Vol. 51.] AND PHYSICAL GEOLOGY OF THE WEST INDIES. 283 



Mus. Comp. Zool. vol. vii. pt. 1, pi. xii. figs. 4-6 ; Quelch, 1886, ' Reef Corals,' Zool. 

 ' Chall.'Exped. pt. xlvi. p. 179 ; Rathbun, 1888, ' Cat. Pontes,' Proc. U.S. Nat. Mus. 

 vol. x. (1887) pp. 356-361, pi. xvi., pi. xvii. fig. 2, pi. xviii., pi. xix. fig. 1 ; Rehberg, 

 1892, ' Abh. Geb. Nat.' Nat. Ver. Hamburg, Bd. xii. pt. i. p. 47. 



Porites flexuosa, Dana, 1848, ' Zooph. Explor. Exped. Wilkes,' p. 554, pi. liii. 

 fig. 6 ; M.-Edwards & Haime, 1851, ' Monogr. Porites,' p. 31 ; iid. 1860, ' Hist. Nat. 

 Cor.' t. iii. p. 176 ; Duchassaing & Michelotti, 1861, ' Mem. Cor. Ant.' p. 358 ; 

 iid. 1866, ' Suppl. etc' p. 191 ; Duchassaing, 1870, ' Rev. Zooph. Ant.' p. 32. 



Porites fiabellifor'mis, Lesueur, 1820, 'Polyp. Lamell.' M6m. Mus. Hist. Nat. t. vi. 

 p. 289 ; Deslongchamps, 1824, Encycl. M6th., ' Zooph.' p. 652 ; M.-Edwards & Haime, 

 1851, op. supra cit. p. 31 ; iid. 1860, op. supra cit. t. iii. p. 178 ; Duchassaing & 

 Michelotti, 1866, op. supra cit. p. 190 ; Duchassaing, 1870, op. supra cit. p. 32. 



Porites Solanderi, Duchassaing & Michelotti, 1861, op. supra cit. p. 359 ; iid. 

 1866, op. supra cit. p. 189 ; Duchassaing, 1870, op. supra cit. p. 32 ; Quelch, 1886, 

 ' Reef Corals,' p. 13. 



Porites Plumieri, Duchassaing & Michelotti, 1866, op. supra cit. p. 190, pi. x. 

 fig. 14 ; Duchassaing, 1870, op. supra cit. p. 32 ; Quelch, 1886, op. supra cit. p. 13. 



Porites macrocepliala, Duchassaing & Michelotti, 1866, op. supra cit. p. 189, pi. x. 

 rig. 15 ; Duchassaing, 1870, op. supra cit. p. 32. 



Porites conqlomerata (pars), Lamarck, 1816, ' Hist. Nat. Anim. s.Vert.' t. ii. p. 269 ; 

 id. 1836, ibid', ed. 2, t. ii. p. 434. 



Porites furcata, Lamarck, 1816, op. supra cit. t. ii. p. 271 ; Deslongchamps, 1824, 

 Encycl. Meth., ' Zooph.' p. 653 ; Blainville, 1826, Diet. Sci. Nat. t. xliii. p. 51 ; 

 Lamarck, 1836, op. supra cit. ed. 2, t. ii. p. 437 ; Dana, 1848, ' Zooph. Explor. Exped. 

 Wilkes,' p. 565 ; M.-Edwards, 1849, ' Regne Animal, Zoophytes,' Atlas, pi. 84 bis ; id. 

 & Haime, 1851, ' Monogr. Porites,' p. 25, pi. i. figs, l-l^ ; iid. 1851, ' Polyp. Paleoz.' 

 Arch. Hist. Nat. t. v. p. 143 ; iid. 1860, ' Hist. Nat. Cor.' t. iii. p. 174 ; Duchas- 

 saing & Michelotti, 1861, ' M6m. Cor. Ant.' p. 358 ; Verrill, 1864, ' List of Corals,' 

 p. 42 ; Duchassaing & Michelotti, 1866, ' Suppl. etc' p. 189 ; Duchassaing, 1870, 

 ' Rev. Zooph. Ant.' p. 32 ; Pourtales, 1871, 111. Cat. Mus. Comp. Zool. no. iv. p. 85 ; 

 id. 1880, ' Flor. Reefs,' Mem. Mus. Comp. Zool. vol. vii. pt. 1, pi. xii. fig. 7, pi. xvi. 

 figs. 13-20; Quelch, 1886, ' Reef Corals,' p. 13; Rathbun, 1888, 'Cat. Porites,' 

 pp. 361-364, pi. xv., pi. xvii. fig. 1 ; Ortmann, 1888, ' Syst. Verbr. Steinkor.' Zool. 

 Jahrb. Bd. iii. Svst. p. 157 ; Heilprin, 1890, ' Corals W. Gulf Mexico,' Proc Acad. 

 Nat. Sci. Phil. 1890, p. 305. 



Heliopora furcata, Blainville, 1830, Diet. Sci. Nat. t. lx. p. 357 ; id. 1834, ' Man. 

 Act.' p. 392. 



Porites divaricata, Lesueur, 1820, 'Polyp. Lam.' Mem. Mus. Hist. Nat. t. vi. p. 288 ; 

 Dana, 1848, 'Zooph. Explor. Exped. Wilkes,' p. 556; M.-Edwards & Haime, 1851, 

 ' Monogr. Porit.' Ann. Sci. Nat. Zool. ser. 2, t. xvi. p. 30 ; iid. 1860, ' Hist. Nat. Cor.' 

 t. iii. p. 178 ; Duchassaing & Michelotti, 1861, ' Mem Cor. Ant.' p. 358; iid. 1866, 

 ' Suppl. etc' p. 191 ; Duchassaing, 1870, ' Rev. Zooph. Ant.' p. 32. 



Porites recta, Lesueur, 1820, op. supra cit.]). 288, pi. xvii. fig. 16 ; Deslongchamps, 

 1824, Encycl. Meth., ' Zooph.' p. 651 ; Dana, 1848, ' Zooph. Explor. Exped. Wilkes,' 

 p. 556. 



Distribution. Recent : West Indies : Bermudas ; Bahamas ; Florida ; Vera Cruz ; 

 ? Red Sea & Indian seas. Fossil : Barbados : Low-level Reefs near Bridgetown 

 (Pranks & Mitchinson Coll.). 



Notes on Synonymy. — According to the British Association rule 

 that the same word is not to be used as the generic and specific 

 names of the same animal, this species cannot be called Porites 

 porites (Linn.). The specific name has therefore to be dropped, and 

 the next one taken. P. clavaria and P. furcata were proposed at 

 tho same time, but, as P. clavaria comes first and has been generally 

 regarded as the most typical, it is best to accept that. 



There has been an universal consensus of opinion since the days of 

 Lamarck that P. clavaria and P. f areata are distinct. Nevertheless, 

 I cannot but feel that it is necessary to merge them. Their dis- 

 tinction has been based on three characters : firstly, the height of 

 the epitheca ; secondly, the shape of the ends of the branches ; thirdly, 

 the structure of the calices. There is a fine series of specimens of 

 both forms in the Museum of Comparative Zoology at Cambridge, 

 Muss., many of which were labelled by Pourtales. An exami- 

 nation of these shows that the three characters are each of them 



