74 



subsequent genera are too important not to be particu- 

 larized; since by an attention to such distinctions fossil 

 substances may be traced back to recent analogues little 

 suspected. At PL ix. fig. 12, is the representation of, 

 apparently, a minute frondescent fossil millepore, from 

 Chippenham. 



Favosites. A stony, simple polypifer, in various forms, 

 composed of parallel, prismatic, fasciculated tubes. The 

 tubes are pentagonal and hexagonal ; regular or irregular ; 

 contiguous and rarely articulated. 



The favosites resemble the honey-comb in appearance. 

 Lamarck describes two species, both fossil. 



Sp. 1 . F. alveolata. Turbinated, irregular, transversely sulcated on 

 the outside ; the tubules rather large and subhexagonal ; the 

 inside of -the partitions striated. Esp. Supp. ii. Tab. iv. 



This fossil is particularized as being a turbinated mass, 

 as if truncated at the summit, its upper surface showing the 

 terminations of unequal pentagons and hexagons, appearing 

 like a net-work. The descriptions agree with the fossil from 

 Dudley, represented Organic Remains, vol. ii. PL vii, fig 3 

 and 7 ; and the fossil, Organic Remains, vol. ii. PL v. fig. 9, 

 is perhaps referrible to this genus. 



2. F. Gothlandica. With solid, parallel, contiguous, and hexahedral 

 prisms. Amoen. Acad. i. Tab. iv. fig. 27. 



This fossil is very interesting. It differs from the other 

 species in the prisms being parallel with each other, as is 

 observed by Lamarck, like the prisms of basalt. In the spe- 

 cimen which I possess, the angular tubes are so filled with 

 earthy matter as not to allow the discovery of the state of 

 the septa. 



Lamarck has thought it necessary to separate tubiporn 

 catenulata, chain coral, from the genus tnbipora, and to 

 place it in a distinct genus, cfi.teni.pora, and to form a genus, 

 tubipora, for the reception of T. mttsica only. But, by this 



