115 
'Formation and Localities. — The only specimen found came from a 
brown Carboniferous limestone at Colocolo ; but I am not satisfied as to its 
exact determination. Mr. J. Thomson found it in the shales at the base of 
the Carboniferous Limestone of Scotland. 
2. Zaphrentis gregor-Yana, L. G. de Koninck} 
PI. V, Pig. 7. 
Corallum of moderate size, shaped like a horn slightly lient, with 
faintly-marked lines of growth. The epitheca is thin, and allows some 
strongly-marked longitudinal costae to make their appearance, usually simple 
on the convex side of the curve, but a good number of them bifurcating by 
interposition on the concave side. The calice is circular and moderately deep. 
There are thirty-six septa, all much thicker towards the outside than the 
inside, all converging to and slightly curving themselves towards the centre ; 
most of them are joined by irregular dissepiments, especially those parts 
nearest the circumference of the coral. The fossula is large, does not quite 
reach the centre, is divided by a small medial septum, and is placed on the 
side of the smaller curve. 
Limensions. — The length is five centimetres, and the diameter of the 
calice two centimetres. 
Distinguishing Characteristics. — This species resembles Z. Ctiffordana, 
Milne Edwards and J. Haime, in the position and shape of its fossula ; it 
differs from it by its greater size and by the arrangement of its costm. 
Formation and Localities. — Mr. J. Thomson found this species in the 
shales underlying the Carboniferous Limestone of Scotland. In New South 
Wales it has been found at Jervis Bay and at Colocolo in a blackisli-grey 
calcareous sandstone. 
Zaphuentis cainodon, L. G. de Koninck? 
PI. Y, Pig. 8. 
Corallum conical, slightly curved, long in proportion to its diameter. 
The calice is slightly oval and deej), with thin edges. The epitheca has 
disappeared, but was probably thin and smooth, as there are no traces of 
' [_ZaphrenHs (Plerophyllum ?J Gregoriana, E. Etheridge, junr., Mem. Geol. Survey N. S. Wales, Pal. V, 
Pt. 1, p. 11.— W.S.D.] 
\_ZaphrenUs {Plerophyllum 1) cainodon, E. Etheridge, junr., Mem, Geol. Survey N. S. Wales, Pal. V, Pt. 
1, 1891, p. 10.— W.S.D.l 
R 
