7fJ 



5. T. ramulosa. — Formed of tubes connected by sub-dichotomous 



ramifications. — Org. Rem. vol. ii. p. 18, PI. iii. fig. 1. 

 Fossil. 



6. — fascicularis. — O. Fabr. Fn. Groenl. 429. 



Fossil. 



7. — ramosa. — Koelruter Act. Petrop. p. 374, Tab. x. fig. 3. 



Recent. 



8. — pinnata. — Pallas el. Zooph. p. 247, n. 151. 



Recent. 



9. — penicillata. — O. Fabr. Fn. Groenl. p. 429, n. 430. 



Recent. 



10. — flabellaris.— Ibid. p. 430, n. 431. 

 Recent. 



11. — stellata. — Modeer. n. Act. Stockh. 1788, n. 10, Tab.vii. fig. 1. 

 Fossil. 



12. — strues. — Ibid. 4. n. 1. 



Fossil. Org. Rem. vol. ii. p. 16, PL ii. fig. 1. 



An interesting fossil is found among the diluvial sub- 

 stances of the Farringdon gravel, which has not hitherto 

 been described, and which appears to belong to this genus. 



It is formed of tubes about the size of a crow's quill, in- 

 osculating frequently at its base ; the cavities of the tubes 

 are divided by very closely-set transverse plates, pierced 

 with a small, well-defined central foramen. Further oppor- 

 tunities of examining the fragments of this fossil are ne- 

 cessary to allow of determining whether there exists any 

 other communication between the tubes besides that re- 

 sulting from their early inosculations. Until then its specific 

 characters can hardly be considered as ascertained ; but, 

 should nothing contradictory be discovered, it may be dis- 

 tinguished as T. anastomosans. 



This fossil is seldom found in a state which will lead to a 

 suspicion of its nature. The broken tubes, for they are ge- 

 nerally in fragments, have mostly a whitish and shelly ap- 

 pearance ; but, on their surface being examined with the aid 

 of a lens, it is found somewhat to resemble that of shagreen 

 skin, and to give the notion of its having been covered by 



