TRIBE III. — MADREPORACEA. 
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' Forms of calicles (see plate 81) : 
I 1. Tuhiform^ cylindrical, figs. 2 < 2 , 3a; apex transverse, 8 a ; 
apex oblique, 3 5, 11c, 12 5, c, d] sometimes close appressed to 
i the branch, 3 a, 9 a, 8 a. 
2. Nariform (from the Latin for nose), triangular in profile, 
* with the upper side which contains the aperture, nearly at right 
j angles with the stem, 4a; tubo-nariform, 5a, 4 5. 
3. Cochlear if orm^ a short, stout, erect cylindrical calicle, with 
a broad apex and upper partly wanting, 10 a, 10 5. 
; 4. Dimidiate^ a tubular calicle bisected longitudinally nearly to 
its base, 7 a. 
5. Labellate or long-lipped, or in shape like a blade of a shovel, 
6 a, 5, c. — It passes into the dimidiate form. 
Arrangement of the Species. 
A. Horizontal or oblique foliate, without proper branchlets above. 
I. Calicles tubiform. 
1. M. palmata. 3. M. fiabellum. 
2. M. aloes. 4. M. cyclopea. 
II. Calicles labellate. {Surface of corallum covered with incipient conical 
branchlets.) 
5. M. conigera, 
B. Horizontal or oblique, with erect or ascending branchlets above, which 
form a clump with an evenly concave or convex top — vasiform or cespitose. 
I. Calicles thin labellate. 
6. M. efflorescens. 
7. M. cytherea. 
8. M. spicifera. 
9. M. hyacinthus. 
10. M. surculosa. 
11. M. millepora. 
12. M. prostrata. 
13. M. siibulata. 
14. M. convexa. 
II. Calicles quite thin ; round nariforn, or appressed-tubiformt 
1 5. M. aculeus. 17. M. tubicinaria (suffruticose). 
16. M. tenuis. 
III. Calicles stout, nariform or tubiform. 
18. M. paxilligera. 20. M. digitifera. 
19. M. nasuta. 21. M. globiceps. 
