Bulletin 35 
aoo 
Page 173 
Trochus plicomphalus n. sp. 
Topsliaped, deepl)' perforated by a small circular umbilicus, 
zoned with many spiral granular lines, aperture subquad- 
rate, columella straight, thickened ; base with manj- (10 — 20) 
moniliform rows of granules, umbilicus deep, its margins 
dentate. 
Pliocene, Matura. It resembles T. ziziphinus in shape, 
but is dev'oid of any keel on the whorls. 
Vitrinella marginata n. sp. 
Orbicular, umbilicate, discoidal, few-whorled, minutely spi- 
ral!}’ .striate ; outer margin with about four small articulated 
keels not msible from above, the outer one forming the 
periphery ; whorls somewhat convex above, spire raised, 
ornamented with articulated radiating striae ; ai^erture 
nearly circular, rather oblique. 
Pliocene, Matura. A most elegant little shell. 
Donax fabagclloides 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. 
Transv’ersely 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- 
