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GENUS 1. LOPHOHELIA (M. Edw. & Haime). 
Madrepora (Linn.). 
Oculina (Lamarck). 
Litkodendron (Schweigqer). 
Corallum tree-like, or forming a branching thicket, 
the branches coalescing; the form results from a 
gemmation irregularly alternate and sub-terminal. 
There is no true coenenchyma, but the walls are very 
thick, scarcely ribbed. 
Calices having a deep cavity, with a reverted 
lamellar edge. 
Columella palules wanting. 
Plates entire, salient, unequal, the principal ones 
united towards the lower part of their inner edges, 
at the bottom of the visceral cavity. 
There is but one known British species, L. prolifera. 
