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tudinally striate ; hinge-teeth numerous, chevron-shaped, 

 widely interrupted beneath the umbo by a large hinge-pit. 

 Pliocene, Matura. As L. eburnea f in my list of 1864. 



Lcda 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 ; urn- 

 bones approximated, scarcely prominent beyond the hinge- 

 line ; posterior cardinal area broad, smooth and ill-defined. 



Lower Miocene, Manzanilla. This species also resembles 

 L. 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 L. 

 perlepida 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 striae ; 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. similis in my previous list ; a 

 species which it strongly resembles. 



Nucula vieta n. sp. 



Subequilateral, obliquely suborbicular, slightly produced 

 posteriorly with regular rounded concentric ribs ; posterior 

 side very obliquely descending, posterior teeth straight, an- 



