I^•TROD^JCTIO^^ 
XXXV 
Entalophoridie 
Fasciporidue ... 
Fascigerida* . . . 
Lichenoporidic 
Cerioporidae . . . 
? Ceramoporidaj... 
? Fistuliporidic ... 
? Ceid.e 
'i Melicerititid® ... 
Entalophora, Spiropora, Feripora, ? Clausa, ^ Petahpora^ 
and the Palaozoic Mitroclema, Liploclema, and 
Clonopora. 
Faseipora, Se/nifascipora, Conotubipera, and Serietnbipera. 
Fill fascig era, Reptofascigera, Theonoa, FascicuUpora, 
Frondipora, Unicgtis, OscuUpora, Truncatula, Fesmeo- 
pcrra, Cyrtopora, and Flethopora. 
Discocytis, ^psendesia, Liclienopora, Stellocavea, and 
? Multicavea. 
Ceriopora, Heteropora, Heteroporella ,? Ditaxia, Chilopora, 
Neuroj)ora, and Acanthopora. 
Ten Pahcozoic genera, viz., Ceramopora, Ceramoporella, 
Crepipora, Anolotichia, Diamesopora, Ceramophylla, 
Chiliporella, Bythotrypa, Scenellopora,im^ Spatiopora. 
Eleven Palaozoic genera, viz., Fistulipora, Cyclotrypa, 
Fridopora , Chilotrypa, Meekopora, Strotopora, Licheno- 
trypa, Buskopora, Selenopora, Pinacotrypa, and 
? Botryllopora. 
Semieea, Cea, and Filicea. 
Semielea, Flea, and Meliceritites. 
The foregoing sketch of the classifications of the Cyclostomata 
shows that this group is the subject of unusually complete 
divergence of opinion as to the number of subdivisions required 
and as to their respective affinities. And some authors seem to 
regard a satisfactory classification as so unattainable that they make 
no attempt to collect the genera into families. This unprogressive 
policy is, however, useless for the description of large fossil faunas. 
The general trend of opinion may be gathered from the previous 
summary of fifty years’ progress, which shows the growing 
recognition for a more complex classification than is necessary 
for the living fauna. Palaeontologists recognize the need for 
a considerable number of faniilies. Thus Meunier & Pergens 
in 1887 adopted nine, and Ulrich in 1900 adopted twelve. 
In this Catalogue I feel bound to accept fourteen families of 
Cyclostomata in addition to three of Trepostomata. 
The classification of the Cyclostomata is simplified by the 
separation of the Trepostomata, and it seems to be now generally 
recognized that the latter form a natural group. Ulrich’s foundation 
of that Order satisfied a want that had been felt even as early as 
by Busk in 1859. 
The parallel growth of the zooecia, though the most conspicuous 
character of the Trepostomata, would, however, alone be inadequate. 
