Palceontology of Upper Silurian Rocks, Victoria. 87 



author says : "The new species [S. 7negal(>cystis\ is separated from 

 Pholidflphylluni and Polyorophe by tlie possession of dissepiuiental 

 tissue and from all known genera with dissepiments and tabulae 

 by the rudimentary condition of the septa." In connection with 

 Herr Weissermel's sections, it appears to me hard to reconcile 

 his figures 6 and la with the descriptions of the one species, as in 

 fig. la only dissepiraental tissue is shown, whereas in the letter- 

 press no mention is made of any part of the corallite being devoid 

 of septa. It appears to me that apart from the ditFerence of the 

 arrangement of the dissepiments, the relative proportion of the 

 central aseptate area and the condition of the tabulte, most of 

 which points seem to be of specific value only, there is very little 

 difference between the INIansfield coral and StorihygophyUiim 

 megalocystis, Weiss. If the difference between the Victorian 

 form and some of the described species of astrajoid Cyathflphyllum 

 be considered to be mainly one of degree, the same would hold 

 good for Storthygophylluin. 



I have referred to all descriptions of astrjeoid Cyathophylla at 

 my disposal and can find none tliat apji roaches closely to this 

 form. C. bolouensis, Edw. and Haime,^ shows that the septa do 

 not extend quite to the centre, tliough they are much more 

 numerous and the dissepimental area is greater than in our form. 



For the meantime I venture to class this form under the 

 heading Cyathophylliiin, adding to it the specific name of 

 elegantulum. 



Cyathophyllum mansfieldense, sp. nov. 



(PL III., Figs. 3, 4). 



Several examples of a simple turbinate Cyathophyllum occur 

 embedded in limestone from Manstield. 



Septa fifty-two, reaching to the centre and intermingling, 

 alternately long and short, but the ditterence in length lietween 

 the two orders is not always very strongly marked, extending to 

 well within the tabulate area. The fossula can only be faintly 

 distinguished. 



In the vertical section the dissepimental area is well marked 

 and easily distinguished fi-om the tabulate. The dissepiments 



1 British Pal. Corals, t. 52, f. la. 



