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DESCRIPTION OF A NEW SPECIES OF GALLIOSTOMA FROM 



SOUTH FORMOSA. 



By Edgar A. Smith, I.S.O. 



Read 9th November, 1906. 



Calliostoma formosensis. 



Testa elate et acute conica, ad peripheriani acute angulata, 



seriebus pluribus granuloruni spiralibus (duobus supra suturam 



caeteris majoribus) oriuita, alba, rufo maculata ; spira alta, fere 



coucave conica ; anfractus circiter 9 plani, ultimus infra planiusculus, 



concentrice tenuiter granulato - liratus, circa regionem umbilicalem 



impressam callo albo marginatus ; apertura rhomboidalis ; columella 



incrassata, albo-margaritacea, obliciua ; labrum tenue, iutus tenuiter 



sulcatum. Diam. maj. 42, min. 35 mm. ; alt. 35 mm. 



A very beautiful species, well characterized by the style of 

 sculpture, its form, and coloration. It does not compare at all 

 closely with any other species. The series of granules on the body- 

 whorl above the periphery are alternately larger and smaller, the 



latter upon the preceding whorl becoming merely fine lirae without 

 gi-anulation. There are about ten rows upon the last whorl besides 

 the two more prominent rows at the periphery which form a con- 

 spicuous belt above the suture. This is marked with reddish blotches 

 which are rather equidistant, and the rest of the surface of the spire 

 is also more faintly stained with red, but chiefly upon the rows of 

 granules, and not in the interstices. The blotches upon the periphery 

 are also visible on the underside of the whorl, which is whitish, 

 excepting some of the series of granules around the central part, which 

 are reddish. These are farther apart and more coarsely granose than 

 those towards the circumference. Altogether there are about twenty 

 rows. There is a faint umbilical depression bordered by a thickish 

 white ridge. The outer lip is thin, oblique above, and shallowly 

 sinuated at the base. The lines of growth are more conspicuous upon 

 the base than upon the spire. 



