584 K. ETH .BRIDGE ON THE PALAEONTOLOGY OE THE 



place at the origin of the transverse or connecting tuhes, which cer- 

 tainly are more remote than in S. reticulata, His. It is not the 

 so-called B. multicaulis of Hall, from the Niagara group, which is 

 described as having from fourteen to sixteen rays. Neither is it 

 Billings's B. Maelurei or var. elegans (to both of which there is re- 

 semblance) from the Corniferous Limestone of Ohio. 



Syringoporce much resemble each other in all the older Paleozoic 

 rocks. Our species I believe to be new, and therefore venture to 

 figure it. 



Loc. Dobbin Bay, lat. 79° 40'. 



Group Rug os a. 

 Genus Cyathophyllum. 



Cyathophyllum articulatum (Wahlenb.). 



Madreporites articulatus, Wahlenberg, Nov. Act. Soc. Upsal. vol. 

 viii. p. 97. 



Cyathophyllum articulatum, M.-Edw. & Haime, Mon. Brit. Sil. 

 Corals, Pal. Soc. p. 282, t. 67. f. 1. 



Three specimens of this branching cyathophylloid coral come from 

 the Upper Silurian rocks of Dobbin Bay. They agree in every par- 

 ticular with Wahlenberg' s species C. articulatum. In C. cces-pitosum 

 of Lonsdale the corallum is fasciculate and the corallites closely 

 arranged. The accretion-ridges are not quite so highly developed 

 as in the British species ; this, however, depends much upon the 

 state of preservation of the corallites. Compared with our Wenlock 

 forms no difference can be detected. 



This coral was collected by Mr. Hart at Cape Hilgard, lat. 79° 41', 

 and by Dr. Coppinger in Dobbin Bay, lat. 79° 40', in the Upper 

 Silurian series. 



Genus Chonophyllum, M.-Edw. & Haime, 1850. 



Chonophyllum, sp. allied to magnificum, Billings, Canadian Journal, 

 1859 ; E. Bominger, Geol. Surv. Lower Peninsula, Michigan, 

 1876, p. 116, t. 43. (PL XXYIIL fig. 3.) 



Three portions of the calice of what must have been a very large 

 coral, from 3 to 4 inches in diameter, occur in the collection. 



On comparison with the figure of this species by E. Rominger 

 (Geol. Lower Peninsula, Michigan, 1876, p. 116, t. 43), I have no 

 doubt that these calicular pieces should be referred to Chono- 

 phyllum magnificum. The very coarse and equal septa and small 

 but deep somatic cavity agree in every particular with this Upper 

 Helderberg species. 



Sp. char. Corallum conical; calice greatly expanded or explanate, 

 flattened towards the edge; septa equal, linear, about ninety in 

 number, thick or broad near the circumference of the corallite. 

 Our specimens do not show the centre or somatic cavity of the 



