28 



BRITISH FOSSIL CORALS 



The calicinal fossa is very narrow, long, and shallow. 



The septa are close, alternately thick and thin. They number (in full-sized calices) 176. 

 The columella is lamelliform and indistinct. 



Locality. Haldon. In the Collection of William Vicary, Esq., F.G.S., Exeter. 



The specimen figured in PI. X is a young corallum, and has only five cycles of septa. 

 Its granular costse and the peculiar striation of its septa are very characteristic. 



The height of the specimen is \ inch, and the length of the calice is rather more. The 

 breadth is i^ths inch. 



The Placosmilia hitherto described are from the Craie tufieau and the Hippurite 

 Chalk of Soulage and Bains de Rennes (Corbieres), Les Martigues, Uchaux, Obourg near 

 Mons, and Gosau. 



2. Placosmilia Parkinsoni, Ed. and H. PI. X, figs. 6 and 7. 



Placosmilia consobe,ina, Reuss. 



The corallum is tall, compressed, conical, and slightly curved. 

 The costse are fine and separated by decided intercostal spaces. 

 The calice is subelliptical in shape. 

 The fossa is narrow and shallow. 

 The columella is feebly developed. 



There are five cycles of septa, and the laminae are very unequal. 

 Locality. Haldon. In the Collection of Wilham Vicary, Esq., F.G.S., Exeter. 

 The specimen from Haldon is somewhat rolled and worn. The height is ^^o'tlis inch. 

 The breadth of the calice is ^^ths inch, and its length is ^^ths inch. 



Placosmilia Parkinsoni has been found at Gosau, in the Corbieres, and at Uchaux. 



3. Placosmilia magnifica, Duncan. PI. X, figs. 11 — 13. 



The corallum is compressed, short, very elongate, and the calicular margin is curved 

 and rounded. 



The calice is very long, curved, rounded at each end, compressed, very open, and 

 shallow. 



The septa are unequal, distant, large, and curved ; they correspond to costae of the 

 same size. There are five cycles of septa. 



The columella is lamellar, very much developed, thick, continuous, long, and slightly 

 prominent in the calicular fossa. 



The costa) are unequal and distant. 



