FROM THE CAMBRIAN LIMESTONE BRECCIA 83 



Cell-walls of clear granular calcite ; interior infilled with a dark grey granular material. 

 Where massed together the individual cell-walls can always be singled out by a dark 

 line separating each tube. 



Measurements. — Average height of thallus, single tufts, about 5 mm. Aggregated 

 tufts about 4 mm., or even more, in diameter. Average width of cells, - 05 mm. 



Observations. — The Sardinian species, E. flabellatum, shows the same general habit 

 of growth as the Antarctic form, but the organism is of stronger and larger growth, 

 the tubular cells are stouter, and the plan of dichotomy is different ; since E. fasci- 

 culatum is characterised by the forked terminals of the cells being more slender and 

 more regularly cylindrical than in E. flabellatum, whilst their extremities, seen in 

 section, present a tuning-fork shape by the forked tips tending to become parallel. 



The dimensions of E. flabellatum are in every way greater than in E. fasciculatum, 

 as the following table will show : 



Diameter of tubes . E. fasciculatum . . . - 05 mm. 



E. flabellatum . . . - 08 mm. 



Average length of tufts . . E. fasciculatum . . . 0'5 mm. 



E. flabellatum . . . - 7 mm. 



Occurrence. — In a pebble of Cambrian limestone breccia, containing Archseo- 

 cyathinoids, oolite grains, and ostracods. Obtained by Wild on the Southern 

 journey, 85° S. An important organism, constituting a large proportion of the lime- 

 stone. 



Notes on the more important occurrences in the slides. — No. 2. — A good, typically 

 thin section, showing some fine examples of Epiphytal, which exhibit the general 

 characters (Para type). No. 69. — Globular masses of the organisms, drifted into a 

 recess. No. 111. — Good rounded masses, not so digitate as usual. No. 114. — Small 

 flocculent masses of the organism. No. 115. — Finest example of E. fasciculatum, 

 showing good detail (Type). No. 119. — Capitate specimen. No. 122. — Pellet-like 

 masses, seen in a rather thick section. 



