304 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



the primary are the largest, and are connected with the largest 

 and most prominent costs© ; the secondary are smaller ; and the 

 smallest septa, i.e., those of the fourth and fifth orders, only unite 

 with the tertiary far inwards. The granules are large, and 

 appear to increase in size towards the columella. There are pali 

 before all the septa except those of the last cycle ; and the upper 

 edges of the septa pass upwards and inwards to reach the pali, 

 which are small, long and granular. The tertiary pali are more 

 external than the others ; and all are united laterally by a spongy 

 tissue, so as to form a ring higher than the septa in the body of 

 the calice. The ring occupies much space, forms the outside of 

 the columella ; and within the ring is a deep fossula, at the bottom 

 of which the hard and flat centre of the columella is seen, 

 Height of the corallum, -^ inch; breadth of the calice, -^ inch. 

 Locality, No. 7, 2\ miles east of the river Gellibrand. 



Trochocyathus victoria, Duncan. 



The following is Prof. Duncan's diagnosis of the fossil form. 

 Corallum subturbinate, compressed base elongate and nearly in 

 shape of a ridge ; calice elliptical, shallow ; costs© slightly waved, 

 distinct, subequal, prominent, rounded, ornamented on free 

 surface by circular disks with a central boss-like swelling or by 

 moniliform swellings, covered with a pellucid structure, which, 

 when worn, represents the outside of the disk ; slightly granular 

 laterally ; calicular margin broad, wall stout, septa smaller than 

 costse, rather exsert, soon becoming thin, granular laterally, 

 rather wavy, long, wide apart, unequal, higher orders long ; 

 turned towards the tertiary near the columella, four cycles, six 

 systems ; pali slightly broader than septal ends, long and 

 granular, before all septa except 4th and 5th orders ; columella 

 essential, spongy, small. Alt. -j%, calice long. \% lat. -^ of an 

 inch. Loc. Strata 2J miles east of river Gellibrand. A taller 

 variety with base filled up with sclerenchyma, longer costaa, and 

 more distinct ornamentation. Worn fossils present very distinct 

 costse and an uneven free surface, occuring in a dark shale in 

 numbers together. 



