FROM THE UPPER AND LOWER WHITE CHALK. 11 



The sub-genus Ccelosmilia is represented in the British Chalk by one species 

 formerly known, by three varieties of it, and by five new species. 



1. Trochosmilia {C<£losinilia) laxa, Ed.&H. 



„ „ „ Varieties 1, 2, 3, Duncan. 



2. „ „ „ cornucopits, Duncan. 



3. „ „ „ Wiltsldri, „ 



4. „ „ „ Woodwardi, „ 



5. „ „ „ gramdata, „ 



6. „ „ „ cylindrica, „ 



These Trocliosmiliae, with a slight amount of endotheca — what there is of it is generally 

 low down — are very characteristic of the Upper Chalk, and their presence suggests that 

 the Upper Chalk of Norwich and Trimmingham is, from the evidence of its Corals, as 

 well as from the proofs already asserted from its Mollusca, on a higher horizon than the 

 Upper Chalk, usually so called, in the south-east district. The Coral evidence brings the 

 Norfolk Chalk closer in relation with the Faxoe, Rugen, and Ciply deposits. 



The affinity between Trochosmilia (C.) cornucopice and Ccelosmilia excavata, Hagenow, 

 sp. (a doubtful form, but well drawn by Quenstedt), is evident. It is from Rugen. 

 Trochosmilia Wilfshiri and T. Faujasi from Ciply are closely allied. 



The depth of the space between the calicular margin and the top of the upper dis- 

 sepiment in these species indicates that the corals had great mesenteric, ovarian, 

 perigastric, and water systems. They were probably very rapid growers. The wall is 

 merged into the costal system, which is strengthened by a most unusual cross-bar and 

 cristiform ornamentation ; and this development, which is almost epithecal, is comple- 

 mentary to the defective endotheca. 



Family— ASTR^IDiE. 



Division — TROCEOSMILlACEiB. 



Genus — Parasmilia. 



MM. Milne-Edwards and Jules Haime described five species of this genus from the 

 Upper Chalk, viz. — 



1. Parasmilia centralis, Mantell, sp. 



2. „ Mantelli, Ed. and H. 



3. „ cylindrica,, „ 



4. „ Fittoni, „ 



5. „ serpentina, „ 



