A. E. Verrill — Bermudian and West Indian Reef Corals. 129 



The calicles generally separate rather quickly in all the forms, and 

 a large part of them are circular and irregularly elliptical, or hour- 

 glass shape, owing to imperfect division. The size of the calicles, even 

 when circular, is quite variable, but is mo&tly between 12 and 18 mm ; 

 the elliptical ones are often 25 to 30 mm long. 



The septa are generally very thin, deeply lacerately toothed, the 

 longer teeth being on the wider and rounded upper portion. They 

 are usually rather openly spaced, about 9 or 10 wide ones to a centi- 

 meter, with as many very narrow or rudimentary alternating ones. 

 In some specimens there are 12 large septa to a centimeter. 



In the extreme form, var. confertifolia (fig. xxii, fig. 1), there are 

 16 larger and 16 smaller, very thin septa to a centimeter. 



The columella is generally well developed, very porous, composed 

 of numerous rough, irregular trabecular processes, with free spines 

 on its surface. But sometimes it is coarsely, rudely trabecular and 

 very loosely arranged, or it may be almost lacking. 



The costae are usually rather thin and not much elevated, but they 

 are covered with numerous, rather close, sharp, elongated, often 

 recurved spinules. These costal spines are very characteristic for 

 this species, but in some specimens they become fewer, more irregu- 

 lar and less elongated, on some parts at least. 



Brazil, from Pernambuco to Abrolhos Reefs ; Victoria ; Porto 

 Seguro, Bahia, Mar Grande, etc., common, — C. F. Hartt ; R. Rath- 

 bun. According to Mr. Rathbun the clusters are sometimes 2 feet 

 across. 



Var. confertifolia Ver., now 



Plate XXII. Figure 1. 



The type of this variety is much more delicate than usual, with 

 much more numerous, thinner, and crowded septa (about 16 larger 

 and 16 smaller septa to the centimeter) ; they are covered with long, 

 slender, sharp teeth. The columella is well developed and finely 

 trabecular. The costae are small, close, and crowdedly spinose, with 

 small acute spinules, much as in the typical form, but smaller. 



The corallites are short, pretty closely crowded, circular, elliptical, 

 and some ai*e irregular and rather smaller than usual. They are 

 united for onlv a short distance, or not at all, bv exotheca. 



Pernambuco, Brazil, — Derby and Wilmot, 18*70. No. 4551. 



Trans. Conn. Acad., Vol. XI. 9 November, 1901. 



