REPORT ON THE REEF-CORALS. 39 
Family I. Turprnonips. 
Genera Desmophyllum, Flabellum, &e. 
Family II. CyarHaxoni2. 
Genera Cyathaxonia, Guynia, Duncania, Haplophyllia.! 
Family III. Dasmipaz. 
Genus Dasmia. 
Subsection IT. OCULINIDA. 
This subsection is characterised as follows :— 
Colonial Madreporaria Aporosa in which the interseptal loculi are usually open to the 
base, but sometimes with dissepiments or tabule. Internal space diminishing on account 
of the growth of stereoplasm. Solid interealicular ccenenchyma usually well developed. 
Family I. Ocuninip™. 
As II. Poctttoporms. 
These families are taken as defined by Professor Duncan,’ but it seems to me very 
doubtful whether they will prove to be really distinct. 
Subsection II]. ASTRAZIDA. 
This section is characterised as simple or colonial Madreporaria Aporosa, in which the 
interseptal loculi contain dissepimental endothecz, or are more or less replaced by vesi- 
culate endothecee, with or without tabule, and in which solid intermural coenenchyma is 
rarely developed. 
Family I. Astras. 
oA Il. CyaTHopHyLLiIp&. 
III. Sravripa. 
i IV. CysripHyLiip&. 
These families are accepted much according to their ordinary definition, the differ- 
ences from which, in each case, will be briefly denoted. 
The Cystiphylhide form a fairly natural and distinct family, as is acknowledged, [ 
believe, by all authorities. Its very decided relationship to the Cyathophyllide, on the 
* For Remarks on the Fossula, see Subsection IIT., Astreida. 
* Revision, pp. 36, 46. 
