Vol. 51.] AND PHYSICAL GEOLOGY OF THE WEST INDIES. 28 L 



Mycedium elephantotus, Oken, 1815, ' Lehrb. Naturg.' Zool Bd. i. p. 69 ; M.- 

 Edwards & Hairne, 1851, ' Monogr. Fong.' Aim. Sci. Nat. Zool. ser. 3, t. xv. pp. 131- 

 132 ; iid. 1860, ' Hist. Nat. Cor.' t. iii. p. 74 ; Duchassaing & Michelotti, 1866, 'Suppl. 

 Mem. Cor. Ant.' Mem. R. Accad. Sci. Tor. ser. 2, t. xxiii. p. 186 ; Ducliassaing, 

 1870, ' Rev. Zooph. Ant.' p. 31. 



Agaricia elephantotus, Schweigger, 1820, ' Handb. Naturg. ' p. 415 ; Ebrenberg, 1834, 

 ' Cor. roth. Meer.' Abh. k. Akad. Wiss. Berlin, 1832, p. 329. 



Pavonia elephantotus, Dana, 1848, ' Zooph. Explor. Exped. Wilkes,' vol. viii. 

 pp. 323-324. 



Madrepora cucullata, Solander & Ellis, 1786, ' Nat. Hist. Zooph.' p. 157, pi. xlii. 

 figs. 1, 2; Esper, 1795, ' Pflanzenth.' Fortsetz. Bd. i. p. 83, pi. Madr. lxvii. 



Agaricia cucullata, Lamarck, 1801, ' Syst. Anim. s. Vert.' p. 373 ; id. 1816, ' Hist. 

 Anim. s. Vert.' t. ii. 242 ; Lamouroux, 1821, ' Exp. Meth.' p. 54, pi. xlii. figs. 1, 2 ; id. 

 1824, Encycl. M^th., 'Zooph.' p. 12, pi. 484 ; Blainville, 1834, 'Man. Act.' p. 360, 

 pi. 56. fig. 3 ; Lamarck, 1836, ' Hist. Nat. Anim. s. Vert.' ed. 2, t. ii. p. 380. 



Mycedium cucullatum, Oken, 1815, ' Lehrb. Naturg.' Zool. Bd. p. i. 69. 



Mycedia cucullata, Dana, 1848, ' Zooph. Explor. Exped. Wilkes,' vol. viii. p. 339. 



My cedia fragilis, Dana, 1848, ibid. p. 341. 



Mycedium fragile, Verrill, 1864, ' List of Corals,' Bull. Mus. Comp. Zool. vol. i. 

 p. 55 ; Pourtales, 1871, ' Deep-Sea Corals,' 111. Cat. Mus. Comp. Zool. no. iv. p. 82 ; 

 ( — a — is), Pourtales, 1880, ' Flor. Reefs,' Mem. Mus. Comp. Zool. vol. vii. pt. 1, pi. xi. 

 figs. 1-10, pi. xiii. figs. 1-5, pi. xiv. figs. 1-9 ; Ortmann, 1888, ' Stud. Verbr. Steinkor.' 

 Zool. Jahrb. Bd. iii. Syst. p. 181 ; id. 1890, ' Morph. Steinkor.' Zeitschr. wiss. Zool. 

 Bd. 1. p. 288. 



Agaricia fragilis, Quelch, 1886, 'Reef Corals,' Zool. ' Chall.' Exped. pt. xlvi. 

 pp. 11, 12. 



Mycedmm Danai, Ducliassaing & Michelotti, 1861, ' Mem. Cor. Ant.' Mem. R. 

 Accad. Sci. Tor. ser. 2, t. xix. p. 357 ; iid. ' Suppl. Mem. Cor. Ant.' ibid. ser. 2, 

 t. xxiii. p. 186 ; Duchassaing, 1870, ' Rev. Zooph. Ant.' p. 31. 



Mycedium Sancti-Johannis, Duchassaing & Michelotti, 1866, op. supra cit. p. 187, 

 pi. x. rig. 11 ; Duchassaing, 1870, op. supra cit. p. 31. 



P Mycedium Cailleti, Duchassaing & Michelotti, 1866, op. supra cit. p. 187 ; Du- 

 chassaing, 1870, op. supra cit. p. 31 ; Pourtales, 1874, ' Hassler Corals,' 111. Cat. 

 Mus. Comp. Zool. no. viii. p. 44, pi. ix. fig. 12. 



Agaricia frondosa, Duchassaing & Michelotti, 1866, op. supra cit. pi. x. figs. 5, 6; 

 Duchassaing, 1870, op. supra cit. pp. 31-32 ; Quelch, 1886, ' Reef Corals,' p. 118. 



Distribution. Recent : West Indies ; Abrolhos Banks, Brazil ; Florida. Fossil : 

 Barbados : Low-level Reefs, near Bridgetown (Coll. Bishop Mitchinson & Franks) ; 

 San Domingo, Nivaje' Shale; Guadeloupe, Older Reefs. 



Notes on Synonymy.— This species is the most typical of the genus 

 Mycedium ; but, for reasons given in discussing the last species, the 

 generic value of this form is regarded as quite inadmissible. The 

 M. cucullatum has long been recognized as a synonym of the type- 

 species. M. fragile and M. Cailleti appear to be both varieties 

 based on specimens growing at a greater depth than the normal 

 form. 



Suborder PERFORATA. 

 Family MADREPORLM1. 



Genus Madrepora, Linn., 1767. 

 Subgenus Eitmadrepora, Brook, 1893. 

 Species Madrepora mtjricata, Linn., 1767. 



Distribution. Recent: West Indies, Vera Cruz, Florida; Australia; Pacific. 

 Fossil: Barbados: Low-level Reefs, Two Mile Hill, St. Michael's; near Bridge- 

 town ; Ceres ; Woodstock ; High-level Reefs, Welsh Town Gully (600 feet) ; 

 Guadeloupe, Newer Reefs. 



Notes on Synonymy. — This species was founded by Linnams for 

 the recent West Indian form. Its great variability was soon noticed, 



