TERTIARY CORALS. 57 



Ykmm—CABYOPHYLLIACE^. 



Tribe TllOCHOCYATHACEiE. 



Genus — Trochocyathus. 



1. Trochocyathus Austeni, Buncan. PI. IX, figs. 15 — 17. 



The corallum is rather tall, slightly curved and compressed ; it is rounded at the 

 base, and its sides are marked with slightly prominent but not spined or crested costse. 



The cahce is elliptical, much compressed, and slightly angular at its extremities ; its 

 long axis is on a lower plane than the short axis, and its margins are raised into 

 several angular processes, on account of the primary and secondary septa being less exsert 

 than the tertiary. 



The fossa is moderately deep ; and the columella is long, and not very visible. The 

 septa are thin, rather close, and very subspinose laterally. 



The septa are in six systems, and there are four perfect cycles. The septa are 

 unequal, and are not very exsert: the primary and secondary septa are on a lower 

 level than the others, and correspond to the largest and most prominent costse. 



There are small pah before the primary, secondary, and tertiary septa. 

 -The costae are distinct from the base, and granula • ; the primary and secondary are 

 the largest, and all are broader than the septa. Height of corallum, ^ths inch. Great 

 diameter of calice, ilths inch. Small diameter of cahce, ^ths inch. 



This species belongs to the striated TrocliocyatU ^ and its tall and curved form, with 

 its four cycles of septa, bring it in close relation with Trochocyathus elongatus, Edwards 

 and Haime.^ The angular calicular margin is wanting in this last species, whose coral- 

 lum is moreover slightly twisted. 



It is very evident that the new species is the representative of Trochocyathus elongatus. 

 Trochocyathus elongatus is found at Quartier-du-Vit, near CasteUane (Basses Alpes), in an 

 Eocene formation, and Trochocyathus Austeni was discovered at Bracklesham. 



In the collection of Frederick Edwards, Esq., E.G.S. 



2. Trochocyathus insignis, Duncan. PI. X, figs. 1 — 4. 



The corallum is tall, compressed, shghtly curved inferiorly, and it has a large calice and 

 a sharp base. 



The calice is ovoid, and its axes are on the same plane. 



' 'Hist. Nat. des Corall.,' vol. ii, p. 27. "~ ' Ann. des Sc. Nat.,' 3rd ser,, vol. ix, p. 305, 1848. 



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