5G2 
POLYPI. 
Oculina virginea. — The Virgin Oculina. 
Plate CIV. fig. 15. 
Greatly branched, and tortuous ; stars scattered, immersed, or 
prominent, and formed by lamellae. Inhabits the Indian seas. 
Genus 14—SER.IATOPORA.— Lamarck. 
Generic Character. —Fixed, stony, and in slender, subcylindri- 
cal branches; cells perforated, lamellar, margin appearing cili¬ 
ated, and arranged in a lateral or longitudinal series. 
Seriatopora subulata. —The Subulate Seriatopora. 
Plate CIV- fig. 18- 
Diffuse, with many slender branches ; stars in a longitudinal 
series. 
Genus 15.—MADREPORA.— Lamarck. 
Generic Character. —Fixed, somewhat dendritic, and branch¬ 
ing ; the surface exhibiting on all sides projecting scattered cells, 
which are distinct, cylindrical, tubular, scarcely stelliferous ; in¬ 
terstices porous; with narrow laminae. 
Madrepora simplex. —The Simple Madrepore. 
Plate CIV. fig. 21. 
Greatly depressed, and mushroom-shaped. Inhabits the In¬ 
dian ocean. 
Genus 17. — PO RITES. Lamarck. 
_ Generic Character _Stony, branched, or lobed and obtuse, 
fixed at the base ; surface stelliferous ; stars regular, somewhat 
contiguous, superficial or excavated, with either imperfect mar¬ 
gins or none ; filamentous laminae sharp and pointed. 
Porites clavaria. —The Club-Shaped Porites. 
Plate CIV. fig. 22. 
Subclavate, and obtusely compressed ; stellae broad, flat, and 
contiguous. Inhabits the American seas. 
Genus 18.—ASTREA.— Lamarck. 
Generic Character. —Fixed, stony, and incrusting marine sub- 
tances, forming hemispherical or globular masses, which are 
