18 



Scientific Proceedings, Royal Dublin Society. 



The Malahide beds resemble the Solmiofora sub-zone (-y - Ci) of the ]^.W. 

 Prov. in the abundance of Athyris glahristria and the occurrence of Vaughania 

 deistopm'oides. Several other species, too, are connnon to both (see Garwood, 

 Q.J.G.S., vol. Ixviii, 1912, p. 460). 



III. Palaeontological Notes. 



Michelinia gracilis, sp. nov. (PI. I, fig. 5, and text fig. 1) 



M13 = G:. 



Description. — Corallum of two to four long, flexuous, tubular corallites. 

 Greatest length observed 5 cm., but the specimen was incomplete. Diameter 

 of largest corallites 5 mm. Epitheca minutely wrinkled transversely. Group- 

 ing of tubes often, but not always, m one plane, recalling Halysitcs. Tubes 

 usually in contact, but sometimes diverging near their extremities. Tabulae 

 numerous, convex upwards, mostly complete, but often running together. 

 No trace of septa. Mural pores few, irregularly distributed. When a corallite 

 first appears it is D-shaped, or, if added between two others, triangular. 

 In either case, the common wall is slightly convex towards the older 

 corallite. 



Fig. 1. — Michelinia gracilis, sp. nov. 1-7, serial section of one specimen; 8, longitudinal 

 section of another specimen, showing divarication. Natural size. 



Comparison. — I had assigned this coral provisionally to Beaumontia until 

 mural pores were proved. The tabulae are exactly as in B. egcrtoni, 

 M.-Ed. & H,, and in the divergence of the corallites it recalls B. laxa 

 M'Coy. 



