FROM THE UPPER AND LOWER WHITE CHALK. 13 



granular costse between them, and in the intercostal space there is a series of moniliform 

 granules. 



The calice is often smaller than the body, and the wall is very thin. 



The septa are small, and there are four cycles, the last cycle being rudimentary. 



The columella is small. 



The height varies from I inch to 2 inches, and the diameter from 5 to |rds inch. 



Locality. Gravesend. In the Collection of the Rev. T. Wiltshire, F.G.S. 



3. Parasmilia granxjlata, Duncan. PL VI, figs. 5 — 8. 



The corallura is tall, nearly straight, finely pedunculate, and cylindro-conical. 



The calice is very large, widely open, deep, and has a thin margin. 



The columella is well developed. 



The septa are barely exsert, reach but slightly inwards, and pass downwards at once. 

 They are very unequal, and alternately large and small, and there are four complete cycles 

 and part of the fifth. 



The costse are subequal near the calice, and the broadest are continuous with the 

 smallest septa. On the body the costse are subcristiform and in sets of four. On the 

 pedicel they are very granular and very distinct. 



Height, l|rd inch. Breadth of caHce, \ inch. In the British Museum (Dixon 

 Collection). 



This species was included by Lonsdale in his genus Monocarya, and was termed 

 M. centralis. Parastnilia has the priority as a genus, and the species is evidently not 

 P. centralis. 



The position of the genus Parasmilia is somewhat like that of Ccehsmilia, but MM. 

 Milne-Edwards and Jules Haime have created the genus Cylicosmilia for Parasmilice with 

 abundant endotheca. Now, in careful sections (pi. VI, figs. 12, 13) I find that 

 P. centralis and its varieties have endothecal dissepiments reaching close to the calicular 

 fossa. The genus must, therefore, absorb Cylicosmilia ; and C. Altavillensis, Defrance, sp., 

 of the Eocene of HautevUle, must become Parasmilia Altavillensis, Defrance, sp. 



Reuss has described an Eocene Parasmilia from Monte Grumi which is closely allied 

 to the Parasmilia centralis series. 



