Vol. 51.] AND PHYSICAL GEOLOGY OF THE WEST INDIES. 267 



Mceandrina gyrosa, Lamarck, 1816, ' Hist. Nat. Anim. s. Vert.' t. ii. p. 247 ; 

 Lamouvoux, 1821, ' Exp. M6th./ p. 55, pi. Ii. fig. 2 ; Blainville, 1823, ' Meandrine, 

 Diet. Sci. Nat. t. xxix. p. 376 ; Deslongchamps, 1824, ' Encycl. M6th., Zooph.' 

 p. 508 ; Blainville, 1830, ' Zooph.' Diet. Sci. Nat. t. lx. p. 323 ; id. 1834, ' Man. Act.' 

 p. 357 : Lamarck, 1836, ' Hist. Nat.' ed. 2, t. ii. p. 388 ; Schomburgk, 1847, ' Hist. 

 Barbados, p. 562 ; Duchassaing, 1847, ' Const, geol. Guad.' Bull. Soc. geol. France, 

 ser. 2, t. iv. p. 1095 ; id. 1850, ' Anim. rad. Ant.' p. 16 ; id. 1855, ' Form. mod. Guad.' 

 Bull. Soc. 'geol. France, ser. 2, t. xii. pp. 754, 756. 



Mussa gyrosa, Dana, 1848, ' Zooph. Explor. Exped. Wilkes,' vol. viii. p. 186. 



Manicina gyrosa, Ehrenberg, 1834, 'Cor. roth. Meer.' Abh. k. Akad.Wiss. Berlin, 

 1832, p. 326. 



Colpophyllia gyrosa, M. -Edwards & Haime, 1849, ' Monogr. Astr.' Ann. Sci. Nat. 

 Zool. ser. 3, t. xi. p. 266 ; iid. 1851, ' Polyp. Paleoz.' Arch. Mus. Hist. Nat. t. v. p. 84 : 

 iid. 1857, ' Hist. Nat. Cor.' t. ii. p. 384 ; Duchassaing & Michelotti, 1861, ' Mem. Cor. 

 Ant.' Mem. R. Accad. Sci. Tor. ser. 2, t. xix. p. 349 ; Verrill, 1864, ' List of Corals,' 

 Bull. Mus. Comp. Zool. vol. i. p. 49 ; Duchassaing & Michelotti, 1866, 'Suppl. Mem. 

 Cor. Ant.' Mem. R. Accad. Sci. Tor. ser. 2, t. xxiii. p. 174; Duchassaing, 1870, 

 'Rev. Zooph. Ant.' p. 29 ; Pourtales, 1871, 'Deep-Sea Corals,' III. Cat. Mus. Comp. 

 Zool. no. iv. p. 74; Lindstrom, 1877, 'Contrib. Act. Atl.' Handl. k. Svensk. Vet.- 

 Akad. Bd. xiv. no. 6, p. 22 ; Pourtales, 1880, 'Flor. Reefs,' Mem. Mus. Comp. Zool. 

 vol. vii. no. 1, pi. ix. figs. 13-16 ; Quelch, 1886, ' Reef Corals,' Zool. ' Chall.' Exped. 

 pt. xlvi. p. 12; Ortmann, 1890, 'Morph. Skel. Steinkor.' Zeit. wiss. Zool. Bd. 1. 

 p. 305. 



Mussa frac/ilis, Dana, 1848, op. supra cit. p. 185, pi. viii. fig. 7. 



Colpophyllia fragilis, M. -Edwards & Haime, 1849, ' Monogr. Astr.' Ann. Sci. Nat. 

 Zool. ser. 3, t. xi. p. 267 ; iid. 1851, ' Polyp. Paleoz.' Arch. Mus. Hist. Nat. t. v. 

 p. 84, p. 267; iid. 1857, 'Hist. Nat. Cor.' t. ii. p. 385 ; Duchassaing & Michelotti, 

 1861, ' Mem. Cor. Ant.' p. 349; iid. 1866, 'Suppl. etc' p. 174; Duchassaing, 1870, 

 ' Rev. Zooph. Ant.' p. 29. 



Manicina mceandrites, non Esper, Ehrenberg, 1834, 'Cor. roth. Meer.' p. 326. 



Colpophyllia tenuis, M. -Edwards & Haime, 1849, 'Monogr. Astr.' p. 267; iid. 

 1857, ' Hist. Nat. Cor.' p. 385 ; Duchassaing & Michelotti, 1861, ' Mem. Cor. Ant.' 

 p. 349 ; iid. 1866, ' Suppl. etc' p. 174 ; Duchassaing, 1870, ' Rev. Zooph. Ant.' p. 29. 



Distribution. Recent : West Indies, Bermuda. Fossil : Barbados : High-level 

 Reefs, Castle Grant ; Low-level Reefs, Bridgetown, Guadeloupe, Newer and older 

 Reefs. 



Notes on Synonymy. — The type of O. tenuis is in Paris, and seems 

 to be only a young form of this species. The C. fragilis is probably 

 a variation due to growth at a somewhat greater depth than the 

 normal form. G. breviserialis appears to be definitely distinct. 



Genus Hydnophoka, Fischer de Waldheim. 

 Species Hydnophora latefundata, sp. n. 



Diagnosis. Coral encrusting. Thin common plateau. 



Monticules large, blunt, serial. Bases broad (whence specific 

 name). High, conical or subcoluranar, often elongated transversely 

 to the calicinal valleys. Irregularly distributed ; usually in dichoto- 

 mizing rows. 



Septa thick, uniform ; strongly dentate. Calicinal centres in- 

 distinct. 



Dimensions. Height of monticules = 3 mm. ; breadth=3*4 mm. 



Distribution. Fossil : Barbados : High-level Reefs, Castle Grant, 

 1070 feet (Jukes-Browne Coll.), Spring Estate, St. Andrews ; 

 Trinidad, St. Croix (Geol. Soc. Coll.). 



Figures. PI. XI. fig. 1 a. Specimen from Castle Grant (B. M. Pt.), 

 nat. size. PI. XI. fig. 1 b. Monticules enlarged. 



Affinities. The genus Hydnopliora has not been previously recorded 



