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like a Solenella, aud 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 t\'pe to the Nuculas which follow, and to 
those like N. jiiicleiis. 
3. Nucula vieta Guppy (PI. vii., f. ii). 
Proc. Scientific Assoc. Trinidad, 1867, p. 174. 
Geological Magazine, 1874, pi. xviii., f. 8. 
A Nucula of obliquely subtriangular form, like N. proxima 
and N. mixta, with regular round concentric ribs. Small 
specimens onh- 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. Nucula baccata, Gupp5' (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. obliqua and N. shnilis, some- 
what .similar in .stj le to iV. vieta, but di.stinguished by its less 
triangular form, greater size, and almost smooth surface. 
The margins of both species are crenulate. A^. baccata has 
onl}' hitherto been found in the Pliocene of Trinidad. Our 
specimens measure 7 mill, in breadth, and 53^ mill, in height. 
.\s nearly 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 onl}- as fossils are discovered to be living, the recent 
examjdes will be of larger size. 
