PROM THE UPPER AND LOWER WHITE CHALK. 15 



Some primary septa nearly reach those opposite to them, and form a rudimentary 

 columella. They are dentate, crowded, and are granular laterally. 



Diameter of usual-sized calices, jth inch. 



Locality. Gravesend Chalk. In the British Museum (Dixon Collection). 



The condition in which the specimens of this species are found is very remarkable. 

 The inside of nearly every cahce has been worn away, so that the mural edges of the 

 septa are all that remain. The perfect calices appear to have shrunk from the surrounding 

 ccenenchyma, and in many places the costse have been worn off. 



A large Calice magnified. 



There are several specimens of Corals from the Lower Chalk, which cannot, however, 

 be identified, on account of their fragmentary condition. Most probably, Onchotrochus 

 serpentinus, Duncan, is a Lower as well as an Upper Chalk form. 



The following is a complete list of the Possil Corals from the Upper and Lower White 

 Chalk of Great Britain ; 



III. — List of New Species. 



1. Caryophyllia Lonsdalei, Duncan. 



2. „ Tennanti, „ 



3. Onchotrochus serpentinus, „ 



4. Trochosmilia {Ccelosmilia) cornucopits, Duncan. 



5. „ J, Wiltshiri, „ 



6. „ „ Woodwardi, „ 



7. „ ,, granulata, ,, 



8. „ „ cylindracea, „ 



9. Parasmilia monilis, Duncan. 



10. „ granulata, „ 



1 1 . Diblasus Gravensis, Lonsdale. 



