TRIBE I. ASTRB5ACEA. 
17 
4. Ctenophyllta profunda [Dana ). — Corallum with the ridges entire. 
Gothic, (4 lines wide), gyri 5 to 6 lines broad, fossae very deep (nearly i an 
inch), lamellsR rather thin. 
Plate 14, fig. 16, outline of lamellae and trench. 
Genus III.— MUSSA.— Oken. 
Large Astraaidge, segregate, also explanato-glomerate ; tenta= 
cles nimieroiis, unequal, tlie inner tumid. Coralla calicularlj 
branched or explanato-glomerate; calicles very stout, subturbi- 
nate, with orbiculate or lobed cells, sometimes very broadly 
compressed with the cells long meandering ; exterior stoutly 
lamello-striate and echinatodentate ; lamellae coarsely dentate or 
gash-toothed, unequally exsert. 
I. Caliculato-ramose ; cells simple or but little lobed. 
1. Mussa fastigiata [Ellis,) Dana. — Fastigiate ; disks usually nearly 
circular. Corallum with the branches stout ; calicles remotely ribbed-angular, 
not dentato-echinate, f to 1 inch broad (rarely i an inch), lamellse scarcely 
toothed ; subacute at apex. 
West Indies. Ellis. 
2. Mussa carduus [Pallas,) Dana. — Very large; disks nearly circular. 
Corallum having the calicles very stout (2| to inches broad), very long tur- 
binate, nearly circular; exterior every where (above and below) strongly lam- 
ello-striate and sharp serrate ; cell concave, margin rounded, lamellae coarsely 
serrato-dentate, 
Plate 8, fig. 8, section of cell showing the outline of lamellae. West 
Indies. 
3. Mussa angulosa [Pallas,) Oken. — Large ; disks usually nearly circular, 
sometimes lobed. Corallum large, branches short ; calicles suborbicular, from 
1 to li inches broad, often lobed (sometimes with 4 to 5 lobes), exterior every 
where lamello-striate, and dentato-echinate ; cell with a rounded margin ; 
lamellsB thin, regularly serrato-dentate. 
Plate 8, figure 4, section of cell showing the outline of lamellae. — West 
Indies. 
4. Mussa corymbosa [Forskal,) Dana. — Fastigiate ; pale fuscous, disk 
usually nearly circular, gold-yellow, centre smooth, margin tumid papillose, 
papillae bursiforrn, scarcely a line high, tentacles small. Corallum erect, fasti- 
giate ; calicles unequal, 1 to li inches broad, subturbinate, often compressed 
