ON FOSSIL POLYZOA. . 165 
Genus EnraLtopnora, Lamouroux. 
Restricted by the Rev. T. Hincks, ‘ Brit. Mar. Polyzoa.’ 
= Pustulopora, Blainv., Busk, ‘Crag Polyzoa,’ ‘Brit. Mus. Catalogue,’ pt. 3. 
‘Zoarium erect and ramose, rising from a more or less expanded 
base, composed of decumbent tubes; branches cylindrical. Zoccia tu- 
bular, opening on all sides of the branches.’—-‘ Brit. Marine Polyzoa,’ 
. 455. 
The genus Entalophora, as defined and limited by Mr. Hincks, will 
embrace a variety of species. The Spiropora of both Jules Haime 
(Oolitic Polyzoa, ‘B. A. Rep” iii.) and Professor Reuss may be con- 
veniently included. There are, however, so many special features about 
the Spiroporce described by these authors, that I have for a long time 
hesitated whether to continue with, or give up the farther use of, the 
generic name. The clause in the above—‘ composed of decumbent tubes’ 
—may be applied with perfect safety to most of the Mesozoic species, 
and the adoption of the broader term will get rid of a number of genera 
and species that have been founded upon habit only, rather than upon the 
character and disposition of the cells in the zoarium. 
The following analysis of genera and species will enable the palzonto- 
logist to appreciate more fully the varied character of the fossils which 
the genus Hntalophora will cover. 
The first species of Spiropora, Lamx., described by Haime in his 
‘Jurassic Bryozoa’ (1854), is S. elegans, Lamx., from the Great Oolite 
of Ranville. This species is ‘ cespitose’ with cylindrical branches which 
often coalesce. The same species is the Cricopora elegans of Blainville, 
Bronn, Milne-Edw., and Michelin; D’Orb. describes it as Spiropora. 
Another of the species of Lamouroux is S. cespitosa, which, so far as the 
character of the cells may be taken as evidence, may with equal propriety 
be called S. elegans. Some specimens are rather more tufted, and the 
lateral cells are slightly produced. The species is synonymous with S. 
capillaris, Lamx. This is also called by Blainville Cricopora, and Entalo- 
phoraby D’Orb. The Millepora straminea of Phillips (‘ Geol. of York ’) is, 
by Haime, called Spiropora, by D’Orb. Intricaria (1850), Laterotubigera 
(1853), and Entalophora (1854). Our British specimens of this species 
may, to some extent, justify the generic appellation Intricaria, Defranc, 
on account of the continuous inosculation of the branches. I may almost 
affirm that the habit is an unvarying one as regards this species; and a 
similar species found in the Haldon Hill Greensand inosculates in the same 
manner. But as lam following the Rev. Thomas Hincks in his classification, 
it is impossible to accept ‘ habit’ as a generic characteristic in this Report. 
The synonyms of the species are also very significant, and compel us to 
limit the types. I cannot, however, agree with Professor D. Brauns 
(‘ Bryozoa of the Middle Jura’) that Ceriopora verticillata is synonymous 
with Phillips’s species. Other species, also described by Haime as 
Spiropora, are Entalophora, D’Orb. ; or Cricopora, Blainville. Amongst 
Cretaceous fossils a similar mixture of generic terms (founded upon 
habit chiefly) takes place, so that we may regard tbe terms Spiropora, 
Lamx.; Intricaria, Defranc; Cricopora, Blainy.; Melicertites (pars) 
Roemer ; Tubigera, D’Orb. ; Stichopora,-D’Orb. ; Laterotubigera, D’Orb. ; 
Pustulopora, Blainv.; Peripora, D’Orb., as synonyms only of Entalophora. 
It must not be assumed, however, that, in getting rid of anumber of generic 
