A. E. Verrill—The Bermuda Islands; Coral Reefs. 245 
It differs from the preceding mainly in having a larger number of 
radial ‘septa (about 48), which are less unequal in size and thickness, 
and in having somewhat larger calicles, which are commonly dis- 
tinctly bounded by an intervening angular ridge, so that they often 
appear hexagonal or polygonal. 
The living polyps of this, apparently in full expansion (fig. 100), 
as seen by the writer, had small, tapered, blunt or knobbed tenta- 
cles, in four or five rows, the inner ones largest ard bilobed, situated 
about midway between the mouth and margin of the disk. The 
colors were about as in the preceding species.* 
It is an abundant West Indian reef coral, where it often forms 
solid hemispheres 3 to 5 feet in diameter. 
Agaricia fragilis Dana. Hat Coral. Shade Coral. Figs. 101, 101a. 
Agaricia fragilis Verrill, these Trans., xi, pp. 142, 181, pl. xxvi, figs. la-1ld, 
1901; The Zoology of Bermuda, i, article 11, pp. 142, 181, same plate. 
Mycedium fragile of many authors. Pourtales, in L. Agassiz, Florida Reefs, 
pl. xi, figs. 1-10, young; pl. xiii, figs. 1-5; pl. xiv, figs. 1-9, details. 
101 
10la 
rf 
Figure 101.—Agariciu fragilis, a specimen with two primary calicles, probably 
due to two young specimens growing together; about % nat. size. Phot. 
ASH. 
Figure 101a.—The same; living polyps at and near the margin, apparently fully 
expanded, and showing the minute tentacles. Drawn by A. H. V., from a 
sketch by the author. Enlarged. 
14, a, b, c), and of which he figured the polyps, is not of this genus. It is an 
astrean coral with about 36 short tentacles, in two submarginal series. If I 
understand his description of the coral, which is rather ambiguous, it has a 
