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Bulletin 35 



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Page 171 



like a Solenel/a, and it partakes indeed of some of the 

 characters of that genus, as well as of Nucula and Leda, and 

 were it rostrated it would be referred to the latter. It is 

 quite of a different type to the Nuculas which follow, and to 



those like N. nucleus. 



3. Nucula vieta Guppy (PI. vii., f. n). 



Proc. Scientific Assoc. Trinidad, 1867, p. 174. 



Geological Magazine, 1874, pi. xviii., f. 8. 



A Nucula of obliquely subtriangular form, like N. proximo, 

 and N. mixta, with regular round concentric ribs. Small 

 specimens only have occurred in the Pliocene of Trinidad, 

 but it would not be surprising if it proved to be also a recent 

 shell attaining greater dimensions than those we have seen, 

 the largest of which are 3%' mill, in height and 3 mill, in 

 breadth. 



4. Ahicula baccata , Guppy (PI. vii, f. 12). 



Proc. Scientific Assoc. Trinidad, 1867, p. 174. 



Geological Magazine, 1874, PI. xviii., f. 7. 



A Nucula of the group of N. obliqiia and N. similis, some- 

 what similar in style to N. vieta, but distinguished by its less 

 triangular form, greater size, and almost smooth surface. 

 The margins of both species are crenulate. N. baccata has 

 only hitherto been found in the Pliocene of Trinidad. Our 

 specimens measure 7 mill, in breadth, and 5^ mill, in height. 

 As nearh' all the shells of living species found in the Pliocene 

 (Matura) beds of Trinidad are smaller than their living repre- 

 sentatives, it may be anticipated that if any of those now 

 known only as fossils are discovered to be living, the recent 

 examples will be of larger size. 



