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BULLETIN OF THE UNITED STATES FISH COMMISSION. 
M. Platygyra cerebriformis=Diploria cerebriformis (Lam.) , which must be called Diploma laby, inthi- 
formis (Linn). 1 
M. Platygyra phrygia = Leptoria phrygia, fide Milne-Edwards & Haime. 
M. Platygyra spatiosa = a synonym of Dendrogyra cylindrus. It is the basal , portion of a large 
column. 
Ehrenberg had in his Platygyra 8 species now distributed among 5 genera: Mxandrina, 2 species 
(not Meandrina Lamarck 1801) ; Cxloria, 3 species; Diplora, 1 species; Leptoria, 1 species; Dendrogyra, 
1 species. The name Meandrina can not he applied to any of these forms. The order of the publication 
of these genera, except Meandrina, is: 
Dendrogyra Ehrenberg, 1834. 
Diploria Milne-Edwards & Haime 1848. 2 
Leptoria Milne-Edwards & Haime 1848. 
Cxloria Milne-Edwards & Haime 1848. 
Ehrenberg in his treatment of Platygyra labyrinthica makes no mention of the West Indian forms, 
discussing only those from the Bed Sea; therefore if we follow his published work, the former must 
be omitted. The name Platygyra must be used instead of one of the four genera above noted. Since 
Cxloria comes last among those proposed by Milne-Edwards & Haime, I substitute Platygyra for 
Cxloria, following Dr. Briiggemann, who, in his “ Corals of Rodriguez,” 3 shows that Platygyra should 
take the place of Cxloria, and remarks that the type species is the Madrepora labyrinthica from the Red 
Sea. His course, in my opinion, is the only logical one. 
Pourtales 1 was the first of whom I know to point out the difficulty or impossibility of separating 
Cxloria and Mxandrina (Milne-Edwards & Haime). Duncan places Cxloria as a subgenus of Mxan- 
drina . 5 H. Stanley Gardiner has made some notes on the relations of the genera. 6 I can find no 
tangible differences between the two, the columellar characters being insufficient, therefore I merge 
Cxloria and Mxandrina of Milne-Edwards & Haime into a single genus and call it Platygyra Ehrenberg. 
If the West Indian species can not be referred to Platygyra, they must receive a new generic designation. 
Platygyra viridis (Le Sueur). Pis. ix, x, xi, xii, xixx. 
1786. Madrepora labyrinthica, Ellis & Solander, Nat. Hist. Zooph., p. 160, pi. xlvi, figs. 3, 4. Non Madrepora labyrinthica. 
PaTas, 1766. 
1797. Madrepora mxandntes, var., Esper, Pflanzenth. Fortsetz., Th. I, p. 101, pi. lxxxvii (fide Milne-Edwards & Haime). 
1820. Meandrina sinuosa? Le Sueur, M6m. Mus. Hist. Nat. Paris, t. VI, p. 278, pi. xv, fig. 4; + vars. viridis, p. 279, pi. xv, 
fig. 5; appressa, p. 280, pi. xv, fig. 6; rubra, p. 280, pi. xv, fig. 7; vineola, p. 280, pi. xv, fig. 8. Non Madrepora 
sinuosa, Ellis & Solander, 1786, nec Meandrina sinuosa , Quoy & Gaimard, 1833. 
1820. Meandrina dedalea, Le Sueur, op. sup. cit., p. 281, pi. xvi, fig. 9. 
1820. Meandrina labyrinthica, Le Sueur, op. sup. cit., p. 282, pi. xvi, fig. 10. 
1834. Mxandra ( Platygyra ) labyrinthica (pars) , Ehrenberg, Cor. Roth. Meer., Abhandl. K’gl. Akad. Wiss. Berlin for 1832, p. 323. 
1846. Meandrina strigosa, Dana, Zooph. Wilkes Expl. Exped., p. 257, pi. xiv, figs. 4a, 45. 
1849. Meandrina heterogyra, Milne-Edwards & Haime, Ann. Sci. Nat., 3i6me s&r., Zool., t. xi, p. 281. 
1849. Meandrina sinuosissima, Milne-Edwards & Haime, op. sup. cit,., p. 281. 
1849. Meandrina serrata, Milne-Edwards & Haime, op. sup. cit., p. 282. 
1849. Meandrina crassa, Milne-Edwards & Haime, op. sup. cit. , p. 282. 
1861. ? Leptoria hieroglyphica, Duchassaing & Michelotti, M6m. Cor. Ant., p. 75 (of reprint). 
1861. Leptoria frag ilis, Duchassaing & Michelotti, op. sup. cit., p. 75. 
1880. Mxandrina strigosa, Pourtalils, Mem. Mus. Comp. Zool., vol. vli, No. 1, pi. ix, figs. 6-9. 
1880. Mxandrina labyrinthiformis, Pourtales, op. sup. cit., pi. ix, figs. 10-12. 
1886. Mxandrina strigosa, Quelch, Reef Corals, Challenger Exp., pp. 10,92. 
1886. Mxandrina sinuosissima, Quelch, op. sup. cit., pp. 10,91. 
1886. Mxandrina labyrinthica, Quelch, op. sup. cit., pp. 10,12,91. 
1886. Hlxandrina sinuosa, Quelch, op. sup. cit., p. 12. 
1895. Mxandrina filograna, Gregory, Quart. Jour. Geol. Soc. London, vol. LI, p. 265. The synonymy includes two species, 
Platygyra viridis and Platygyra clivosa (Ell. & Sol.) 
1898. Mxandrina + filograna, Vaughan, Bull. Mus. Comp. Zool., vol. xxviii, No. 5, p. 275. 
1901. Meandrina labyrinthica + Ctenophyllia , Whitfield, Bull. Amer. Mus. Nat. Hist., vol. xiv, pp. 221-222, pis. xxxi, xxxn. 
In the preparation of the above synonymy the following collections have been studied: The 
Ehrenberg collection, in Berlin; the types and other specimens of Duchassaing & Michelotti, in Turin; 
the types of the four species of Milne-Edwards & Haime, in the Museum d’Histoire Naturelle, Paris; 
1 See paper on “ Some fossil corals from the elevated reefs 4 111. Cat. Mus. Comp. Zool., No. iv, 1871, p. 73. 
of Curapao, Arube, and Bonaire, pp. 45-48. . 5 Jour. Linn. Soc. Lond., vol. xvin, 1884, p. 89. 
2 Comptes Rendus, t. xxvii, 1848, p. 493. 6 Proc. Zool. Soc. Lond., vol. for 1898, p. 740. 
3 Phil. Trans. Royal Soc., vol. clxviii, 1879, p. 171. 
•Arranged according to sequence on the page. 
