Vol. 51.] AND PEYSICAL GEOLOGY OP THE WEST INDIES. 269 



Dichoccenia porcata (non auct.), Pourtales, 1880, 'Flor. Reefs,' Mem. Mus. Comp. 

 Zool. vol. vii. no. 1, pi. x. 



Barysmilia intermedia, Duncan, 1863, ' W. Ind. Cor.' pt. i., Quart. Journ. Geol. 

 Soc. vol. xix. p. 431, pi. xv. fig. 4 ; id. 1868, do. pt. iv., ibid. vol. xxiv. p. 23 ; Duchas- 

 saing & Michelotti, 1866, ' Suppl. etc' p. 165 ; Duchassaing, 1870, ' Rev. Zooph. 

 Ant.' p. 27. 



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

 Bridgetown (Franks Coll.) ; San Domingo : Esperanza Shale, Nivaje Shale, and 

 Tufaceous Limestone. 



Notes on Synonymy. — This species has given rise to great difficulty ; 

 its earliest history I have not been able to unravel. It was con- 

 fused with Dichoccenia uva (Esper), and many of the early records 

 of this East Indian species are no doubt based on D. Stokesi. 

 Duchassaing & Michelotti had a fine series of specimens, all now in 

 the Museum at Turin ; their new species seem to be based on 

 individual variations. D. paucijlora is a form with scattered calices. 

 D. elliptica is a form that has grown quickly, so that the calices are 

 crowded, and they have undergone repeated fission. D. cequinoxiahs 

 is a variety also with crowded calices : these average 6 mm. in 

 length by 3 mm. in breadth, and are separated by ccenenchyma 

 only 1 mm. broad ; it appears, however, to have grown slowly, as 

 fission is much rarer than in the previous form. I), guadalupensis 

 is a small undergrown variety of (equinox ialis. The D. porcata of 

 Pourtales is a variety in which the formation of long series of con- 

 fluent calices has reached its extreme limit for this species. Duncan's 

 Barysmilia intermedia appears to be a young form of this ; it looks 

 much like a Barysmilia externally, but, as the specimen has a well- 

 marked columella, it cannot belong to that genus. 



The two species D. uva and D. Stokesi are closely allied. The 

 distinctions that separate them from D. porcata are so well marked 

 as to be probably of subgeneric value. 



Genus Lamellastk^a, Duncan, 1868. 

 Species Lamella sir^: a Smythi, Duncan. 



Synonymy : — 



Lamellastrma Smythi, Duncan, 1868, ' W. Ind. Foss. Cor.' Quart. Journ. Geol. 

 Soc. vol. xxiv. p. 20, pi. i. figs. 2a, 2b. 



Distribution. Fossil : Antigua Marl (type Brit. Mus.) ; Barbados : High-level 

 Reefs, Castle Grant (Jukes-Browne Coll.). 



Genus Favia, Oken, 1815. 

 Species Favia ananas (Pallas), 1766. 



Synonymy : — 



Madrepora ananas, Pallas, 1766, ' Elench. Zooph.' p. 321 ; Ellis & Solander, 1786, 

 ' Hist. Nat. Zooph.' p. 168, pi. xlvii. fig. 6 ; non Linnaeus, 1767, 'Syst. Nat.' ed. xii. 

 p. 1275; non Esper, 1789, ' Pfianzenth.' pp. 128-131, pi. Madrep. xix. 



Favia ananas (pars), Oken, 1815, ' Lehrb. Naturg. Zool.' Abth. i. p. 67. 



Favia ananas, M .-Edwards & Haime, 1857, ' Hist. N at. Cor.' t. ii. p. 435 ; Duchas- 

 saing & Michelotti, 1861, ' Mem. Cor. Ant.' Mem. R. Accad. Sci. Tor. ser. 2, 

 t. xix. p. 352 ; Verrill, 1864, ' List of Corals,' Bull. Mus. Comp. Zool. vol. i. p. 48 ; 

 Duchassaing & Michelotti, 1866, 'Suppl. Mem. Cor. Ant.' Mem. R. Accad. Sci. 

 Tor. ser. 2, t. xxiii. p. 177 ; Duchassaing, 1870, ' Rev. Zooph. Ant.' p. 30 j Pour- 

 tales, 1871, ' Deep-Sea Corals,' 111. Cat. Mus. Comp. Zool. no. iv. p. 75. 



Astrcea ananas (pars), Lamarck, 1816, ' Hist. Nat. Anim. s. Vert.' t. ii. p. 260. 



