136 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



Section JAGONIA Kecluz. 



Jagonia Recluz, Melanges Malac, p. 14, 1869; Actes Soc. Linn, de Bor- 

 deaux, vol. 27, p. 39 1870. Type, Le jagon Adanson, =Yenus orhicu- 

 lata Montagu, -\-Lucma pecten Lamarck. 



CODAKIA (JAGONIA). sp. indet. 



Codakia (Jagonia), sp. Indet. Dall, Trans. Wagner Inst., vol. 3, pt. 6, p. 

 1349, 1903. 



Tampa silex beds, at Ballast Point, Tampa Bay, Florida. IT. S. 

 Nat. Miis. No. 165198a. 



Specimens too young to be positively identified specifically were 

 obtained as above. 



CODAKIA (JAGONIA) SCURRA Dall. 



Plate 21, figs. 15, 16. 



Shell small, rounded quadrate, moderately inflated, with low beaks 

 nearly at the posterior third; a short lanceolate lunule and longer 

 sulcus for the ligament; sculpture of numerous rounded close-set 

 radial ribs, crossed by incremental lines, which rise to low arched 

 imbrications where they override the ribs, especially distally; inte- 

 rior closed by matrix. Length 12, height 8, maximum diameter 

 6 mm. 



Tampa silex beds, at Ballast Point, Tampa Bay, Florida. U. S. 

 Nat. Mus. No. 165198. 



This has much the same sculpture as several of the recent species, 

 though most of the Chipola Jagonias are much smoother and more 

 rounded in shape. 



Genus MYRTAEA Turton. 



Myrtaea Turton, Dithyra Brit., p. 133, 1822. Sole example, Venus spinifera 



Montagu. — Gray, List Brit. An., p. 98, 1851. — H. and A. Adams, Gen. 



Rec. Moll., vol. 2. p. 468, 1857.— Dall, Trans. Wagner, Inst., vol. 3, pt. 



6, p. 1356, 1903. 

 Cyrachcea Leach, Moll. Gt. Brit., p. 314, 1852. 



Ortygia (sp.) Brown, 111. Conch. Gt. Britain, pi. 19, figs. 14, 15, 1827. 

 Myrteopsis Sacco, Moll. Terz. Piem. e Lig., vol. 29, p. 96. 1901. Type, M. 



taurolaevis Sacco. 



Section EULOPIA Dall. 



Eulopia Dall, Trans. Wagner Inst, vol. 3, pt 6, p. 1357, 1903. Type, 

 Lucina sagrinata Dall, Proc. U. S. Nat. Mus., vol. 12, p. 263, pi. 14, fig. 

 11. 1887. 



MYRTAEA (EULOPIA) VERMICULATA Dall. 



Plate 23, fig. 14. 



Myrtaea (Eulopia) rerouculafa Dall, Trans. Wagner Inst., vol. 3, pt. 6. p. 

 1359, pi. 52, fig. 5, 1903. 



