CORALLIFERI 415 
nished with Polypi in a portion of its length. The bone is usually 
small and the Polypi large. We can trace the prolongations of in- 
testines into the common stem in these compound Zoophytes much 
‘more easily than in any of the others. 
One species that inhabits the Mediterranean—Pennatula cy- 
nomorium, Pall., Miscell. Zool., XIII; Alcyonium epipetrum, 
Gm.; Rap., Ac. Nat. Cur., XIV, p. 2, pl. xxxviii, 1, is fre- 
quently more than a foot in length, thicker than the thumb, 
and remarkable for the phosphoric light that it diffuses(1). 
Finally, in the 
OMBELLULARIA, Cuv. 
We remark a very long stem, supported by a bone of similar 
length, and terminated at the summit only by a bundle of Polypi(2). 
Small, porous and stony bodies, which naturalists have 
thought may be approximated to the Millepora, are found 
among fossils and in the ocean. If they were enveloped by 
a rind or bark containing Polypi, they would be movable Co- 
ralliferi, and should rather be placed near the Pennatule. 
Such are the 
Ovutirrs, Lam., which have the form of eggs, hollow, and fre- 
quently perforated at both ends: the Lunutires, which are orbicu- 
lar, convex, striated, and porous on one side, and concave on the 
other: and the Orsutires, that are orbicular, flat, or concave, 
porous on both sides or on the edges. If the Dacrytopora be free, 
as is the opinion of Lamarck, it will also belong to this subdivision; 
it is a hollow ovoid, open at both ends and with two envelopes, both 
_ perforated by meshes like the Retepora(3). 
(1) Add Pennatula phallovdes, Pall., Misc. Zool., XIL, 5—9;—Pennat. stellifera, 
Mull., Zool. Dan., XXXVI, 1—3. 
(2) Pennatula encrinus, Ell., Corall., XXX VII, a, b, c. 
N.B. The Pennatula filosa and the Pennatula sagittata are parasitical animals 
of the genus Lernea (Pennetta, Oken), and not Pennatule. The Pennat. sagitta, 
Esper, Pennat., pl. v, is very different from that of Linneus, and is perhaps a 
Nepthys. 
(3) The Rétéporite, Bosc., Journ. de Phys., June 1826. For these genera of 
little free Millepora, see also the work of Lamouroux just quoted. 
