TRIBE I. ASTR.EACEA. 
13 
Genus IV. Manicina. Calicularly branched or explanato-glomerate ; cells 
lar^e, meandrine ; lamellse very even and numerous, and neatly denticulate, 
rounded above. 
Genus V. Caulastr^a. Calicularly branched; cells small (hardly ex- 
ceeding half an inch), concave, lamellse unequally exsert, nearly entire ; 
branches nearly cylindrical, calicles not turbinate. 
Genus VI. Tridacophyllia. Cells large, septa thin foliaceous, prominent, 
cristate. 
Genus VII. Astrjsa. Glomerate; cell nearly or quite circular, rarely 
lobed. 
Genus VIII. Meandrina. Glomerate, not stipitate ; cell a narrow mean- 
dering trench (trench not exceeding the fourth of an inch in breadth). 
Genus IX. Monticularia. Glomerate; no distinct cells; surface of co- 
ralla covered with small lamello-radiate cones ; internal texture very cellular, 
III. Coralla explanale or foliaceous. 
Genus X. Phyllastrjea. Erect, calicles large and distinct, affixed later- 
ally to the foliaceous corallum. 
Genus XL Merulina. Spreading-foliaceous or ramose; surface covered 
with oblique lamellar ridges or lamello-radiate prominences, with shallow 
trenches or cells between ; internal texture very compact. 
Genus XII. Echinopora. Foliaceous or ramose ; surface finely echinula- 
to-striate, calicles small, nearly hemispherical and echinulate. 
Genus I— EUPHYLLIA.^— Dana. 
Quite simple or segregato-gemmate, rarely free; zoophytes 
hemispherical. Tentacles oblong, subequal. Coralla having 
the calicles subturbinate, either circular or much compressed, 
sometimes meandering; lamellae nearly or quite entire; cell 
verj^ narrow at bottom. 
I. Quite simple Euphyllise. 
1. Euphyllia pavonina (Lesson,) Dana. — Solitary, free, cuneiform, semi- 
circular above in outline; tentacles numerous, stout, three-quarters of an inch 
long, subequal. Corallum below acutely carinate, edge either straight or form- 
ing an obtuse angle at centre, at middle a small pedicel ; exterior smooth, 
scarcely plicate, radiately substriate ; cell two inches long, and one broad at 
the aperture, very deep, lamellse not exsert, sub denticulate. 
* From £u, well or handsome, and (pvllov, leaf, alluding to the neat entire la- 
mellse of the cells. 
