A. E. Verritt — Bermudian and West Indian Reef Corals. 149 



which I doubt, it should receive the variety name Lamarcki (E. and 

 H.) on account of its thin, pedicelled fronds and small calicles. 



A. frondosa (Duch. and Mich.) Quelch, is also a doubtful form, 

 which Quelch thinks distinct. According to Quelch it forms solid 

 crests ; the collines are irregularly arranged, close, and not acute. 

 The calicles have about 30 septa, seldom more. This seems to me 

 to be near Danai of Edw. and H.=cristata Dana (our var. b), but it 

 may not be the same as the type of D. and Mich. 



This common species and its varieties are found on the Florida 

 reefs and throughout the West Indies to South America and Colon. 

 From Colon I have received varieties a, b, d. They were all 

 found in shallow water, under similar conditions. None of these 

 forms have been found at Bermuda. A small form, near var. d, is 

 found at the Abrolhos Reefs, Brazil, and a small, more nearly typical 

 specimen near var. a, from Pernambuco, is in the Yale Museum. 



Agaricia purpurea (Les.) Dana. 



Agaricia purpurea Les., Mem. Mus. Hist. Nat. Paris, vi, p. 276, pi. xv, fig, 3, 

 a, b, c, 1820. Dana, Zooph., p. 340, 1846 (unifacial variety). 



? Mycedium Danai Duch. and Mich., Corall. Antill., p. [81], 1860 {non Edw. 

 and Haime). 



Plate XXVII. Figures 4, 4a, 4b. 



This species usually forms broad, thick unifacial fronds, gener- 

 ally attached near the middle or else partly encrusting. The fronds 

 may be flat or cup-shaped. The collines are usually narrow, acute, 

 short, and often irregular or reticulated. The calicles are large and 

 open, deep, angular, often isolated, and deeply sunken between the 

 sharp walls or collines. They are oblique and often so deep and 

 curved that the wide bottom cannot be seen. The septa are thin 

 and narrow, leaving a wide, open, central space, and wide spaces 

 between them ; there are usually 24 to 36, alternately very unequal. 

 (PI. xxvii, fig. 4.) 



In sections a small, solid, papilliform columella is present in some 

 calicles, and there are well formed tabular dissepiments in the thicker 

 parts, which extend quite across the calicles. The common wall is 

 very solid, but it has some radial, angular cavities in the thick basal 

 portion near the pedicel. The costre of the under side are slender, 

 pretty even, and regular. 



This differs so much from the several varieties of agaricites, 

 described above, that it seems probable that it is distinct. It is 

 remarkable for the large and very deep, open, angular calicles, sep- 

 arated by rather thin, acute walls, and for the tabulate dissepiments. 



