94 A. E. Verrill— Hernia dian and West Indian Reef Corals. 



Orbicella annularis (Ellis and Sol.) Dana. Star Corals. 



Madrepora astroites Pallas, Elench. Zooph., p. 320, 1766 (not of Linne, ed. x. 



p. 796, which was a palaeozoic fossil, nor of ed. xii). 

 ft Madrepora acropora Linne, Syst. Nat., ed. xii, p. 1276, 1766. (Probably 



not this species, perhaps a Solenastrcea, but indeterminable.) 

 Madrepora annularis Ellis and Solander, Nat. Hist. Zooph., p. 169, pi. liii, 



fig. 1, 2, and Madrepora faveolata, p. 166. pi. Iiii, figs. 5, 6, 1786. 

 ft Madrepora acropora Esper, Pflanzenth., Fortsetz., i, p. 21, pi. xxxviii, 1797, 



(non Linne, Syst., ed., xii, p, 1276.) 

 Astrea annularis Lamarck, Hist. Nat. Anim. s. Vert., ii, p. 259, 1816. 

 Astrea annularis Laruouroux, Exp. Meth. Genres de Polyp., p. 58. pi. liii, 



figs. 1, 2, and Astrea faveolata, p. 58, pi. liii, figs. 5, 6, 1821. 

 Astrea (Orbicella) annularis Dana, Zoophytes U. S. Expl. Exp., p. 214, pi. x, 



fig. 6, and f A. (O) stellulata, p. 215, pi. x, fig. 7, (variety,) 1846. 

 Heliastrcea annularis Milne-Edwards and Haime, Hist. Nat. Corall., ii. p. 473; 



and f Heliastraia acropora, p. 477, 1857. 

 Heliastrea annularis ; + H. acropora ; + H. Lamarcki Duchassaing and Micbel- 



otti, Mem. Corall. Antilles, p. 352, [76], 1861 (t. Vaughau from types, non II. 



Lamarc/, ana E. and H.). 

 Orbicella annularis Verrill, Proc. Boston Soc Nat. Hist., ix, p. 33, 1862, rate 



of growth. 

 Phylloccenia sculpta + P. limbata + Cyphastraea costata (pars) + Astr&a Barba- 



densis Duucan, Quart. Journ. Geol. Soc. London, xix, pp. 432-444, pi. xv. 



figs. 6, 6a, 1863, all fossils, (t. Vaughan from types). 

 Plesiastrcea ramea Duncan (fossil), op. cit., xx, p. 39, 1864 (t. Vaughau ). 

 Orbicella annularis Verrill, Bull. Mus. Comp. Zool., i, p. 48, 1864; Pourtales, 



Flor. Eeefs, Cor., Mem. Mus. Comp. Zool., vii. No. 1. pi. iv, figs. 1-10, 1880. 

 Orbicella annularis A. Agassiz, Bull. Mus. Comp. Zool., xx, No. 2, p. 61. pis. 



i, ii, 1890, rate of growth. Verrill, these Trans., x, p. 553, 1900. 

 Orbicella acropora. (pars) Gregory, Quart. Jour. Geol. Soc. Lond., Ii, p. 272 



(now Linne,) ; + Cyphastra:a costata, p. 274 ;+ Echinopora Franski, p. 274. 



pi. xi, figs. 2a, 2b, 1895, (teste Vaughan from types). 

 Orbicella acropora Vaughan, Bull. Mus. Comp. Zool., xxviii, No. 5, p. 275. 



1899; Samml. Geol. Eeichs-Mus., ii. p. 22, 1901, (not of Gardiner, 1899). 



Plate XV. Figure 1. 



This common and well known species was admirably figured by 

 Professor L. Agassiz in the plates of Florida Reefs, published by 

 Pourtales, L880. 



It shows considerable variations in the size of the calicles; in the 

 extent to which they are crowded together ; in the prominence of 

 their borders above the intervening exotheca : in the prominence *>i' 

 the septa above the walls ; and in the extent to which the small 

 septa of the third cycle are developed. I>;it yet these variation-, so 

 far as I have seen, never go so far as to render difficult the recogni- 

 tion of the species, unless the specimens are badly worn. 



