152 DE. T. DAA'IDSON ON EECENT BEACHIOPODA. 



Mr. W. H. Dall, iu liis Index to the names wliich have been applied to the subdivi- 

 sions of the class Brachiopoda (Smithsonian Miscell. Coll. vol. xiii., Bull. U. S. Nat. 

 Mus. vol. i. no. 8, p. 30, Washington, 1877), states, as many zoologists have done, that 

 the so-termed Gioijnia capsula is an immature form, and perhaps that of JFaldheimia 

 cranium. 



Genus PLATYDIA, Costa. 



The subfamily into which the genus J^latydia should be placed has not yet been 

 satisfactorily determined. It is thus characterized by Dall : — " Shell with the loop 

 attached, not reflected ; animal with sigmoid brachia meeting behind the mouth, without 

 any spiral median lobe or lateral loops. Cardinal process absent." 



The genus FlatyiUa was proposed by Costa in January 1852, and by myself, entirely 

 independently, in May of the same year, under the name of Jjforrisia, which must now be 

 placed among the synonyms. 



The animal of FlatycUa has not yet been anatomically examined. 



89. Platydia anomioides (Scacchi), Philippi, sp. (Plate XXI. tigs. 15-19.) 



Terebratuhi Seminuluni; Pliilippi, Eumn. Moll. Slcilite, vol. i. p. 97, pi. vi. fig. Ija-ff, 1836. 



Orthis anoiiiioides (Scacchi, AIS.), Pliilippi, Fauua ]\Ioll. llegui iitriusquc SiciliiE, vol. ii. p. 69, 

 pi. xviii. fig. 9, 1844. 



Terebratuhi appressa, E. Forbes, Report of the Mollusca of the ^Egean Sea, Report Brit. Assoc, for 

 1843, pp. 141, 167, 193, 1844. 



Platidia anomioides, Costa, Fauna del regno di Napoli, p. 48, pi. iii. fig. 4, and pi. iii. bis. fig. 6, 1852. 



Morrisia seniinulum, Davidson, Ann. & Mag. Nat. Hist. 2nd ser. vol. ix. p. 371, 1852. 



Morrisia anomioides , Davidson, Proc. Zool. Soc. 1852, pi. xiv. fig. 29 ; Intr. to vol. i. Brit. Foss. Brach. 

 p. 71, pi. vi. figs. 30, 31, 1853; Woodward & Gray, Catalogue of Brachiopoda in the Brit. IMus. p. 108, 

 figs. 17, 18, 1853; S. P. Woodward, A Manual of the Mollusca, p. 218, 1856; H. & A. Adams, The 

 Genera of Recent Mollusca, vol. ii. p. 579, pi. cxxxi. figs. 5 a, b, 1858 ; E. Suess, Ueljcr die Wohnsitze 

 der Brachiopoden, Sitzungsb. k. Akad. Wissensch. Wien, p. 212, 1859. 



Terebratula (^Morrisia) anomioides, L. Reeve, Conch. Icon. pi. x. fig. 40, 1861, Ann. & Mag. Nat. Hist. 

 3rd ser. vol. vii. p. 184, 1861 ; Chemnitz, Man. de Conch, p. 208, fig. 1064, 1862. 



Morrisia anomioides, E. Dcslongchamps, Recherches sur I'Orgauisation du Alauteau chez les Brachio- 

 podes articules, Caen, p, 28, pi. iii. figs. 6, 7, 1864; Seguenza, Cat. Mai., Mem. Soc. Ital. Sci. Nat. 

 p. 66, pi. viii. fig. 6, 1865 ; H. C. Weinkauff, Die Conch, des Mittelmeeres, vol. i. p. 288, 1867. 



Platidia [Morrisia) anomioides, Davidson, On Italian Tert. Brach., Geol. Mag. vol. vii. p. 405, pi. xxi. 

 figs. 15, 15 «, 1870; Dall, Amer. Journ. of Conch, vol. vi. p. 143, 1870, and Proc. Acad. Nat. Sci. 

 Philadelphia, 1873, p. 192; P. Fischer, Brachiopodes des cotes oceaniques de France, Journ. de Couch, 

 vol. XX. p. 162, 1872; Monterosato, Poche note sulla Conch. Meditcrranea, 1875. 



Platidia seminulum, Monterosato, Journ. de Conch, vol. xxvii. p. 307, pi. 13. fig. 3, 1879. 



Platidia anomioides, Davidson, Report on the Brachiopoda, Voyage of H.M.S. ' Challengci-,' Zool- 

 vol. i. p. 55, pi. iv. figs. 10, 11, 1880; Zittel, Handbuch der Pal. Bd. ii. p. 708, 1880; E. Dcslongchamps, 

 Etudes critiques sur les Brachiopodes, p. 160, pi. xiii. fig. 19, 1884. 



Shell small, transversely oval, or nearly circular, semitransparent, yellowish Avhite, 

 con.spicuously perforated by minute canals ; foramen large, encroaching nearly equally 



