367 Dominican Fossils — Maury 203 



Genus Myrt^a Turton 



Myrtcea lomasdesamba, n. sp. 

 Plate 35, Figure 3 



Shell small, thin and delicate, greatly depressed, orbicular; 

 slightly resembling M. limoniana Dall, from Bowden but more 

 circular in outline, with the concentric lamellae more distant, and 

 entirely obsolete over the central part of the valve. On the urn- 

 bonal ridge the concentric lamellae become raised, forming very 

 sharp delicate ridges ; on the anterior dorsal margin they become 

 squamose; on the posterior dorsal margin conspicuously spinose. 

 The whole shell is sculptured with extremely fine radials seen 

 only under the compound microscope. Right valve with a sin- 

 gle, strong cardinal tooth; lateral teeth obsolete; ventral margin 

 of shell smooth within, length 5.50, altitude 5 mm. A rare, 

 fragile and exquisite shell. ? 



Locality. — (Exp'd '16) Samba Hills at an approximate al- 

 titude of 540 feet. 



Genus Phacoides Blainville 

 Phacoides domingensis Dall 



Lucina Pennsylvania! Guppy, Quart. Jour. Geol. Soc. London, vol. 22, 



p. 292, 1866. Not of Linne. 

 Lticina Jamaicensis Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 251, 



1873. Not of Chemnitz which.=peciinatus Gmelin. 

 Lucina Pennsylvania Guppy, Quart. Jour. Geol. Soc, vol. 32, p. 530, 



1876. 

 Phacoides domingensis Dall, Trans. Wagner Inst., vol.3, pt. 6, pp. 



1363, 1586, pi. 50, fig. 11, 1903. 



This is the precursor of the recent P. pectinatus. Our shell 

 is a trifle larger than D all's type and measures in alti- 

 tude 37, diameter 22 mm. This species has been found at Ballast 

 Point, Florida; Bowden, Jamaica; and on an island in Lake 

 Henriquillo, southern Santo Domingo. 



Locality. — (Exp'd '16) Bluff 2, Cercado de Mao. 



