FROM THE LOWER GREENSAND. 43 



There is no epitheca, and the costse are distinct. 



There is no cohimella, and the septa unite hterally, and are very numerous. 



TuRBiNOSERis De-Fromenteli, Duncan. PI. XV, figs. 13 — 18. 



The corallum is tall, and more or less cylindro-turbinate. 



The calice is shallow, and circular in outline. 



The septa are very numerous, long, thin, straight, and many unite laterally with longer 

 ones. There are 120 septa, and the cyclical arrangement is confused. 



The synapticulas are well developed. 



There is no columella, and the longest septa reach across the axial space. 



The costse are well developed, and often are not continuous with the septal ends. 



Height, I^ths inch. Breadth of cahce, l^^ths inch. 



Variety. — With a constricted wall and large base. 



Locality. Atherfield, in the Lower Greensand. In the Collection of the Royal School 

 of Mines. 



The necessity for forming a new genus for this species is obvious. , It is the neighbour 

 of Trochoseris in the sub-family of the Lo'plioserincs. This last genus has a columella, 

 and the new one has none. 



The species has not been hitherto described, but it has been familiarly known as a 

 Montlivaltia ; but the synapticulse between the septa and costse determine the form to 

 belong to the Fmpdes. 



V. — List oe New Species from the Lower Greensand. 



1. BracJiycyathus Orhignyanus, Ed. and H. 



2. Trochosmilia Meyeri, Duncan. 



3. Isastrma Morrisii, „ 



4. Turhinoseris De-Fromenteli, „ 



VI. — List of the Species from the Lower Greensand. 



1 . BracJiycyathus Orhiynyanus, Ed. and H. 



2. Smilotrochus Austeni, Ed. and H. 



3. Trochosmilia Meyeri, Duncan. 



4. Isasfrcea liorrisii, „ 



5. Turhinoseris De-Fromonteli, ,, 



6. Holocystis eleyans, Lonsdale, sp. 



7 



