268 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.57. 



My doubts as to the specific distinctness of this form from G. albida 

 are not entirely removed, although the adults show some marked 

 differences. Dr. Thomas Davidson, however, was of the opinion 

 that they are distinct. He mentions the presence of a very similar 

 species, 0. lesueuri in the lower Silurian. 



GLOTTIDU AUDEBARTI Broderip. 



lAngula audebardiBRODERip, Trans. Zool. Soc, vol. 1, p. 143, pi. 23, fig. 14, 1835. — 

 G. B. SowERBY, Thes., vol. 1, p. 338, pi. 67, fig. 5, 1847. — Davidson, Ann. 

 Mag. Nat. Hist., ser. 2, vol. 9, p. 377, 1852. 



Lingula audebarti Deshayes, Anim. s. Vert., vol. 7, p. 390, 1836. 



Lingula audebardii Kuster, Conch. Cab. Lingula, p. 15, pi. 1, figs. 10-11, 1843. 



Type locality. — Isle of Punam, Bay of Guayaquil, in 7 inches hard, 

 sand, between tides. H. Cuming. 



Owing doubtless to the condition in which Doctor Davidson's 

 posthumous papers were left there is an extraordinary confusion in 

 the synonymy of this species in the part of his monograph published 

 after his death. The species is confused with G. pyramidata Stimp- 

 son, which is not only totally unlike G. audeharti specifically, but 

 comes from a different zoological province. The reference under 

 Sowerby should be to the Thesaurus and not to the Conchologia 

 Iconica. 



Glottidia audeharti is a large species with the umbonal half mostly 

 white, the distal half of the valves painted with a brilliant blue 

 green, unlike any other species in the genus.* The spelling of the 

 original name was corrected by Deshayes to agree with the correct 

 spelling of the name of Baron d'Audebart de Ferussac, whom Brod- 

 erip desired to honor. 



GLOTTIDU PYRAMroATA SHmpson. 



? Lingula antillarum Reeve, Conch. Iconica, Men. Lingula, pi. 2, fig. 8, 1859, 



Martinique? 

 Lingula pyramidata Stimpson, Amer. Joum. Sci. Arts, vol. 39, p. 444, 1860. — 



W. K. Brooks, Sci. Res. Chesapeake Zool. Lab., vol. 1, pp. 35-112, pis. 1-6, 



1879. 

 Glottidia pyramidata Dall, Amer. Journ. Conch., vol. 6, p. 158, 1870; Proc. Acad. 



Nat. Sci. Phila. for 1873, p. 204.— Morse, Mem. Boston Soc. Nat. Hist., vol. 5. 



No. 8, pis. 30-32, 43-46, 47, 48, 1902.— Davidson, Mon. Rec. Brach., pt. 3, 



p. 223, (ex parte) pi. 28, figs. 10, 11 (only), 1888. 



Type locality. — Beaufort, North Carolina, at extreme low tide, not 

 uncommon. Stimpson. 



