PROF. P. M. DUNCAN ON STREPTELASMA R@MEBRI. 19/8) 
Fig. 8. Intercostal spaces continuous with the median lines of septa (magni- 
fied). Rarely observed. 
ta Calices (slightly magnified). 
11. Transverse section low down in a coral (magnified). 
. Transverse section high up in the same coral (magnified). 
13. Transverse section in another coral, low down, showing junction of 
septal ends (magnified). 
14. Section showing large septum ending in the midst of a tabula (mag- 
nified). 
15. Section ne septa crossing the axial space (magnified). 
16. A longitudinal section showing faint tabule (slightly magnified). 
17. Septa ending in the columella; longitudinal section (magnified). 
18. Section of the base: the lines denote the position of the vertical pair of 
costee. 
Discussion. 
Tur Cuarrman (Dr. J. Gwyn Jurrreys) referred to the difference 
of generic names used by paleontologists and zoologists. 
Prof. SrELtEY agreed with the President in thinking that all 
paleontological work should be based on zoology. 
Dr. HinpE remarked on the curious fact that the same coral, as 
interpreted by Dr. Duncan, showed different septal arrangements, 
such as might belong to different genera, at different heights in the 
ealice. He asked on what grounds the form was placed in the 
genus Streptelasma. 
The AvtHor, in reply to the Chairman, said that the true Paleo- 
zoic corals are really of very different types from the Mesozoic and 
recent ones. He stated that Streptelasma occurs in. the Lower 
Silurian in America, but in the Upper Silurian in England. He 
stated also that some species of Streptelasma present the characters 
assigned to the genus by Hall, namely, the convolution of the septa 
around the axis of the calice. 
