148 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



Subgenus ANTIGONA sensu strictu. 



Antigona Schumacher, Essai, pp. 51, 154, 1817. Sole example, A. lamellaria 

 Schumacher, Essai, pi. 14, fig. 2, Dosinia lamarckii Gray, 1838; not 

 AnUgonus Hubner, 1820 (Lepidoptera). — Dall, Trans. Wagner Inst., 

 vol. 3, pt. 6, p. 1273, 1903. 



A7-tena Conead, Amer. Journ. Conch., vol. 6, p. 76. 1870. Venus stammea 

 Conrad. — Fischer, Man. de Conchyl., p. 1084. 1887. 



Artenia Tryon, Syst. Conch., vol. 3, p. 178, 1884. 



In my discussion of this group in the Wagner Transactions I did 

 not regard the difference of termination between Antigona and 

 Antigonus as creating a synonym, but the usage has become fixed 

 that it is inadmissible. The name of Schumacher will take preced- 

 ence for the genus, while for the section the name of Conrad may be 

 retained. 



ANTIGONA GLYPTOCONCHA Dall. 

 Plate 25, fig. 1. 



Cytherea (Artena) glyptoconcha Dall, Trans. Wagner Inst., vol. 3, pt. 6, 



p. 1277. pi. 55, fig. 24, 1903. 

 Cytherea staminea Heilpein, Trans. Wagner Inst., vol. 1, p. 116, 1887, not 



of Conrad, 1839. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. Will- 

 cox, Burns, and Dall. IT. S. Nat. Mus. No. 165213. 



This rather abundant species has the general aspect of Lirophora, 

 the minute sculpture of Artena^ and the hinge of Antigona. It 

 varies remarkably in outline, as I have shown in the Wagner Trans- 

 actions. 



Section ARTENA sensu strictu. 



ANTIGONA (ARTENA) SHEPARDI Dall. 



Plate 25, fig. 4. 



Cytherea (Artena) shepardi Dall, Trans. Wagner Inst., vol. 3, pt. 6, 

 p. 1278, pi. 55, fig. 16, 1903. 



Oligocene of the Tampa silex beds at Ballast Point, Tampa Bay, 

 and of the limestone of Hillsboro Bay near by, in Florida. Shep- 

 ard, Willcox, Post, and Dall. U. S. Nat. Mus. Nos. 165212, 166116. 



This species recalls C. ucutfana in sculpture, but has the Chione- 

 shape of Artena. 



Genus CHIONE Megerle von Muhlfeldt. 



Chionc Megerle, Mag, Ges. Naturf. Freunde zu Berlin, vol. 5, p. 51, 1811. 



Venus cancellata (Linnaeus) Lamarck. Not Chione Desvoidy, 1830, 



nor of Gray, 1838. 

 Chione Dall, Trans. Wagner Inst., vol. 3, pt. 6, p. 1286, 1903. 



