CORALLIFERI. 447 



which are at the summit of the projecting parts, as in Oculina, or at 

 the bottom of the cavities, as in Meandrina*. 



Agaricina. 



The Agaricinee are composed of laminae hollowed on one side only 

 by the valleys, which are themselves sulcatedf- 



It is thought that we may approximate to the Madrepores in gene- 

 ral, certain corals (Polypicrs) or the Sarcinula, Lam., composed of 

 cylinders, a section of which forms stars, by reason of the projecting 

 laminpe which traverse the interior J. When there is a solid axis in 

 the middle of these laminae we have Stylina. These corals are per- 

 haps as nearly related to the Tubiporse. 



MiLLEPORA, Lin., 



Where the stony portion is extremely various in form, and the sur- 

 face merely marked with little holes or pores, or even without any 

 aj^parent orifices. 



DisTicopHORA, Lam., 

 Where the more strongly marked pores are arranged on two sides of 

 the branches^. Of those in which the pores are equally distributed, 

 we distinguish 



MiLLEPORA, Lam., 

 Or Milleporae proper, which are solid, and variously ramous ||. 



When their pores are not apparent, as is sometimes the cAsc, they 

 are called Nullipora^, 

 Then we have the 



ESCHARA, Lam., 



Which are furnished with flattened, foliaceous expansions**. 



Retepora, Lam., 

 Which are Escharae, pierced with meshes ft- 



Adeona, Lamour. 

 Escharae borne on an articulated stem; some are entire, and others 

 pierced with meshes J J. 



* Mad. exesa, Sol. and Ell., XLtX, 3 ;— and the different Hydhophorte of Fis- 

 cher. 



t Mad. cucidlata, Sol. and Ell., XLII; — M. undata, Id., XL; — M. cotnplicafa, 

 Id., xli, 1, 2. 



X Mad. organum, L., Ann. Ac, I, iv, 6. 



§ Millepora violacea, Pall., Sol. and Ell., pi. XXVI, f. 3, 4, copied Encyc, Method., 

 Vers, pi. 481, f. 1. 



II Millepora alcicornis, Pall., Esper. I,v, 7, and Supp. I, xxvi; — Mill.aspera, Lam., 

 Esper, Supp., I, xviii ; — M. tmncata, Sol. and Ell., XXIII, f. 1 — S. 



^ Millepora informis, Ell., Corall., XXVIl, f. c;—M. calcarea, Sol. and Ell., 

 XXIII, f. 13; — M. cretacea, Id., lb., 9; — M. alga, Id., lb., 10, 11, 12. 



** Millepora foliacea, Ell. Corall., XXX, f. a; — Eschara lichenoides, Seb., Ill, c. 

 10 ■,—Esch. lohata, Lamour., add to Sol. and Ell., LXXII, f 9—12. 



ft Millepora cellulosa, vulgo, Manchette de Neptune, Ell., Corall., XXV, f. d, ; Dau- 

 bent., PI. Enl., No. 23, No. XXIII ;— .V. reticulata, Marsill., Hist. Mar. pi. XXIV, 

 f. 165, 166. 



XX Adeona grisea, Lamouroux, Sol. and Ell., LXX, f. 3 ; — Ad. follicolina, Id. 



For these genera as well as several others, established on consideration of but 



