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Trochus plicomphahis n. sp. 



Topshaped, deeply perforated by a small circular umbilicus, 

 zoned with many spiral granular lines, aperture subquad- 

 rate, columella straight, thickened ; base with many (10 — 20) 

 moniliform rows of granules, umbilicus deep, its margins 

 dentate. 



Pliocene, Matura. It resembles T. ziziphinus in shape, 

 but is devoid of any keel on the whorls. 



Vitrinella marginata n. sp. 



Orbicular, umbilicate, discoidal, few-whorled, minutely spi- 

 rally striate ; outer margin with about four small articulated 

 keels not visible from above, the outer one forming the 

 periphery ; whorls somewhat convex above, spire raised, 

 ornamented with articulated radiating striae ; aperture 

 nearly circular, rather oblique. 



Pliocene, Matura. A most elegant little shell. 



Donax fabagelloides n. sp. 



Transversely oblong, somewhat triangular, subequilateral, 

 anterior and posterior angles rounded ; zoned with broad 

 dark bands, and finely radiately striate ; margins crenate- 

 dentate. 



Pliocene, Matura. Remarkable for its resemblance to 

 D. fabagella, under which name it appeared in my list of 

 1864. It is more equilateral than that species, and not so 

 high relatively to its length. 



Leda perlepida n. sp. 



Transversely oval, subinequilateral, moderately convex, 

 with numerous fine concentric striae, and occasionally deeper 

 and wider concentric furrows ; posterior end acutely ros- 

 trate ; lunule none ; dorsal area elongate-lanceolate, longi- 



