TRANSACTIONS OF WAGNER 

 824 



TERTIARY FAUNA OF FLORIDA 



Shell regular, equivalve, inequilateral, ovoid, widely gaping, with the 

 umbones anterior; sculpture concentric, feeble, forming flask-shaped exca- 

 vations (chiefly in shells and corals) which are lined with calcareous matter, 

 or when not protected by the burrow, forming a paitial or complete shelly 

 tube to which extraneous matter is attached. Type of the restricted group 

 G. diibia Don. (-|- G. uiodiolina Lam.). 



Subgenus SPENGLERIA Tryon, 1862. 



Valves truncated behind, the beaks not so near the anterior end, with an 

 elevated area triangular and transversely lamellose, radiating from the beak 

 to the truncation on each valve. 



Type G. rostrata Spengler (-(- viytiloidcs Lam.). 



Under the impression that the adventitious tube was a constant character 

 Gould separated G. lagenula (= G. cymbia Spengler) as a genus under the 

 name of Ciiairbitiila (Proc. Boston Soc. N. Hist., viii., p. 22, 1861), but later 

 writers regard the formation of this sort of tube as accidental and possible 

 with any of the species. 



Cliccua Retzius is a complete synonvme of Gastrocliiejia Spengler. Cuvier 

 was the first to restrict the genus and to discriminate between Gastrocluvua 

 proper and Spcnglcria. Rocdlaria Fleuriau was founded on, the type of 

 Cuvier, ten years later, and Ritpdlaria Fleuriau was confused by Tryon with 

 Rocdlaria, probably by heterophemy. 



Tills genus extends well into the Mesozoic, and in the basal Eocene is 

 represented by G. gaincsoisis Harris (Bull. Pal., iv., p. 70, pi. 6, figs. 12, \2a, 

 1896), from the Midway horizon of Georgia, G. Dalli Harris (as Martesia, op. 

 at., p. 71, pi. 6, fig. 15), and G. {Spengleria ?^ dmitariopsis Harris [pp. at., p. 

 70, pi. 6, fig. 13), from the same horizon. From the Claibornian come G. 

 larva Conrad (Am. Journ. Sci., 2d Sen, i., p. 212, pi. 2, fig. 5, 1S46; Aldr., 

 Bull. Pal., ii., p. 71, pi. 5, fig. 12, 1895) and G. siibbipartita O. Meyer, which 

 has neither been described nor figured (cf Ber. Senck. Ges., 1887, p. 12). 

 Burrows are not uncommon, and have been described by Mej'er from Clai- 

 borne and by Clark from the Eocene of Maryland and Virginia. 



Gastrochsena ovata Sowerby. 

 Gastroch-ccna ova/a Sowerby, P. Z. S., 1S34, p. 21 ; Hanley, Descr. Cat. Rec. Sli., p. 10, 



pi. ix., fig. 42, 1842; Cpr. Mazatlan Shells, p. 15, 1857. 

 Rocdlaria ovaia Tryon, Mon. Pholad, p. 49, 1862. 



