250 LEPTOTHYRA. 



L. SANGARENSIS Schrenck, 1861. PL 47, figs. 27, 28 ; pi. 64, fig. 59. 



Shell small, turbinate- conic, almost trochiform, imperforate, solid, 

 dark purplish-brown or reddish ; sculpture consisting of fine crowd- 

 ed spiral concentric lirse on the base, which is very slightly convex, 

 and coarse cord-like lirse above, about five or six in number on the 

 body-whorl and with more or less minute lirulse between them : incre- 

 mental striulne visible under a lens ; spire elevated conic, subacute, the 

 apical whorl white ; suture deeply impressed ; whorls 4-5 ; last whorl 

 but slightly descending, subcarinate below the middle ; aperture 

 small, less than half the total length of shell, oblique, rounded, within 

 pearly, and iridescent; outer lip rather thin ; columella obliquely 

 arcuate, rather broad and flattened, very obtusely subtuberculate 

 just below the middle. Alt. 7, diam. 6 mill. 



Japan . 



T. coraUuius Reeve (pi. 63, fig. 20) is probably synonymous. 



Quite variable in its proportions, according to Schrenck, one of his 

 specimens measuring, alt. 7J, diam. 8 mill. 



This seems to be the shell which many authors have reported from 

 Japan as T. sanguineus L. From that species it differs in the conic 

 form, more finely lirate base, narrower ribs above, flatter base, etc. 

 From L. amussitata the lack of distinct decussation will separate 

 sangarensis. I was unfortunate enough to lose the only operculum 

 of this form in my possession, before describing it. 



L. AMUSSITATA Gould. PI. ^5, figs. 71, 72. 



Shell globose-conic, imperforate. solid, uniform deep crimson ; sut- 

 ures deeply impressed ; whorls 5, convex, spirally lirate, the lira? 

 large and prominent on middle portion of whorl, alternating with 

 smaller intercalated riblets ; base very finely concentrically striate, 

 the whole surface decussated by numerous regular oblique impress- 

 ed lines in the direction of incremental stria? ; last whorl descending 

 anteriorly ; aperture subcircular, oblique, less than half the length 

 of shell, silvery within; columella slightly tuberculate at base. 



Alt. 8-10, diam. 8-10 mill. 



Japan. 



Operculum (pi. 60, figs. 51, 52.) 



Collonia rubra A. Ad., mss. is a synonym according to Sowerby. 



A charming little shell, easily separated from its allies by the 

 finely decussated surface. 



