116 
rings of growtli. The septa numher forty, those on the side of tlie large 
curve being shorter than the others. They are more or less recurved upon 
themselves, and unite near the centre into two lateral groups, producing 
a fossula which reaches beyond the centre of the calice, and occupies a lateral 
position. In the marginal part of this fossula are three accessory septa, the 
middle one being smaller and less distinct than the other two. 
Dimensions. — The total length is from four to five centimetres ; the 
larger diameter of the calice is thirteen millimetres, and the smaller eleven 
millimetres. 
Distinguishing Characteristics. — This species hears some resemblance 
to the preceding, l^ut differs from it by the number of its partitions and the 
length of its fossula. 
Dormation and Localities. — Mr. J. Thomson found this species in 
Scotland, associated with the preceding. In New South Wales it was found 
at Burragood, on the Paterson. 
Zaphrentis robusta, L. G. de Koninch} 
PI. V, Pig. 9. 
Corallum turbinate, dumpy, slightly curved, with a circular and deep 
calice. Epitheca thick and marked with numerous irregular lines of growth, 
and obtuse, longitudinal, equal costae. There are thirty-six slightly-flexuous 
septa, not reaching quite to the centre of the calice, the bottom of which can 
be seen. A very narrow fossula is situated on the side of the small curve, 
and does not quite reach the centre. Besides the principal septum, there are 
in it two faintly-indicated secondary septa. 
Dimensions. — The only fragment of this sjieeies I have seen is three 
centimetres long ; the diameter of the calice is twenty-one millimetres ; and 
the thickness of its epitheca, two millimetres. 
Distinguishing Characteristics. — This species differs from the preceding 
by its turbinate form, the greater proportional diameter of its calice, and 
above all by the thickness of its epitheca. 
^ \^Zaphrentis (Plerophyllum ?) robvUa, R. Etheridge, julir., Meiii. Geol. Survey N. S. Wales, Pal. V, Ft. 1, 
1891, p. 14._W.S.D.] 
