PROM THE UPPER AND LOWER WHITE CHALK. 9 



The calice is elliptical, and the fossa very deep, the larger septa joining those opposite 

 at its bottom. 



There are traces of epitheca. 



Height, 1 inch. Breadth of calice fths inch ; length of calice, 1 inch. Depth of 

 fossa fths inch. 



Locality. Trimmingham ; Upper Chalk. In the Collection of the Rev. T. Wilt- 

 shire, F.G.S. 



3. Trochosmilia (Ccelosmilia) Wiltshiri, Duncan. PI. Ill, figs. 1 — 5. 



The corallum is tall, curved, finely pedicillate, and is not compressed. 



The growth-rings are distinct. 



The costse are very distinct and unequal, and they reach from base to calice. The 

 smaller intermediate costse are ornamented with chevrons and horizontal lines. The 

 larger costae have a secondary crest upon their free surface. 



The septa are unequal, slender, and not crowded. 



The calice is circular. 



There are five cycles of septa, but the fifth is incomplete in some systems. The 

 primary septa are large, slightly exsert, and extend far inwards. 



The calicular margin is very thin, and the fossa is deep. 



Height, l|rds inch. Diameter of the calice, |rds inch. 



Locality. Norwich ; Upper Chalk. In the Collection of the Rev. T. Wiltshire, 

 F.G.S. 



4. Trochosmilia (Ccelosmilia) Woodwardi, Duncan. PI. IV, figs. 5 — 8. 



The corallum is tall, cornute, slightly pedicillate, and narrow. 



The growth-markings are distinct. 



The costee are distinct from base to calice. Two large subcristiform and very 

 distinct costge bound three intermediate small and more or less moniliform costse. Sets 

 of these costse occur around the corallum. 



The septa are crowded, wavy, and unequal. Many unite laterally, and the largest 

 reach far into the axial space. 



The calice is circular, and the wall is very thin. 



Height, 2 inches. Breadth of the calice, §ths inch. 



Locality. Chalk of South of England. In the British Museum (Dixon Collection). 



2 



