TRANSACTIONS OF WAGNER 

 792 



TERTIARY FAUNA OF FLORIDA 



Section Botula Morch. Surface deeply concentrically sulcate, shell in- 

 flated, with conspicuously spiral umbones, the epidermis polished. Type M. 

 cinnamoine7is Lam. 



This section, if it were not for its peculiar muscular scars, might perhaps 

 equally well be placed under Lithophaga, as has been done by Fischer. It 

 is intermediate, conchologically, between the boring Litliopliagi and the 

 nestlers, as regards externals. 



Section Arcoperna Conrad (Am. Journ. Conch., i., p. 140, pi. lO, fig. 14, 

 1865). Shell oval, general form like Boiula, but the surface finely striated or 

 reticulated and the margin, except over the ligament, crenulated. Type M. 

 (A.) filosus Conr., /. c. Jacksonian and Parisian Eocene. 



This section resembles Modiolaria, except in the absence of the medial 

 unstriated impressed area, and the more oval outline of many of the species. 

 The umbones are swollen and conspicuous. 



Modiolus cretaceus Conrad. 

 Modiola creiacea Conrad, Trans. Geol. Soc. Penna., i., p. 340, pi. 13, fig. 2, 1835. 

 Perna cretacea Conrad, Am. Journ. Conch., i., p. 10, 1S65. 



Jacksonian Eocene of Clarke and Choctaw Counties, Alabama, Conrad ; 

 near Fail Post-Ofifice, Alabama, in the Zeuglodon bed, Schuchert; ? Oligo- 

 cene of western Florida, Eldridge; ? Upper Oligocene of Oak Grove, Santa 

 Rosa County, Florida, Burns. 



This is a large species resembling M. modiolus L. A few young shells 

 represented by internal casts and a lot of fragments from Oak Grove, col- 

 lected by Eldridge and Burns, may belong to this species, but are insufficient 

 for a positive decision. 



Modiolus pugetensis n. s. 

 Tlate 35, Figure 17. 



Eocene of the Puget group in the State of Washington, from the old 

 Renton coal mine, near Seattle; Willis. 



Shell small, short in front, arched and produced behind ; concavely im- 

 pressed in front, with a rounded ridge extending from the beaks to the lower 

 posterior margin ; surface polished, with concentric lines of growth. Alt. 

 17.7, max. lat. 9.5, diam. 5 mm. A larger specimen measures 25 mm. from 

 end to end, but is imperfect. 



This is a very simple little species, but unlike any other in our Tertiary. 



