VINE : CLASSIFICATI >N OF THE PALEOZOIC POLYZOA. 
31 
Genus Berenicea, Lam. 
,, Rhopalonaria, Ulrich. 
11. Family Theonoid.e, Busk. 
,, Scenellopora, Ulricli. 
III. Family Entalopiiorid^, Reuss. 
Mitoclema, Ulrich. 
IV. Family Fenestellid.e, Kino. 
,, Fenestella, Lonsdale. 
,, Polype )ra, M'Coy. 
Septopora, Prout. 
,, Fenestralia, Prout. 
,, Pliyllopora, King. 
Archimedis, Lesueur. 
Lyropora, Hall. '' 
V. FAxMILY ACANTnOCLADID.E, ZiTTEL. 
„ Penniretepora, D'Orb. = ? Glauconome, Lonsdale. 
VI. Family Arthromenid^, Ulrich. 
„ Arthronema, Ulrich. 
„ Arthroclema, Billings. 
In a later publicationt Mr. Ulrich remarks, More extended 
investigations of the large group of Palaeozoic Bryozoa have 
shown me that the classification (as given above) is in some respects 
faulty, and yet more incomplete." In two groups Fenestellidae, King, 
and Acanthocladidae, Zittel, Mr. Ulrich places no fewer than twenty 
genera, and he states that the same synopsis will be adopted in his 
work on the Bryozoa of the State of Illinois (Geol. Surv. of 111., Vol. 
viii., not yet published, Aug. 1888). A few remarks on some of the 
genera retained by Mr. Ulrich may be of use to students of British 
Palaeozoic Polyzoa, for it is useless to pretend that any of our rocks 
will ever yield such a wealth of forms, generic or specific, as the 
American Palaeozoic Rocks have abeady yielded. 
In our own Palaeozoic Rocks we have abundant evidence of the 
presence of the following genera : — 
* Possibly three other Genera Carinopora, Cryptopora, Nich. and Ptelopora, M'Coy. 
t Contributions to A.merican Palseontology, Vol. i., May, 1886. 
