90 



classed together. Lamarck having separated all those la- 

 mellated polypifers which appeared to bear distinctive 

 generic characters, retained under the genus madrepore 

 those only which are not found in form of incrustation, and 

 whose substance is divided in plant-like lobes or branches, 

 with a surface muricated by the sharp projections from 

 stelliform, oblique, subcylindrical, tubular, and slightly 

 laminated cells, and by the finely porous and echinulated 

 interstices. 



1. Mad. palmata. . . . Mad. muricata. Esper. Supp. i. Tab. li. Ixxxiii. 



2. flabellum. . . . American Seas ? 



3. corymbosa. . . . Humph. Amb. 6. Tab. Ixxxvi. fig. 2. 



4. plantaginea. . . . Mad. muricata. Esp. Supp. i. Tab. liv. 



5. pocillifera. . . . Indian or South Seas. 



6. laxa South Seas. 



7. abrofanoides. . . . Mad. muricata, Sol. and Ellis, Tab. Ivii. 



8. cervicornis. . . . Seba. mus. 3. Tab. cxiv. fig. 1 . 



9. prolifera Esp. Supp. i. Tab, I. 



Seriatopora. A stony fixed polypifer, with thin and 

 rather cylindrical branches. 



The cells perforated, slightly lamellated, or ciliated 

 in their edges, and placed in rows, transversely or longi- 

 tudinally. 



This separation from madrepores is founded on the cells 

 being thus placed in rows, and having only their margins 

 set with very small plates, or rather hair-like points, instead 

 of plates projecting inwards. 



1. Ser. subulata Mad. seriata. Sol. and Ellis, Tab. xxxi. fig. 1, 2. 



2. annulata. . . . South Sea. 



3. nuda* 



Oculina. A stony polypifer, most frequently fixed; 

 ramose and dendroidal ; the branches smooth, spread, and 

 for the most part very short. 



The stars, some terminal, the others lateral and superficial. 



