Most specimens are well preserved up to the top of the 

 corallite wall, which is stout, but the fragile exsert septa are 

 usually broken off to this level. A transverse section of the 

 calice is thus presented, in which the six secondary septa bisect 

 as many triangular areas formed by the tertiaries and their 

 accompanying pali, with the straight primaries dividing the 

 intervening spaces. The slender free quaternaries are rarely 

 preserved except close to the wall. Usually the pali may still be 

 recognised as raised processes uniting with the columella. 



From the fractured example of a corallum figured it will be 

 seen that the pali are connected in the calicle by a regular series 

 of stout transverse bars. No such junction occurs between 

 neighbouring septa, the interseptal loculi remaining open 

 throughout. 



The costae are continuations of the septa, granular, in four 

 cycles, and separated by distinct grooves. The primary and 

 secondary are subequal, and the rest then slightly diminish in 

 size according to order. The first two orders are free to the 

 base ; the tertiaries and quaternaries unite from a fourth to a 

 £fth above this, and then continue to it as a single costa. 



The dimensions of the type, of which the calice is figured, are 

 — Height of corallum, 7 '5 mm.; diameters of calice, 5-5 mm. and 

 5 mm. It is a medium sized individual, with an almost perfect 

 calice. Larger specimens are as much as 10 mm. high, with 

 correspondingly larger calices. 



Locality, <&c. — Very abundant in the Eocene of Spring Creek, 

 13 miles south of Geelong. Though closely allied to Z>. viola, it 

 cannot be mistaken for that species ; not only is it rounder in 

 form, but the costte are broader, and the grooves between these 

 are narrower. 



Parasmilia Hepmani, spec. nov. Pi. i., figs. 4a, 6, c, d. 



The corallum has a very small pedicellate base. It varies in 

 form, and may be horn-shaped, subturbinate, or even tall and 

 subcylindrical. The calice is deep and usually circular, but 

 sometimas elliptical. The septa are thin and slightly exsert near 

 the margin, when they slope rapidly down to the central fossa ; 

 rows of delicate granules on their sides follow the curve of their 

 upper margins. They are in six systems, with four cycles. The 

 primaries and secondaries are equal, the tertiaries nearly as long, 

 and the quaternaries much shorter ; all are free throughout. 



The endotheca is generally scarce, but in the type calice some 

 septa are united by dissepiments for a short distance from the 

 wall. There is a strong epitheca with circular growth ridges at 

 irregular intervals on the surface of the corallum, and the costae, 

 which are continuations of the septa, can be traced beneath it as 

 slender interrupted lines almost to the base. 



