A. E. Verrill—The Bermuda Islands; Geology. 141 
Fragments of corals are usually few in number, even in the 
vicinity of the reefs. The most common form is the slender branched 
hydroid coral, Millepora aleicornis (tig. 36 and pl. xxx a), which is 
abundant on all the reefs and is easily broken. Of the true corals, 
fragments of the slender branched Oculina diffusa (fig. 36a) are 
occasionally found, and in some localities the thin edged shade-coral, 
Agaricia fragilis, occurs in the form of thin fragments, Fragments 
of the more solid or massive genera, such as Porites, Mussa, Maan- 
dra, Orbicella, etc., are rare in the mud and sand, even near the 
reets. 
36a 366 
Figure 36.— Millepora alcicornis, branches, ?4 natural size. 
Figure 36a.—Oculina diffusa, branch with expanded polyps, natural size ; }, 
the same, more enlarged. After Agassiz. 
Figure 36b.—-Schizoporella Isabelliana, group of cells, much enlarged. 
Bryozoa of several kinds are often met with in some localities. 
One of the most common forms is a thin encrusting species of 
Biflustra, which grows abundantly on the stems and fronds of float- 
ing Sargassum. Another common species is Jdmonea atlantica 
(fig. 36c), which grows abundantly on the reefs in slender branched 
forms with tubular calicles. Some larger or more solid foliaceous 
species also occur not infrequently. Among these is a species that 
at first forms thin crusts on rocks and dead corals, but later often 
becomes massive, or has tubular, pink-tipped branches (360). 
In shallow water near the shores ‘land-shells are rather common in 
the sand. Among those found were Pwcilozonites bermudensis, P. 
circumpfirmatus, Polygyra microdonta, Subulina octona, Rumina 
decollata, Helicella ventricosa, Helicina convexa, Truncatella cari- 
Biloculina bulloides, B. ringens, etc. For much longer lists of the Bermuda 
Foraminifera, see Woodward, Journal New York Microscopical Society, 1885, 
p. 147, and Brady, Voyage of the Challenger, Zoology, vol. ix, with a volume 
of plates. Most of the species are described and figured by the latter. The thin 
circular and subcireular disks of Orbitolites, Orbiculina and Peneroplis are 
among the largest and most common forms. For fossil species, see chapter 24. 
Trans. Conn. Acap., Vou. XII. 10 Frpruary, 1906. 
