522 LONSDALE ON EOCENE CORALS FROM N. AMERICA. 



9. PORITES. 



Only the casts of a few terminal stars of this coral were exa- 

 mined ; and they did not permit a comparison with published 

 tertiary species or the establishment of definite characters. The 

 casts showed that the stars were slightly concave, and in close 

 contact with a perfect structural blending at the lines of junction ; 

 and that the number of interrupted lamella^ in the best- defined 

 cases, did not exceed twelve. 



Locality. — Jacksonboro', Georgia. 



C. Polyparia Bryozoa. 



10. TUBULIPORA PROBOSCIDEA ? 



Tubes united in vertical fasciculi or branches, openings irregularly disposed, 

 more or less prominent, no marginal thickening ; outer layer investing the 

 fasciculi smooth or transversely rugose. 



An Pustulopora proboscidea ? Milne Edwards, Ann. Sc. Nat. 

 2nd series, Zool., tome 9. pi. 12. f. 2. ; also Recherches sur les 

 Polypes, Mem. sur les Crisies, &c. (Recent ; Mediterranean.) 



This fossil resembled, in its mode of 

 growth and general structure, the Mediter- 

 ranean coral referred by Dr. Milne Edwards 

 to Pustulopora, on account of the tubes 

 being grouped in vertical fasciculi. It has, 

 however, been deemed right to consider the 

 Rock's Bridge fossil a Tubulipora, partly 

 because M. Edwards has shown the close 

 connection between the recent polypidom 

 and that genus ; and partly because a coral 

 of common occurrence in deep water on the 

 south-western Cornish coast, and believed ^ , ,. , . , 



, , , .ill -\t r\ i • i • lubuhpora proboscidea. 



to be that described by Mr. Couch, in his , XT . , . , .. . . 



J ' (Natural size and magnified.) 



valuable " Essay on the Zoophytes ot Corn- 

 wall," under the name of Tubulipora deflexa, combines, occa- 

 sionally at least, an horizontal or attached with a vertically 

 fasciculated mode of growth, the tubular openings diverging from 

 all sides of the fasciculus. (Ninth Rep. Roy. Cornwall Poly- 

 technic Soc. p. 72., 1841.) 



Between the American fossil and Mediterranean coral, no dis- 

 tinction could be detected, so far as a comparison could be made, 

 sufficient to justify a decidedly specific separation ; nevertheless, 

 as the entire habits of growth of the two polypidoms could not be 

 ascertained, the specific determination of the fossil specimens must 

 be regarded as very doubtful. 



Locality. — Rock's Bridge. 



