75 



arrangement, eight species, placed by Gmelin under this 

 genus, besides the fossil species radians and ramulosa,* are 

 removed, and no other genus proposed for their reception. 



The chief generic character of these animals, as derived 

 from their ascertained structure, is, that the animal sub- 

 stance contained in each tube so communicates with the 

 whole mass by an intercurrent organization, as to render it 

 one connected system ; and, by retaining the original ar- 

 rangement of the perspicacious Linnaeus, with a very small 

 change in his definition, the genus will be found sufficiently 

 distinct and comprehensive; and the several species, the 

 structure of which is known, will be characterized by the 

 different modes of organization by which this communi- 

 cation is effected. 



Tubipora. A stony polypifer formed by cylindrical 

 tubes, communicating laterally with each other. 



Sp. 1. T. musica. Formed by erect, cylindrical, parallel, and dis- 

 tinct geniculated tubes, containing an internal tubular orga- 

 nization, connected by small radiating tubuli passing through 

 the external tubes and the transverse plates, by which the 

 tabes are supported and united. 

 Recent. 



2. radians. With erect parallel tubes, including others, which, 



by radiating horizontally through the external tubes, connect 

 the whole. Org. Rem. vol. ii. p. 13, PL i. frontispiece. 

 Fossil. 



3. catwuloia. With erect, oval, parallel tubes, laterally porous, 



and placed in vertical laminze, which, by anastomosing, form 

 a chain-work. Amoen. Ac. Tab. iv. fig. 20. It is also re- 

 presented, Org. Rem. PI. iii. fig. 4, 5, 6. 

 Fossil. 



4. axillaris. With very short, distant, erect, cylindrical tubes, 



placed in the connecting angles of flexuous vertical laminae. 

 Millep. Serpens. Anioen. Ac. i. Tab. iv. fig. 26. 

 Fossil. 



* Organic Remains, vol. ii. p. 13, PI. i. p. 18, PI. iii. fig. 



