91 



Although ramified and dendroidal, like the madrepores, 

 the oculinae are distinguishable by their substance being 

 solid, smooth, hardly at all porous, and their stars not 

 numerous. 



1. Oc. virginea. . . . Mad. virginea. Sol. and Ellis, Tab. xxxvi. 



2. — hirtella. . . . Mad. hirtella, Sol. and Ellis, Tab. xxxvii, 



3. — diffusa. . . . American Sea. 



4. — axillaris. . . . Sol. and Ellis, Tab. xiii. fig. 5. 



5. — prolifera. . . . Sol. and Ellis, Tab. xxxii. fig. 2. 

 b\ — echidnea. . . . Mad. rosea. Esp. 1. Tab. xv. 



7. — infundihidifera. 



8. — fiahelliformis. . . . Seba Mus. 3. Tab. ex. fig. 10. 



9. — rosea. . . . American Ocean. 



CORTICIFEROUS PoLYPIFERS. 



Phytodial or dendroidal, composed of two sorts of dis- 

 tinct parts ; one a solid, central axis, and the other a fleshy 

 incrustment, which covers it, and contains the polypes. 



The axis is full, inorganic, either horny, or in part or en- 

 tirely stony. 



The polypiferous incrustment constitutes," after its re- 

 moval from the water, a corticiform celluliferous envelope, 

 more or less friable. 



Cor allium. — A fixed polypifer, dendroidal, not articu- 

 lated, rigid and corticiferous. 



The axis caulescent, ramose, stony, solid, and striated 

 on the surface. 



The cortical part, whilst living, is soft, fleshy and polypi- 

 ferous ; after drying it is hardened and porous, with octo- 

 valved cells. 



The propriety of- allotting to this substance a distinct 

 genus must be evident ; it is not articulated, therefore is not 

 an Isis, with which Linnaeus had blended it; and its stony 

 axis will not permit its being placed among the Gorgonia, 

 as proposed by Solander. 



1. Cor. ruhrum Isis nobilis, Lin.; Gorgonia nobilis, Sol. and 



Ellis, Tab. xiii. 



