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9S3 



TERTIARY FAUNA OF FLORIDA 



Solen Conradi Dall. 

 Solen curtus Conrad, Am. Journ. Sci., 2d Ser., v., p. 432, fig. 14, 1848 ; not of Desmou- 



lins, 1832. 

 Plectosolen curtus Conrad, S. I. Eocene Checkl., p. 8, 1866. 

 Ensis curtus Meek, S. I. Miocene Checkl., p. 12, 1864. 



Oligocene? or Miocene of Astoria, Oregon; Conrad. 



The type of this species appears to be lost, but it is certainly not a Plecto- 

 solen, and the figure looks more like a true Solen than an Ensis. It is of the 

 general form of 5'. sicarius, but smaller. I have collected what I suppose to 

 be this species from the Empire beds at Coos Bay. 



Solen (Plectosolen) protextus Conrad. 

 Donax? protextus Conrad, Geol. Wilkes' Expl. Exp., p. yzi. pi. 17, fig. 9, 1849. 

 Solena protexta Conrad, Am. Journ. Conch., i., p. 152, 1865. 

 Plectosolen protextus Conrad, Am. Journ. Conch., ii., p. 103, 1866; S. I. Eocene Checkl., 



p. 9, 1866. 

 Hypogella protexta Gabb, Pal. Cal., ii., p. 89, i86g. 



Upper Eocene ( ?) or Miocene of Oregon, near Astoria, and at Coos Bay. 



This species was badly figured from a poor cast. It is a member of the 

 section Plectosolen, which is easily distinguished from Solena by the deep 

 furrow in the anterior part of the valves. The type specimen is lost, but a 

 similar shell is not uncommon in the Miocene of the Empire beds at Coos Bay, 

 which are practically of the same horizon as the Miocene of Astoria, and the 

 same or a very similar form is found in transitional (Oligocene?) beds above 

 the Eocene of Cape Arago. 



Solen (Plectosolen) lisbonensis Aldrich. 

 Solen lisbonensis Aldrich, Bull. Ala. Geol. Survey, i.. p. 37, pi. 4, fig. 4, 1886. 

 Eocene of the Chickasawan horizon at Lisbon, Alabama ; Aldrich. 



Variety abruptus Dall. 



Claibornian Eocene of Clarke County, Mississippi ; Burns. 



This form, represented by numerous fragments, differs from Aldrich's 

 figure by its more abrupt anterior truncation and relatively wider valves. It 

 will probably, when more complete specimens are obtained, prove to belong 

 to a distinct species. 



Other forms in our Tertiary belonging to the true Solens are Solena diego- 

 ensis Gabb (Pal. Cal., i., p. 213, pi. 32, fig. 280, 1866; ii., p. 176, 1868) and 



