118 ^4. 2£ Verrill — JBermudian and West Indian Beef Corals. 



genus. The infolding of the margin is often delayed till the calicle 

 is 25 to 4() mm across. 



But frequently the first outfoldings of the margin begin much 

 sooner than usual to form secondary folds of the same nature, before 

 the first series of calicles is fully formed. This gives rise to the 

 early formation of a much larger number of calicles, some of which 

 may long remain incomplete and united in series. For the same 

 reason the calicles in such a coral will be, for some time, smaller in 

 size than those that divide more slowly, thus giving them a very 

 different appearance. But both conditions may exist at the same 

 time on some specimens, and many irregularities constantly occur. 

 (See pi. xvii, figs. 5, 6.) Some species, however, normally divide 

 more rapidly than others. (PI. xx, fig. 1.) The outfoldings of the 

 margin may not much affect its regular circular outline, as in pi. 

 xvii, figs. 1, 2, (I. fragilis). But in other cases they may be eo 

 extensive as to produce a deeply lobulated outline, when seen from 

 below, as in pi. xvii, fig. 3, {I. fragilis). Large specimens of either 

 species (see pi. xvii, figs. 5, 6 of fragilis) generally have a large 

 number of calicles, irregularly arranged, many of them isolated, hut 

 mostly in short series. 



Resorption of parts of the walls and septa or of the entire thick- 

 ness of the collines frequently takes place, and thus alters the appear- 

 ance. In some cases this results in breaking up the collines into 

 detached portions or isolated columns. This I have seen in I. fragilis. 



The genus is chiefly, or perhaps entirely, American. The simple 

 form described as /. australis, first from Australia, was considered 

 the type of a special genus, Homophyllia, by Bruggmann, 1*7 7. 

 The species described by Klunzinger from the Red Sea as I. ery- 

 thrma appears to me to belong rather to TJlophyllia or Mussd. 



Isophyllia dipsacea Dana. Eose Coral. 



Mussa dipsacea Dana, Zooph., p. 184, 1846. 



Symphyllia dipsacea Edw. and Haime, Corall.. ii, p. 373, 1857. 



Isophyllia dipsacea Verrill, Bull. Mus. Comp. Zool., i, p. 49, 1864 ; Poni'taK-s, 



Deep Sea Corals, p. 71. 1871 ; Florida Keefs, pi. vii. figs. 1-8, 1880. 

 Isophyllia australis (pars) Edw. and Haime, Corall.. ii. p. 375 (young), l s ~>i. 

 .' Symphyllia anemone + S. comferta + S. aglos + S. helianthus+ S. Tkomusiana + 



S. aspera + S. cylindrica + S. Knoxi + S. verrucosa (abnormal) Duch. and 



Mich., Corall. Antill., pp. 71. 72, 1860. 

 t lAthophyllia argemone + L. cylindrica Duch. and Mich., op. cit., p. 68, pi. ix 



fig. 121, pi. x, fig. 15, pi. ix, figs. 17, 18, 1860, (young). 

 Isophyllia australis + cylindrica + Knoxi t Lithophi/llin Cuboisis + L. hivera 



(nun Pallas) + L. argemone Quelch, Voy. Chall., Zool., xvi, pp. 10. 11, 12, 



pp. 83-86, 1886. 



