174 PROCEEDINGS OF THE SCIENTIFIC ASSOCIATION. 
tudinally striate ; hinge-teeth numerous, chevron-shaped, 
■widely interrupted beneath the umbo by a large hinge-pit. 
Pliocene, Matura. As Z. elurnea? in my list of 1864. 
Leda illecta n. sp. 
Smooth, ovate-transverse, inequilateral, somewhat tumid 
on the central portion, posterior end produced into a ros- 
trum which is almost curved upwards; hinge-line some- 
what deflected upwards and interrupted at the umbo ; um- 
bones approximated, scarcely prominent beyond the hinge- 
line ; posterior cardinal area broad, smooth and ill-defined. 
Lower Miocene, Manzanilla. This species also resembles 
Z. eburnea Sow., 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 I have 
been able to find, it is somewhat difficult to exhibit clearly 
the differences in words. From the pliocene species Z. 
jperlepida it may be distinguished by its greater length and 
compressed rostrum. 
Nucula baccata n. sp. 
Subovate, inequilateral, a little produced posteriorly, orna- 
mented by minute concentric ribs which are decussate by 
still finer radiating strife ; anterior and posterior ends an- 
gulate, interior pearl-shining; hinge-teeth slightly bent, 
divided by a very oblique hinge-pit ; margins dentate. 
Pliocene, Matura. As N. si mil is in my previous list; a j 
species which it strongly resembles. 
Nucula vieta n. sp. 
Subequilateral, obliquely suborbicular, slightly produced 
posteriorly with regular rounded concentric ribs ; posterior li 
side very obliquely descending, posterior teeth straight, an- 
,jg: 
