1 64 FREDERICK IV. SARDESON 



branches arising from the celluliferous ridges of the monticule, 

 the reverse solid surface continuing from the central macula, 

 which has become solid or coarsely vesiculose, succeeding dis- 

 tinct mesopores, and forms the bottom of the funnel. The 

 median keel of the obverse side is, again, the continuation of 

 that of the ridge in the monticule stage, the same as appears in 

 the ridges of stars on Stellipora. The arrangement of the cells 

 on the branches originated likewise in that of the stars. The 

 basal expansion bears one largest frond, two to five smaller ones, 

 and several monticules of various degrees. The internal struc- 

 ture of the basal is more similar to Stellipora than to that of the 

 frond or reticulate part of Pliylloporina. 



The grown funnels must have crowded each other, and in fact 

 fossils evince irregular shape in their later stages. Some evi- 

 dently met accident, since specimens occur in which a new 

 growth arises from the broken edge of an older piece and in a 

 new direction. Also, a secondary basal lamina may develop 

 from the poriferous side of a fragment, bearing new somewhat 

 regular stars or monticules. A fragment may convert itself into 

 a single large monticule or new basal, and other variations 

 occur. 



The long cells with many tabulae in Phyllopori?ia are remark- 

 ably like those of Trepostomata. The basal expansion like a 

 Stellipora and the development of the reticulate funnels from 

 monticules suggests relationship with Trepostomata and not with 

 bifoliate Cryptostomata. There is not then any relation between 

 the Stictoporella cribrosa type of anastimosing branches and the 

 similarly anastimosing parts of Pliylloporina, which might better 

 be called bars than branches to distinguish them. 



Other truly reticulate forms probably derived from Pliyllopo- 

 rina as E. O. Ulrich suggests. 1 



Septopora biserialis (Swal.) has branches or bars 0.8 to 

 0.3 mm wide, dividing laterally, and united at intervals by trans- 

 verse processes called dissepiments, rather than anastimosing, 



1 Eastman, op. cit., p. 281. 



