566 
POLYPI. 
depressed, branched expansions, sometimes free, at others form¬ 
ed like net-work; the polypilerous cells on one side only, at the 
upper or internal surface of the mass. 
Retepora cellulosa .— The Cellular Retepora. 
Plate CV. fig. 1. 
Flattened, thin, greatly undulated; with elliptic cells. Inha¬ 
bits the Indian ocean. 
Genus 44. — ESCHARA.— Lamarck. 
Generic Character .—Nearly stony, and not flexible, with de¬ 
pressed lamellary fragile expansions, extremely porous interiorly, 
entire or divided; cells of the polypi arranged in fives on both 
sides. 
Eschara foliacea. — The Foliated Eschara. 
Plate CV. fig. 4. 
With numerous, fiexuous, coalescing laminae; pores small, 
round, and separate. Inhabits the European seas. 
Genus 47.—TUBULIPORA.— Lamarck. 
Generic Character. — A parasitical or incrusting mass, pro¬ 
vided with submembranous cells, disposed in clusters, or set in 
a series, and free for the most part; the cells elongated, regu¬ 
lar in their shape, and tubular, with an orbicular aperture, 
and rarely toothed. 
Tubulipora transversa .— The Transverse Tubulipora. 
Plate CV. fig 25. 
White within ; tubular cells diposed in tranverse rows, united 
at their base. Inhabits the Mediterranean sea. 
Genus 48.—FLUSTRA.— Linnaeus. 
Generic Character _Somewhat stony, submembranaceous, 
' and flexible, frondescent, on a thin crust, consisting of contigu¬ 
ous cells, set in many regular series, on one or both surfaces ; 
cells sessile, short, oblique, with a terminal, irregular, frequently 
dentated, or ciliated margin. 
