202 TURBO. 



upper angle sometimes separated from body-whorl, and projecting, 

 l)ase rounded, columella excavated at umbilicus. Alt. 40-50 mill. 



Xew Cahdoma ; Sandwich Is. 



Operculum circular, with 5 whorls ; outside granulose, green or 

 olivaceous at centre, yellowish at margins. 



.Sculpture less sharp than in the following form, and color greener. 



The synonyms are T. disjiuictus Anton, T. concinnus Phil., and 

 T. articulatus Reeve, (pi. 4.5, fig. 98) T. elegans Phil., =; T. radiatus 

 Rve., (pi. 46, figs. 5, 6) is a form somewhat intermediate between 

 typical intereostalis and tlcaoniciis Reeve. 



T. TicAONicus Reeve, 1848. PI. 47, fig. 22 ; pi. 4.3, fig. 51. 



Shell ovate-conic, perforate, solid, dirty white or greenish, radiate- 

 ly flammulate above and maculate below Avith black or brown ; 

 whorls 6, convex, slightly flattened below the subcanaliculate sut- 

 ures, sometimes subcarinate, spirally sculptured with inequal lirse, 

 the intervening furrows sharjily squamose with striee of increment; 

 aperture round, produced into a projecting angle posteriorly and 

 frequently disconnected from the body-whorl, white and pearly with- 

 in, rounded or slightly produced below; outer lip crenulate, colu- 

 mellar arched, excavated at the narrow umbilicus, which is some- 

 times subimperforate. Alt. 50-60 mill. 

 Philippines; New Caledonia; Seychelles ; Madagascar; Singapore, etc. 



Operculum (pi. 60, fig. 47, 49,) with four whorls and subcentral nu- 

 cleus ; outside very convex, deep green, olive or brownish in the 

 centre, lighter toward the margins, all over except side of increment 

 finely granulose, and with a radial sulcus marking the limit of the 

 margin of increment. The prominent character of the operculum 

 in this species, as well as in T. foliaceus etc., is the manner in which 

 the outer layer of calcareus matter overlies tlie granulose surface 

 below, with an obvious sulcus at their junction. PI. 60, fig. 38, is 

 the operculum of the form known as T. tiimidubis Rve. 



The following are synonyms: T. radiatus Kiener (in part), T. 

 tumidiilus Reeve. This species is closely related to T. intereostalis 

 Mke., but differs in color, in tlue greater prominence of the ribs, and 

 in the operculum. My description and figure of the operculum of 

 ticaonicHS are drawn from alcoholic specimens containing the animal. 

 T. foliaceus Phil, is also allied, and has similar operculum, but has 

 much more conspicuous incremental lamella?. The umbilicus is in- 

 differently perforate or closed, sometimes rather wide, and the 

 variation in sculpture is considerable. T. jmlcJier Reeve is separated 

 from this species principally because, according to Sowerby, its oper- 

 culum is different. I suspect however that he is mistaken in this, 

 and that it will prove to l)e the same; pulcher is the prior name. 



