laiube.] LLJSOZOIC CORALS. 53 



SVRINGOPORA I.VFLWDIBULA, Whitfield. 



Bpringopora infundibula, Whitfield. H77. Ann. L Surv., Wis., p. T.i. 



•/.*, Whitfield \HH2. GeoL of Wisconsin, p. 274, pi. XIV., fig. 7. 



'», White* ve». 1^4. PaJsoa iL III., pt. I., p. 2and 18^5, 



pt. J J., p. 19. 



CyttoHylus infundibulu ribed (op. cit.) as having "transverse 



diaphragms re 1 only by deeply funnel-formed, imperfect plates 



or cysts, appearing on the broken surface as a series of deep inverted 

 placed one within the other so closely as to produce by 

 their united tubes an almost or quite continuous columella along the 

 centre of the corallite re never continuous around 



the whole circumi closely arranged that from two to 



four may be counted in a length equal to the diameter of the tu; 



tabulae in the ooraUites of Syringopr/ra are generally stated to be 

 funnel-shaped. Nicholson, in the Palaeozoic Tabulate Corals, p. 208, 

 qualifies this by descril I as "well developed, usually more or 



uarly funnel-shaped, and often giving rise to a more or less continu- 



tube occupying the axis of the visceral chamber." On p. 211 of the 



same work excellent figures ar<- the corallites of 8. reticulata, 



type of the genu- in longitudinal and horizontal 



sections showing the inner structure. The tabulae are here shown to 



be imperfectly funnel-shaped, as a rule not continuous round the inner 



circumference of the corallites and to have their regularity broken at 



times by the introduction of cysts or blisters such as are found in Cysti- 



phyllum. Tne inner structure of the corallites, as shown in these figures, 



fair example of what is to be found in most of the Palaeozoic species 



of Syringopora in Canada. 



Judging from the figure appended to the description of Cystontylus 

 infundilwlus, Whitfield, there is nothing in the structure of this coral, in 

 the writer's opinion, to necessitate its removal from the genus Syringo- 

 pora as generally understood. It is possible that CystostyluH infundi- 

 rnay be found to be not distinct from S. verticillata, Goldfuss. 



The coral described by Prof. R. P. Whitfield occurs in the upper part 

 of the Niagara group of Wisconsin, in the vicinity of Wauwatosa and 

 Milwaukee. It is stated to have been found only in the solid limestone, 

 the inner structure being revealed on fractured surfaces but the exterior 

 surface of the corallites has not been 



In sp rom the Guelph formation at Durham, Out., 



the coral is preserved in a manner similar to that of the Wisconsin speci- 

 mens. The general disposition of the corallites with their connecting 

 tubes is well shown, as is also the inner structure. 



