276 DR. J. W. GREGORY ON THE PALEONTOLOGY [Aug. 1 895, 



Genus Stephanoccenia, M.-Edwards & Haime, 1848. 

 Species Stephanoccenia intersepta (Esper), 1797. 



Synonymy : — 



Madrepora intersepta, Esper, 1795, ' Pflanzenth.' Fortsetz. Bd. i. p. 99, pi. Madrep. 

 Ixxix. 



Astrcea intersepta, Lamarck, 1816, 'Hist. Nat. Anim. s. Vert.' t. ii. p. 266; 

 Lamouroux, 1824, Encycl. Meth., 'Zooph.' p. 127 ; Lamarck, 1836, 'Hist. Nat. Anim. 

 s. Vert.' ed. 2, t. ii. p. 417. 



Non Astrcea intersepta, Dana, 1848, ' Zooph. Explor. Exped. Wilkes,' vol. viii. p. 246. 



Astrcea intersepta, Duchassaing, 1850, 'Anim. rad. Ant.' p. 16. 



Astrcea (Cellastr ceo) intersepta, Blainville, 1830, Diet. Sci. Nat. t. lx. p. 342 ; id. 

 1834, 'Man. Act.' p. 377. 



Stephanoccenia intersepta, M.-Edwards & Haime, 1848, 'Monogr. Astr.' Ann. Sci. 

 Nat. Zool. ser. 3, t. x. p. 300, pi. vii. figs. 1-1 b ; id. 1851, ' Polyp. Paleoz.' Arch. Mus. 

 Hist. Nat. t. v. p. 66 ; id. 1857/ Hist. Nat. Cor.' t. ii. p. 265 ; Duchassaing & Michelotti, 

 1861, ' Mem. Cor. Ant.' Mem. R. Accad. Sci. Tor. ser. 2, t. xix. p. 343. 



Stephanoccenia intersepta, var., Duncan, 1864, ' Foss. Cor. West Ind.' pt. ii., Quart. 

 Journ. Geol. Soc. vol. xx. p. 27. 



Stephanoccenia intersepta, Duchassaing & Michelotti, 1866, ' Suppl . Mem. Cor. Ant.' 

 Mem. R. Accad. Sci. Tor. ser. 2, t. xxiii.p. 168; Duncan, 1868, 'Foss. Cor. W. Ind.' 

 pt. iv., Quart. Journ. Geol. Soc. vol. xxiv. p. 12 ; Duchassaing, 1870, ' Rev. Zooph. 

 Ant.' p. 27 ; Quelch, 1886, ' Reef Corals,' Zool. ' Chall.' Exped. pt. xlvi. p. 12. 



Stephanoccenia Michelini, M.-Edwards & Haime, 1848, 'Monogr. Astr.' Ann. Sci. 

 Nat. Zool. ser. 3, t, x. p. 301 ; iid. 1857, ' Hist, Nat. Cor.' t. ii. p. 266 ; Duchassaing & 

 Michelotti, 1861, ' Mem. Cor. Ant.' p. 343 ; iid. 1866, ' Suppl. etc' p. 169 ; Duchas- 

 saing, 1870, 'Rev. Zooph. Ant.' p. 27; Quelch, 1886, 'Reef Corals,' Zool. 'Chall.' 

 Exped. pt. xlvi. p. 12. 



Plesiastraa spongiformis, Duncan, 1864, ' Foss. Cor. W. Ind.' pt. ii., Quart. 

 Journ. Geol. Soc. vol. xx. p. 39, pi. iv. fig. 6, a, b. 



Antillastrcea spongiformis, Duncan, 1884. ' Revis. Madr.' Journ. Linn. Soc, Zool. 

 vol. xviii. p. 108. 



Distribution. Recent: West Indies. Fossil: Barbados: Low-level Reefs, Ceres, 

 and near Bridgetown ; Guadeloupe, White Limestone {fide Duchassaing) ; Trinidad, 

 St. Croix ; San Domingo, silt. 



Notes on Synonymy. — This species has three different varieties, all 

 of which may occur on the same hloek. In the typical form, as 

 shown in M.-Edwards & Haime's figure (Ann. Sci. Nat. ser. 3, vol. x. 

 pi. vii. fig. 1) and some of the specimens from the Barbados reefs 

 (for example, B.M. B 2533), the calices are polygonal and crowded, 

 and separated by thin raised ridges. An extreme type of this is 

 shown in PL XL fig. 5 a, taken from a specimen from the Low-level 

 Beefs (B.M. B2533). On another portion of this specimen the 

 calices are separated by low flat areas formed by the separation of 

 the thecal walls (see PI. XL fig. 5 6). The third type appears very 

 different. The corallites are circular, and are separated from one 

 another by depressed bands ; the septa, moreover, are exsert. This 

 type is shown in PI. XL fig. 6 ; this is the variety described by M.- 

 Edwards & Haime as S. Michelini. The instructive series of spe- 

 cimens sent from Barbados by Messrs. G. F. Pranks and A. J. Jukes- 

 Browne clearly show that all these are phases of the same species. 



Duncan has described two species from Antigua (S. Reussi and 

 S. tenuis) which are quite distinct. 



The inclusion of the species made by Duncan in the type of a 

 new genus, Antillastrcea, necessitates the consideration of the four 

 species originally placed by Duncan in Plesiastrcea. The types are 

 all in the Museum of the Geological Society ; I have been kindly 

 permitted to have sections prepared from these. "Without such 

 sections I could not have come to any conclusion as to the affinities 



