GUPPY — TERTIARY FOSSILS OF THE WEST INDIES. 173 
Trochus plicomphalus 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 deyoid of any ke9l 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 strise ; aperture 
nearly circular, rather oblique. 
Pliocene, Matura. A most elegant little shell. 
Donax falagelloides 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. Kemarkable for its resemblance to 
D. falagella , 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 strise, and occasionally deeper 
and wider concentric furrows ; posterior end acutely ros- 
trate ; lunule none ; dorsal area elongate-lanceolate, longi- 
