192 PROCEEDINGS OP THE ACADEMY OF 



1. Platidia anomioides, Scacchi, 



Orthis anomioides, Scacchi, Phil. Moll. Sic. ii. p. G9, pi. 18, 



fig. 9. 1844. 

 T. appressa, Forbes, Rep. Br. As. p. 193. 1843. 

 T. seminulum, Davidson (not Phil.). 

 Morrisia anomioides, Dav. Mt. Brach. and An. Nat. Hist. 



p. 311. 1852. Bve. Conch. Icon. pi. 10, fig. 40. 

 Platidia ajiomoides, O. G. Costa, 1. c. p. 47. 1852. Dall, 



1. c. p. 143, figs. 20-21. Bull, M. C. Zool. iii. No. 1, p. 18. 



18tl. 



Florida Beefs ; Shetland Islands ; Mediterranean. 



2. Platidia gigantea, Deshaj'es. 



P. gigantea, Desh. Maillard, Moll. Isle de Bourbon. 1864. 



Isle de Bourbon, Southern Ocean. 



3. Platidia lunifera, Philippi. 



T. lunifera, Phil. Moll. Sicilia, i. p. 97, pi. vi. fig. 16. 1836. 

 Orthis lunifera, Phil. loc. cit. ii. p. 69. 1844. 

 3Iorrisia lunifera. Gray, B. M. Cat. p. 108. 

 Platidia lunifera, Dall, 1. c. p. 143. 1870. 



3Iediterranean. 



Doubtful Species. 



Platidia Davidsoni, Deslongchamps, An. Nat. Ilist. xvi. p. 443, 

 pi. X. fig. 20 a-d. 1855. 



3Iediterra7iean. 

 Section MEGATHYRIN.E, Dall. 



Argiopidae, King, Perm. Fos. p. 142. 1850. 



Megathyrinse, Dall, 1. c. p. 143. 1870. Bull. Mus. C. Zool. iii. i. 

 p. 18. 1871. 



Genus MEGATHYRIS, D'Orbigny. 



Megathyris, D'Orb. Pal. Fran. Terr. Cret. p. 147. 1847. Prodr. 

 ii. p. 259, An. Sci. Nat. 1848. Forbes k Hanley, Brit. 

 Moll. ii. p. 361. 1850. Dall. Am. Journ. Conch, vi. p. 

 144, 1870 ; vii. p. 68. Bull. Mus. Comp. Zool. iii. i. p. 18. 

 1871. 



Argiope, Deslongchamps, Mem. Soc. Lin. de Norm. vii. p. 9, 1842 

 (not Savigny & Audouin, 1827, Arachnidse). Desl. Bull. 

 Soc. Geol. de France, vii. ser. ii. p. 65. Also Davidson, 

 Reeve, Woodward, Bronn, II. & A. Adams, Chcmn, Jef- 

 freys, and the majority of authors. (Norn, preoc.) 



