A. E. Verrill — JBermudian and West Indian Reef Corals. 91 



distinct species. The differences noticed are due to slight variations 

 in growth, and especially to the greater or lesser crowding of the 

 calicles. Sometimes the intervening spaces are very narrow; in other 

 specimens, and more commonly, they are rather wide. The calicles 

 may be circular, angular, or elliptical. The extreme forms occur asso- 

 ciated together in tide-pools at the Bermudas, but intermediate 

 specimens also occur in the same places. In life, the soft parts 

 a^ree in color and structure. 



My figures (pi. xiii, figs. 1, 2) are from jjhotographs of two Ber- 

 muda specimens, found together. They show nearly the extreme 

 forms of variation. The color of the soft pai'ts, in life, is light 

 yellow. 



This coral is common on the Florida Reefs, and throughout the 

 West Indies in shallow water. It is also abundant at the Azores. 

 (t. Quelch.) It never becomes large. 



Favia gravida Ver. 



Far in gravida Verrill, these Trans., i, p. 354, 1868. 



Fa via conferta (pars) Vaughan, op. cit. , pp. 39, 40, 1901 (non Verrill). 



Plate XIII. Figure 3. 



This Brazilian species is nearly allied to F. fragum of the West 

 Indies. I do not think it is so closely related to M. conferta as 

 Vaughan supposes, for he has united the two forms under the latter. 

 (See p. 84.) I have never found mseandriniform calicles or valleys 

 as in the latter, and the septa, columella, and sections of the Avails are 

 different. 



I have here figured one of the types. 



Abrolhos Reefs, Bahia and Pernambuco, coll. C. F. Hartt ; R. 

 Rathbun. 



Favia leptophylla Ver. 



Favia leptophylla Verrill, these Trans., i, p. 353, 1868. 



Plate XIII. Figures 4, 5. 



This species is very unlike any of those forms related to F. 

 fragum. It has double walls and vesicular exotheca between the 

 calicles. The proper walls are thin, continuous; those of adjacent 

 calicles are separated by a loose, vesicular structure, with thin dis- 

 sepiments. The septa are rather few, very thin with rather promi- 

 nent summits. This species produces some intermural buds, but it 

 increases mainly by fission. 



The photographs here reproduced are from the original type, now 

 in the Museum of Yale University. 



Abrolhos Reefs,- Brazil, coll. C. F. Hartt. 



