510 



LONSDALE ON EOCENE CORALS FROM N. AMERICA. 



12. Idmonea maxillaris Lonsdale, (sp. n.) 



13. Idmonea commiscens Lonsdale, (sp. n.) 



14. Idmonea. 



15. Lichenopora. 



16. Farcimia. 



17. Vincularia. 



18. Hippothoa tuberculum Lonsdale, (sp. n.) 



19. Eschara tubulata Lonsdale, (sp. n.) 



20. Eschara petiolus Lonsdale, (sp. n.) 



21. Eschara incumbens Lonsdale, (sp. n.) 



22. Eschara linea Lonsdale, (sp. n.) 



23. Eschara viminea Lonsdale, (sp. n.) 



24. Lunulites sexangula Lonsdale, (sp. n.) 



25. Lunulites distans Lonsdale, (sp. n.) 



26. Lunulites contigua Lonsdale, (sp. n.) 



A. Polyparia Amorphozoa. 



1. Ocellaria ramosa Lonsdale, (sp. n.) 



Branched or lobed ; fibres coarse, cylindrical or compressed, intimately reti- 

 culated ; interfibral lacuna? equal in dimensions to the fibres ; canals numerous, 

 vertical in centre of specimen, horizontal towards the exterior, no definite ar- 

 rangement, form more or less circular, no distinct wall, lower extremity blended 

 with the fibrous structure, interior sometimes penetrated by converging simple 

 fibres; exterior of specimen partially invested by a thin rugose layer. 



The resemblance be- 

 tween the Pyrenean and 

 Artois fossils, on which 

 M. Ramond established his 

 genus Ocellaria *, and 

 those bodies which Dr. 

 Mantell designated in the 

 first instance Alcyonium 

 chonoides "j", and subse- 

 quently Ventriculites ^,was, 

 it is believed, originally 

 pointed out by Mr. Cony- 

 beare § ; and Dr. Mantell 

 has identified the V. alcy- 

 onides || with M. Ramond's 

 Ocellarice. To what ex- 

 tent this generic agree- 

 ment may be accepted, the 

 descriptions in the work 

 on Mont-Perdu do not af- 



The right of the figure represents a concave 

 cast of the exterior of Ocellaria ramosa of the 

 natural size, with portions near the bottom of 

 the surface crust minutely punctured ; the 

 centre of the figure is a conical branch com- 

 posed entirely of canals with intermediate reti- 

 culations ; and the left is a series of transverse 

 sections of canals, exhibiting a smooth surface 

 irregularly intersected by fissures, which in- 

 dicate the extension, originally, of fibres. 



* Voy. au Mont-Perdu, p. 345. pi. 2. f. 1, 2. 1801, but previously described 

 in No. 47. of Bull. Soc. Philom. 



f Linn. Trans, vol. xi. p. 401. et seq. 1814 — 1815. 



j Geol. of Sussex, p. 176. et seq. 1822. 



§ Outlines Geol. Engl. p. 76. 1822. 



|| Trans. Geol. Soc. London, 2d series, vol. iii. p. 205. 1828 — 1829. 



