Smyth — The Carhoniferou^ Coast-Section at Ilalahide. 13 



Zaphrentis delanouei occurs as high up as M 3. It is small, but a section 

 immediately below the floor of the calyx (diam. 6-5 mm.) has the typical 

 shape of fossttla. 



Block E, lower part (M 4f^ & M 5). l80 feet = U 



Abundant — 



Michelinia aff. megastoma, Phill. 

 Cyathaxonia cornu, Mich. 

 Zaphrentis densa, Carruthers. 



„ delanouei, Ed. & H., Carruthers. 

 Seminula, cf. amhigua, Sow. (in one bed). 

 Camarotoechia aff. Mitcheldeanensis, Vau. 



Less common — 



Ampkxus coralloides, Sow. 

 Syringopora 9, Vau. 

 Productus hurlingtonensis, Hall. 

 Fustula subpusttdosa, I. Thomas. ? 

 Schelwienella crenistria, Mut. Z, Vau. 

 Spirifer aff. dathratus, M'Coy, Vau. 

 Syringothyris lammosa, M'Coy. 

 „ sp. (cuspidate). 



Athyris glabristria, Phill. 

 Dielasma sp. 



At M 'id the fauna changes markedly. That below no longer contains 

 vesicular Caninia, and Zafh. delanouei becomes common. I have therefore 

 assigned these beds to Z. The presence here of a small form of Michelinia 

 iTiegaatoma would fit in with this correlation. 



Camarotoechia aff. Mitcheldeanensis forms a marked element in the fauna 

 from M ^d to the base of the Malahide exposure. 



Seminula, cf. amhigua, has only been found here, and appears to be con- 

 fined to one bed. If the correlation is correct, this is the lowest record of 

 this genus of which I am aware. 



No attempt has been made to correlate any of the Malahide beds with 

 horizon 7. The latter is defined as the band of overlap of two faunal 

 assemblages in the S. W. P. It ceases to have a meaning where the 

 assemblages and conditions differ considerably from those in the S. W. P. 



