64 SCURRIA. 



Var. PUNCTATISSIMA Philippi. PL 4, figs. 71, 72, 73. 



Shell ovate-elliptical, somewhat depressed, obsoletely sculptured 

 with about 20 riblets and impressed radiating lines ; white, minutely 

 tessellated with impressed brown dots ; apex at the front third of 

 the length, eroded. Inside brown, maculated with black in the 

 cavity ; border wide, white, articulated with black ; margin very 

 finely crenulated. Length 14, width 11J, alt. 4 mill. 



Like leucophcea in size and^orm, but differing in sculpture and 

 coloration. The form is elliptical, a little narrower in front. Of 

 ribs one sees only weak indications, and'shallow furrows only toward 

 the margin. The rest of the outside is decorated with little brown 

 impressed dots very regularly arranged in bands, and looking very 

 pretty on the white ground. There are besides inconspicuous brown 

 rays. The border inside is 1 to 1J mill. wide. (Phil.) 



Chili 



S. MESOLEUCA Menke. PI. 8, figs. 96-100, 1, 2; PL 33, figs. 83, 



84, 85. 



Shell extremely variable in color and markings, but generally 

 rather broad and flat, with the apex somewhat inclined anteriorly, 

 especially in the young shell. Outside with the apex and sometimes 

 with a considerable portion of the shell nearly smooth ; generally 

 with extremely fine ribs, sometimes sharp, sometimes rounded, gener- 

 ally slightly granulose ; sometimes with broad strong ribs; some- 

 times nearly smooth with radiating lines of granules. Sometimes 

 intercalary ribs are found, much larger than the rest ; sometimes dif- 

 ferent plans of sculpture are seen on the same shell. The color out- 

 side is generally olive or brownish-green ; sometimes without mark- 

 ing, generally with white lines either radiating or broken Tip ; often 

 with white patches tesselating with the brown ; or changing from 

 one pattern to another. Inside, the shell is generally whitish 

 about the middle, (whence the name) with more or less of a bluish- 

 green tinge, sometimes dark-green, sometimes brownish, sometimes 

 with an element of ochre-yellow more or less mottled. There is 

 almost always a large dark spot at the body mark, of a brownish- 

 olive green, in which sometimes the brown, sometimes the dark- 

 green predominates. The body stain is irregularly and slightly 

 gathered into points ; the head mark is generally shown by a stain 

 shaped like a sector, bounded by two radii from the apex, about 70 

 apart. The margin is generally broad, occasionally very narrow, 



