358 vine: classifications of cyclostomatous polyzoa. 
genus Entalophora, wliile he uses the term Spiropora for several 
species which would, under the restored nomenclature of Hincks, le 
In their joint memoir on the " Bryozoa of Faxae Limestone,"* 
Denmark, the authors, Drs. Pergens and A. Meunier have formulated 
an entirely new arrangement of the Cyclostomata, so as to meet the 
necessities of grouping species having certain structural affinities, 
which, though not apparent in the more recent forms, are very 
abundant in the whole of the Mesozoic Rocks. So far the authors 
are to be commended, but unless their grouping is studied in con- 
nection with the species grooped together, the student will miss 
many of the liner points brought out by the authors in the arrange- 
ment. It is here, and in the Palieozoic Rocks, that we begin to lose 
the peculiarities on which the classsification of the more recent 
Cyclostomata are based ; and even in his own labours on the Upper 
Tertiary species of Australia, presently to be referred to, Mr. Waters 
has felt the necessity of re-introducing obsolete genera. The 
necessity is increased whenever we deal with the Polyzoa critically, 
as we go backward in time. Dr. Pergens and A. Meunier, arranges 
the Cyclostomata as follows : — 
placed 'under Entalophora . 
Bryozoa, Cyclostomata. 
Family 1. — Stomatoporidse. 
„ II. — Diastoporidse. 
„ III. — Entalophoridse 
Stomatopora, Bronn. 
Diastopora, Lamx. 
Entalophora, Lamx. 
Pustulopora, Blainv. 
Bidiastopora, D'Orbigny. 
Escharites, Hagenow. 
Spiropora, Lamx. 
Sparsicavea, D'Orbigny. 
Idmonea, Lamx. 
Reptotubigera, D'Orbigny. 
Hornera, Lamx. 
Filisparsa, D'Orbigny. 
Bisidmonea, D'Orbigny. 
IV. — Idmoneidse. 
V. — Tubigeridse. 
* La FauDse des Bryozoaires Garumniens de Faxa3. Annals de la Soc. Roy. 
Malacol de Belgeque. Tome xxi., 188G. 
