Linmeus seems to have been intermediate in character between the 

 smooth and spinose forms. 



Var. mar(;aritaceus (Linn.) Auct. PI. 45, fig. 100. 



Similar in form to T. argyrostovius ; lirse nearly or entirely smooth, 

 usually with riblets in the interstices except on the base. 



Var. CARDUUs Fischer. PI. 47, fig. 25. 



Differs from T. argyrostomus in the more conical form, less dilated 

 body-whorl, and imperforate umbilicus. Alt. 51 mill. 



Var. AURANTius Kiener. PI. 48, fig. 30. 



Shell imperforate, yellowish fulvous, whorls 6, convex, subcarinate, 

 longitudinally striate and spirally lirate, with unequal Vine, larger on 

 the median portion, and numbering about seven on the penultimate, 

 fifteen on the last whorl ; body-whorl with a sub-corOnal distantly 

 nodose liration. Alt. 43, diam. 38 mill. 



Habitat uukuorcn. 



Var. BicOLOR Sowerby, 1886. PI. 44, fig. 71. 



This form seems to me to be a synonym of T. vmrgnritacens. 

 Sowerby says of it : " In the only specimen I have met with of this 

 species, the broad brown oblique rays are very clearly defined upon 



