200 PROCEEDINGS OP THE ACADEMY OF 



Family DISCINID^, Gray. 



Discimdae, Gray, Syn. B. M. i. p. 155. 1840. Davidson, Intr. 



Bracli. pp. 51, 125. 1853. Dall, Bull. Mus. Comp. Zool. 



1. c. p. 3G. 1871. (Full synonym}'.) 

 Orbiculacea, Anton, Verzeichn, p. 21. 1839. 

 Orbiculidse, King, An. Mag. N. H. xviii. p. 28. 184G. 

 Orhicidina, Agassiz, Nom. p. 757 (pars). 1848. 

 Craniadee (pars), Forbes and Hanle}', Brit. Moll. ii. p. 364. 1853. 



Genus DISCINA, Lam. 



Discina, Lam. An. s. Yert. Ed. i. vi. p. 236. 1819. 



Cuvier, Regne An. Ed. Voigt, iii. p. 602. 

 Crania^ /3. Schumacher, Essai, p. 102. 1817. 

 Crania (sp.), Gld. Moll. U. S. Ex. Ex. p. 4G5. 1852. 

 Orhicula, ^hy. Min. Conch, vi. p. 4, pi. 506. 1830. Sby. Thes. 



Conch, i. p. 365. 1847. Owen, Anat. Inv. p. 503. 1855. 



Chemn. Man. ii, p. 231. 

 Orbicula (sp.). Lam. Eichwald. 

 Discina, Gray, Ann. Phil. xxvi. (new ser. x.) p. 244. 1825. Dav. 



Lit. Clas. Braoh. pp. 51, 126. 1853. H. & A. Adams, 



Gen. Rec. Moll. ii. p. 584. 1858. Dall, Bull. Mus. Comp. 



ZooL 1. c. p. 38. 1871. (Full syn.) 



Subgemis Discina, (Lam.) Dall. 



Discina, Dall, Bull. Mus. Comp. Zool. 1. c. p. 39. 1871. 

 1. Discina striata, Schumacher. 



Crania i3 striata, Schum. Essai, p. 102, pi. xx. figs. 1 o-f. 



1817. Not of Defrance. 

 Crania radiosa, Gld. Moll. U. S. Ex. Ex. p. 465, figs. 480 



a-c. 1852. 

 Orbicula striata, Sby. Thes. Conch, i. p. 366, pi. 73, fig. 9. 



1847. Forbes and Hanley, Brit. Moll. ii. p. 368. 1853. 



Dav. An. Mag. Nat. Hist. ix. p. 376. 1852. 

 Orbicula Evansi, Davidson, P. Z. S. p. 81, No. 12, pi. xiv. 



figs. 32-34. 1852. An. Mag. Nat. Hist. ix. p. 376. 1852. 



Suess, Wohns. L p. 44 (226). 1859. 

 Orbicula norvegica, Sb}'. Trans. Lin. Soc. xiii. p. 468, pi. 



xxvi. fig. 2. 1822. (Syn. excl.) Gen. Sh. fasc. xiii. figs. 



3-5. Not 0. norvegicaj Lam. 



