130 



U. LINUSTKOM, IIELIOLITIU^E. 



Propora tubulata Lonsd. p. 89. 



Fig. 28. Showiiig calicinal gemniation, a young colony 

 on au old polyparj'. ''/i. Eksta, Gothmd. 

 5 29 — 31. Sectious of speciraen called Lyellia 

 parvituba. Rominger from Louisville, 

 Kentucky, Niagara gvoup. It is a variety 

 of Pr. tubulata, corapare figs. 9 & 10 or 

 14 & 15. In fig. 29 the calicles are com- 

 pletely filled with adventitious crystals of 



låter growth, of which so great masses 

 are seeu in the calicular tubes and also 

 around on tlie convcx laminse of the coenen- 

 chyraa. Vi- In the scction, fig. 31, the 

 frequeut breaks in the continuity of the 

 calicular tubes are also to be observed, 

 caused by the exuberant growth of the 

 coenenchyma. 



Propora conferta Edw. & H. p. 93. 



Fis. 32. 



33. 



34. 



35. 



Transverse section of the original specimen, ' 

 preserved in the Collection Verneuil in the 

 »Musée de TÉcole des Miues> in Paris. Fig. 36. 

 From Borkholra in Estland, stratum F^. 



■Vi. 



Calicles a little more enlarged, same spe- 

 cimen, to show the curious aspect of the 

 septa, crystals having growu in tufts on 

 their extreraities. 



Longitudinal section of the same specimen. 37. 



Vi. 

 Part of a calicle of specimen frura Borkholm 



in Estland, highly niagnified, ^'/i; to show \ - 38, 3 



the deformation of the septal ends, being 

 covered by cristals of arragonite. 



Surface of specimen, nat. size, from Walve 

 ref, Gotland found detached, and of the 

 same structure as the specimen of Milne 

 Edward's. The acula^ on the tabuke in 

 this and other specimens are not indispu- 

 tably organic, but rather cristals of mine- 

 rals. 



Surface of the second of Milne Edwakd's 

 original specimens, in École des Mines, 

 from »Chavli» in Estland, nat. size. 

 Sections of the same. Vi- 



