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tudiually striate ; hinge-teeth numerous, chevron-shaped, 
widely interrupted beneath the umbo by a large hinge-pit. 
Pliocene, Matura. As L. cbuniea f in m3’ list of 1864. 
Lcda illecta n. sp. 
Smooth, ov’ate- transverse, inequilateral, somewhat tumid 
on the central portion, posterior end produced into a ros- 
trum which is almost curv’ed upwards ; hinge-line some- 
what deflected upwards and interrupted at the umbo ; um- 
bones approximated, .scarcel}’ promiuent be3’ond the hinge- 
line ; posterior cardinal area broad, smooth and ill-defined. 
Lower Miocene, Manzauilla. This species also resembles 
L. ebuniea^o'ix., but the rostrated posterior end is longer and 
more curved. It is allied to several recent and fossil spe- 
cies, but although it cannot be identified with any 1 have 
been able to find, it is somewhat difficult to exhibit clear^’ 
the differences in words. From the pliocene species L. 
perlepida it ma3’ be distinguished b}’ its greater length and 
compressed rostrum. 
Nucida baccaia n. sp. 
Subovate, inequilateral, a little produced posteriori}’, orna- 
mented by minute concentric ribs which are decussate b}’ 
■Still finer radiating striae ; anterior and posterior ends an- 
g’lilate, interior pearl-shining ; hinge- teeth slightl}" bent, 
divided b}’ a ver}’ oblique hinge-pit ; margins dentate. 
Pliocene, Matura. As A^. similis in m3' previous list ; a 
species which it strongl}' resembles. 
A^uatla vieta u. sp. 
Subequilateral, obliquel}' suborbicular, slightly produced 
posteriorly with regular rounded concentric ribs ; posterior 
side very obliquel}’ descending, posterior teeth .straight, an- 
