TRANSACTIONS OF WAGNER 

 1054 



TERTIARY FAUNA OF FLORIDA 



Macoma ( Psammacoma ) olivella n. sp. 

 Plate 47, Figure 20. 



Oligocene marl of Bowden, Jamaica. 



Shell large, solid, moderately convex, with rather full, conspicuous beaks, 

 equivalve, very inequilateral ; anterior dorsal slope rectilinear, anterior end 

 roLUided ; posterior dorsal slope slightly concave, posterior end much shorter, 

 rounded below, blunt terminally and subangulate at its junction with tht 

 dorsal line ; an elongated lunule and escutcheon, moderately impressed and 

 not very definitely limited, are present ; surface smooth, except for lines of 

 growth and on the ridge bounding the lunule, which is slightly undulated, 

 especially near the beaks ; hinge normal, teeth rather small, pallial sinus gib- 

 bous, short, partly free below. Lon. 23, alt. 13, diam. 5 mm. 



This species recalls M. (Psammacoma) elongata Hanley of the recent 

 Panama fauna. 



Macoma (Psanunacoma?) producta Conrad. 



Tellina producta Conrad, Fos. Medial Tert., p. 36, pi. 19, fig. 5, 1840. 



Tellina (Peronaodenna) producta Conrad, Proc. Acad. Nat. Sci. Phila. for 1863, p. 573, 



1864. 



Miocene of St. Mary's River, Maryland ; Meek. 



This approximates to M. tenia by the figure, and may not belong here. 



Macoma (Psammacoma?) Holmesii n. sp. 



Plate 47, Figure 4. 



Miocene of the Natural Well, Duplin County, North Carolina ; Burns. 



Shell large, solid, equivalve, inequilateral, with low beaks, moderately con- 

 vex, elongated ; anterior end longer, the dorsal slope rectilinear, the end 

 rounded, the base nearly straight; the posterior end shorter, the anterior verti- 

 cally subtruncate, but not angular ; a feeble sulcus in the left valve extending 

 from the umbo to the posterior end of the base ; a faint, narrow escutcheon 

 but no lunule visible; surface smooth except for incremental lines, which 

 show a little stronger on the posterior dorsal area ; hinge short, teeth small, 

 resilium verging on Psamiiwtreta, to which this species may eventually, with 

 more material, prove to belong; pallial sinus long but not reaching the an- 

 terior adductor, sinuous above; posterior dorsal ridge of the right valve 

 insinuated at the margin of the valve. Lon. 32, alt. 17, diam. 8 mm. 



The species is named in honor of Professor J. A. Holmes, State Geologist 

 of North Carolina. 



