FREE INSTITUTE OF SCIENCE 



TERTIARY FAUNA OF FLORIDA 



1385 



Phacoides ( Parvilucina ; intensus n. sp. 

 PLATE 50. FIGURE 8. 



Pliocene of San Diego, California, from a depth of one hundred and sixty 

 feet below the surface in the City Park well ; Hemphill. 



Shell small, resembling P. tenuisculptus Cpr., but with the concentric sculp- 

 ture much sharper though very fine, the radials feeble, the lunule large, lan- 

 ceolate, and impressed, the beaks small and prominent, the hinge very delicate, 

 the posterior dorsal area with a wide, shallow sulcus, and the inner margins 

 rather coarsely crenulate. Alt. 4.5, Ion. 5.0, diam. 3.0 mm. 



Only three valves of this form were obtained, but it seems to be distinct, 

 though an evident precursor of P. tenuisculptus. 



Phacoides (Bellucina) actinus n. sp. 

 PLATE 52, FIGURE 3. 



Oligocene marl of Bowden, Jamaica ; Henderson and Simpson. 



Shell small, plump, somewhat inequilateral, with moderately prominent, 

 slightly decurved beaks ; anterior end longer and more inflated ; lunule lan- 

 ceolate, somewhat longer and narrower in the right valve, distinctly impressed ; 

 escutcheon impressed, almost linear ; disk with sixteen to eighteen rounded 

 radial ribs, entire and wider towards the base, with narrower deep interspaces ; 

 concentric sculpture of thin lamellae, with much wider interspaces, which are 

 somewhat crenulated or waved by overriding the ribs and dipping into the 

 radial interspaces ; dorsal areas large, slightly impressed, with no radial sculp- 

 ture, the concentric lamellae on the posterior area close-set, low, but on the 

 bounding rib and on a radial line near the dorsal margin slightly elevated ; hinge 

 normal, delicate, internal margins minutely crenulate. Alt. 4.5, Ion. 4.6, diam. 

 3.0 mm. 



This little shell is near the typical Panilucina, but begins to show the Bel- 

 lucina characteristics in its sculpture, which in species of later horizons we find 

 fully developed. The chief variations are in outline, some being rounder or 

 higher and shorter than other specimens. 



Phacoides (Bellucina) Tuomeyi n. sp. 



PLATE 52, FIGURE i. 



Lucina costata Tuomey and Holmes, Pleioc. Fos. S. Car., p. 60. pi. xviii., figs. 12, 13, 1855. 

 Not L. costata Orbigny. 1846, nor of Holmes. 1860. nor of Gabb, 1873. 



Miocene of North Carolina at the Natural Well and Magnolia, Duplin 

 County ; and of South Carolina at Black River ; Holmes. 



