TRIBE III. MADREPORACEA. 491 



Arrangement of the Species. 



I. Short tubiform calicles, more or less angular, surface not papillose. 



*1. M. gemmulata. *3. M. caliculata. 



*2. M. lichen. 



II. No distinct calicles ; surface of the coralla papilloso-asperate. 



a. Free foliaceous or subramose. 



*4. M. palmata. *9. M. hispida. 



5. M. compressa. 10. M. foliosa. 



*6. M. crista-galli. *11. M. expansa. 



*7. M. spumosa. *12. M. grandifolia. 



8. M. circumvallata. 



b. Glomerate, incrusting, but not subramose (except becoming so by incrusting other 

 bodies). 



*13. M. effusa. *16. M. nodosa. 



14. M. stilosa. *17. M. scabricula. 



15. M. venosa. 



HI. Cells immersed ; surface of the coralla very uneven ; but not regularly papillose. 

 *18. M. incrassata. *19. M. erosa. 



IV. Cells immersed ; surface of the coralla not spinuloso-asperate ; interstitial spaces 

 prominent, or with rounded verrucos or long rugse. (Montiporae of Blainville.) 



*20. M. capitata. 24. M. verrucosa. 



21. M. nudiceps. *25. M. tuberculosa. 



*22. M. lima. *26. M. planiuscula. 



23. M. papillosa. 



V. Cells immersed, situated at the bottom of deep circular pits; surface of the coralla 

 not verrucose or papillose. 



*27. M. foveolata. 



VI. Cells superficial, immersed, surface of the coralla evenly smooth, zoophytes 

 branched. 



*28. M. digitata. *29. M. tortuosa. 



I. Manoporce caliculatce. 



1. MANOPORA GEMMULATA. 



M. explanata, contorto-foliacea, Gemmiporce affinis, cespitosa ; foliis 

 11^'" crassis, caliculis sparsis, breviter subtubiformibus, cellis optime 

 I2-radiatis, paulum ellipticis, centra ad fundum brevissime lineato ; 

 superficie externa levi, non rugata. 



