TRIBE I. ASTR.EACEA. 
23 
Arrangement of the Species. 
Subgenus 1. Orbicella. Cells nearly circular, more or less prominent, 
not subdividing by growth, or rarely so ; stars with distinct limits formed by 
the coalescence laterally of the lamellse, and therefore cells appearing tubular 
and separated by interstices. 
I. CaUcles prominent, cells more ih 
36 or 48. 
1. A. Orb. radiata. 
*2. A. Orb. argus. 
*3. A. Orb. glaucopis. 
*4. A. Orb. patula. 
II. CaUcles more or less prominent, 
adult cell, 18 or 24. 
*8. A. Orb. hyades. 
*9. A. Orb. excelsa. 
*10. A. Orb. pleiades. 
*11. A. Orb. annularis. 
*12. A. Orb. stellulata. 
2 lines broad, lamellcE in adult cell, 
*5. A. Orb. curta. 
6. A. Orb. rotulosa. 
*7. A. Orb. coronata. 
less than 2 lines broad, lamellce in 
*13. A. Orb. stelligera. 
14. A. Orb. crispata. 
*15. A. Orb. microphthalma. 
*16. A. Orb. ocellina. 
Subgenus 2. Siderina. Cells not subdividing by growth, interstices flat, 
stars with limits along the middle of the interstices, and cells not appearing 
tubular; lamellse minute and crowded. 
*17. A. Sid, galaxea. 
Subgenus 3. Fiss/cella. Cells subdividing by growth and budding. 
A. CONVEX OR ROUNDED. 
a. Cellules of the stars in a transverse section decompound, lamellae even. 
I. CaUcles prominent. 
*18. A. speciosa. 
*21. A. pandanus. 
19. A. uva. 
*22. A. puteolina. 
20. A. ananas. 
*23. A. pallida. 
II. CaUcles immersed, n 
'idges someivhat sulcate or entire. 
*24. A. dipsacea. 
*30. A. fragilis (cellules sparing- 
*25. A. porcata. 
ly decompound.) 
*26. A. flexuosa. 
*31. A. tenella. 
*27. A. fusco-viridis. 
*32. A. magnifica. 
*28. A. virens. 
*33. A. filicosa. 
*29. A. echinata. 
