FROM THE UPPER AND LOWER WHITE CHALK. 3 
MM. Milne-Edwards and Jules Haime, having all this information before them, very 
properly admit the generic and specific names to be Caryophyllia cylindracea, Reuss, sp. 
(‘ Hist. Nat. des Corall.,’ vol. ii, p. 18). 
This species is very polymorphic, and the pali of some specimens are very like the 
outer terminations of the columellary structures in some Parasmilie. Very frequently it 
is hardly possible to determine in Caryophyllia cylindracea which are pali and which the 
ends of the columellary fasciculi. Moreover, in some specimens the base is small and the 
costee reach low down, whilst in others the base is normal and large, the coste being 
abnormal from their length. 
There is a new species of this genus in the Dunstable Chalk and another in the Chalk 
of Sussex. There are thus three species of Caryophyllia in the Upper Chalk of England : 
1. Caryophyllia cylindracea, Reuss, sp. 
2. zs Lonsdalei, Duncan. 
3. = Tennanti sa 
1. CARYOPHYLLIA CYLINDRACEA, Feuss, sp. PI. I, figs. 7—12. 
In the British Museum, Dixon Collection. 
2. Caryopuyiiia Lonspaet, Duncan. PI. I, figs. 1—3. 
The corallum has a large and encrusting base, and the stem is cylindro-conical and 
straight. There is a slight curve near the base. 
The calice is circular, small, not very open, and moderately deep. 
The columella is small, and is terminated by rod-shaped processes. 
The septa are slightly exsert, the primary especially. There are three complete 
cycles, and the septa of the higher orders of the fourth cycle are not developed in every 
system. The primary, secondary, and tertiary septa are very alike. They have a wavy 
inner edge, and are granular. 
The pali are situated before the tertiary septa, and are knob-shaped and rather flat 
from side to side. 
The costz are nearly equal at the calicular margin, and pass downwards as flat, band- 
like prominences, separated by shallow intercostal grooves. ‘They are continued to the 
base, but are hidden midway by an epithecal growth. 
Height of the corallum, :ths inch. Breadth of the calice, rd inch. 
‘Locality. Dunstable. In the Collection of the Rev. T. Wiltshire, F.G.S. 
This species is readily distinguished by its coste, and is more closely allied to 
C. cylindracea than to any other form. 
