-222 Frederick Chapman: 



ian, and hitherto confined to the North American area. 

 R. itmbcllifera, Billings sp. 25 is found in the Corniferous Lime- 

 stone (Lower Devonian) of Wainfleet, Lake Erie, Canada West; 

 whilst a Silurian species, R. niagarensis, Rominger sp. 26 occurs 

 in the Niagara Group, Upper Silurian, at Port Detour, Lake 

 Huron, and also at Iowa. 



Occurrence. — Abundant as well preserved ochreous-coated casts 

 in the olive-brown mudstone of Ruddock's Quarry, near Lilydale. 

 .Silurian ( Yeringian ) . 



Fam. SYRINGOPORIDAE. 

 Genus Syringopora, Goldfuss. 

 Syringopora tiiomii, sp. nov. 



Description. — Corallum moderately large; corallites in fairly 

 •close contiguity, about 2cm. or more in length, connected by short 

 ■epithecal stolons. Calices filled with both funnel-shaped tabulae 

 -and numerous dissepiments which are confined to the sides. Walls 

 of corallites thick, measured about .75 mm.; average diameter 

 of calices, 3 to 4.6mm. Septa minute, spines about 40 to the cyclt. 



Observations. — The calices in this species are exceptionally 

 large for the genus, but are more than matched by the Middle 

 Devonian vS\ spelacanus, Eth. fil. 27 found at Cave Flat, Murrum- 

 bidgee River, N. S. Wales, and at Buchan, Victoria. The latter 

 species differs however, in having much more widely separated 

 corallites, which measure 5.5 to 6mm. in diameter. The corallites 

 ■of vS\ spelaeanus measure about 5 or 6 inches in length, against 

 three quarters of an inch in S. thomii. 



The walls of the Victorian species are not so thick as in 

 S. porteri, Eth. fil. 28 of the Tarn worth Limestone (Mid. Devon- 

 ian), which also has smaller corallites (1.5 to 2mm. in diameter). 



Syringopora syrinx, Eth. fil. 29 from the Carboniferous Lime- 

 stone of Lion Creek, near Rockhampton has smaller calices than 



25. Aulopora umbellifera, Billings. Canadian Journ. (N.S.), vol. IV., 

 1859, p. 119. 



26. Quenstedtia nigarensis, Rominger, Geol. Surv. of Michigan, vol. III., 

 pt. II., 1876, p. 72, pi. XXXIII., fig. 3 (lower specimen). 



27. Rec. Austr. Mus., vol. IV., No. 7, 1902, p. 258, pi. XXXVII., fig. 2; 

 pi. XXXVIII. 



28. Rec. Geol. Surv., N.S. Wales, vol. VI., pt. 3, 1899, p. 176, pi. XVIII., 

 fig. 3; pi. XXXI., figs. 1, 2. 



29 Bull. Soc. Geol. Surv., Queensland, No. 12, 1900, p. 6, pi. I., figs. 

 •6-9; pi. -II., fig. 11. 



