POLYPS AND CORALS. 19 



genera more recently referred to other classes, and espe- 

 cially the Tabulate corals, which were included by Milne 

 Edwards and Haime, but which, according to the observa- 

 tions of Prof. Agassiz, who has seen the Polyps of Mille- 

 pora\ belong among the HYDEOIDEA. This genus, however, 

 was not united with the group of Zoanthaires by Blainville, 

 but with the Bryozoa or Polypoid Mollusks. 



Exclusive of the exceptional genera, this order corres- 

 ponds to the great genus Madrepom of Linnaeus, Pallas, El- 

 lis, Esper and other writers of the last century ; to the sec- 

 tion Polypiers lamelliferes of Lamarck 2 and Lamoroux 3 ; 

 to the group of Zoahthaires pierreux of Blainville 4 ; to part 

 of the suborder Actinaria of Dana 5 , Agassiz 6 and others; 

 and to the third suborder of Zoanthairia, named MADEEPO- 

 EARIA, in the works of Milne Edwards and Haime 7 . The 

 latter arrangement I have adopted in a former paper 8 . 



This order has been sufficiently characterized for my 

 present purpose in the Synopsis of the Classification 9 , as 

 well as its subdivisions and principal families. 



SUBOKDEB, MADKEPORACEA Dana, pars. 

 FAMILY, MADREPORID^E Dana. 



MADREPORA TUEGIDA Verrill, nov. sp. 



The corallum consists of a cluster of thick, irregular 

 branches arising from a large massive base. The branches 

 are short and turgid, rounded and elevated at the ends, or 



1 Contributions to the Nat. Hist. U. S., Vol. III., page 61. 

 2Histoire des Animaux sans vertebres, t. II., 1816. 



3 Exposition methodique, 1821. 



4 Dictionnaire des Sci. naturelles, 1830, and Manual d' actinol., 1834. 



5 Zoophytes of the U. S. Expl. Exp., 1846. 



6 Contributions to the Natural Hist, of the U. S. Vol. I, p. 151, 1857, 

 Vol. III., p. 60, 1860. The Group Actinaria of Dana is here considered an 

 order parallel with Alcyonaria. 



7Histoire Naturelle des Coralliaires, Vol. n, p. 4, 1857. 



8 Revision of the Polyps of the East Coast, U. S. in Moiuoires Boston 

 Soc. Natural History, Vol. I, page 14, 1864. 



9 These Proceedings, Vol. IV, p. 145, 1865. 



