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lOI 5 

 TERTIARY FAUNA OF FLORIDA 



Shell without laterals, having the internal characters of Angulus s. s. 

 and the external appearance of Eurytellina. Tertiary and recent. 



Subgenus Omala Schumacher, 1817 (+ Honiala Agassiz, 1848, and Fischer, 

 1887; non Morch, 1853). Type Tellina hyalina Gmelin. 



Shell mesodesmatiform, inequilateral, compressed, with narrow and pro- 

 nounced lunule and escutcheon. Anterior laterals small and approximate, 

 posterior laterals absent ; no internal radii, sinus short, coalescent with the 

 pallial line below ; surface smooth or feebly concentrically sculptured. Eocene 

 to recent. 



The inequilaterality and compression of these species give them a very 

 characteristic look, but the distinctions are not very important. 



Section Homalina Stoliczka, 1871 (-\- Honiala Morch, 1853; not 

 Agassiz, 1848). Type Tellina triangularis Dillwyn. 



Shell resembling Omala, but (according to the literature) without any 

 lateral teeth. Recent. This species requires further examination and may 

 prove to belong to Omala proper. It is smaller than T. hyalina, and the 

 laterals if present may have been overlooked. Stoliczka separated this form 

 from Omala under a mistaken impression as to the type of that group, but 

 if there is a real difference the name can be retained, as he specifies T. triangu- 

 laris as the type of Homalina. The Parisian Eocene form, T. Lamarckii 

 Deshayes, belongs to Omala in the strict sense, at least if one may judge from 

 figures and descriptions. 



The following Eocene species have been described from the region under 

 consideration ; the sections under which they would probably rank are in- 

 serted in parentheses: T. {Arcopagiaf) Spillmani Dall = T. albaria Conrad, 

 Am. Journ. Conch., i., p. 138, pi. xi., fig. 7, 1865; not T. albaria Conrad, 

 Geology Wilkes Expl. Exp., p. 725, App'., pi. 18, fig. 5, 1849, which is prob- . 

 ably an Angulus. T. Spillmani is from the Jacksonian of Mississippi ; T. 

 (Arcopagia) alta Conrad, 1833, Claibornian, not T. (Metis ^ alta Conrad, 1837; 

 T. {Arcopagia) ebiirneopsis Convad, 1865, Jacksonian ; T. {Moerella) Greggi 

 Harris, 1896 (-|- T. lignitica Harris, 1896, but not virginiana Clark, 1895), 

 Chickasawan ; Tellina linifera Conrad, 1865, Jacksonian; " T." nitens Lea, 

 ^833 i= Abra nitens Conrad, not T. nitens Gregorio, which is founded on 

 Diplodonta ungulina in a very young state), Claibornian; T. (Moerella) 

 ovalis Lea, 1833 (= T. Leana Dall, not T. ovalis Sowerby, 1825), Claibornian; 

 T. (Peronidia?) papyria Conrad, 1833 (-|- T. mooreana Gabb, i860), Lower 



