FROM THE RED CHALK. 
wo 
Or 
Sus-FAMILY—LOPHOSERIN i. 
Genus nov.—PopossEris, Duncan. 
The corallum has a large concave base, by which it is attached to foreign bodies. 
The epitheca commences at the basal margin, and is stout and reaches the calicular 
margin. 
The height of the corallum varies. 
The calice is generally smaller than the base, and is convex. 
The septa are numerous and unequal, the largest reaching a rudimentary columella. 
The central fossula is circular and small. 
The costee are seen when the epitheca is worn; they are distinct, connected by 
synapticulz, and are straight. 
The genus has been created to admit Micrabacie with adherent bases and more or 
less of a peduncle. 
1. Poposrris MamMmILirormis, Duncan. PI. IX, figs. 2—15. 
The corallum is short, straight, and broad. The base is concave, and is either larger 
than the calice or there is a constriction immediately above it, and it is slightly smaller 
than the calice. 
The calice is round, convex, depressed in the centre, and is bounded by the epitheca. 
The laminz are stout, unequal, curved superiorly, and often join. 
There are five cycles in six systems, the last cycle being very rudimentary. 
The synapticule are numerous. 
The costze are straight and subequal, and are smaller than the septa. 
The ornamentation of the septo-costal apparatus varies, and there may be an almost 
moniliform series of enlargements on the septa, or they may be plain. 
The columella is formed principally by the ends of the longest septa. 
The height of the corallum appears to be determined by the growth of the body 
between the base and the calice. 
Height of the corallum, } inch. Breadth at the calicular margin 3rd inch. 
1 1 
2? 2»? ”? ith ” 2? »” g 
pths 
» 99 oP) 2 3) 2? 29 9? 30 39 
Monstrosities are often found amongst specimens of this species. 
Locality. Hunstanton. In the Collection of the Rev. 'T’. Wiltshire, F.G.S. 
