534 REPORT—1885. 
disjunct cells is a character which would seem to have but little real 
significance, for Mr. Hincks says, ‘it seems as an occasional condition in 
species the cells of which are normally continuous, and we have an instance 
of this in the disjunct form of the well-known Microporella Malusii.’ 
Microporella Malusii, Awdouin, form disjuncta, Hincks, ‘Ann. Mag. 
Nat. Hist.’ vol. xv. 5th series, March 1885, p. 249. 
Family XI. Membraniporiide, Busk, 
‘Challenger Report,’ p. 61 
= Membraniporide (pars), ‘ Brit. Mus. Cat.,’ Smitt and Hincks 
= Microporidey (sp.), Smitt and Hincks. 
For other synonyms, see Report. 
‘Zoarium membranous, membranaceo-calcareous, encrusting and 
adnate, or erect and free, foliaceous or lobed, then bilaminar or polygono- 
cylindrical. Zocecia depressed in front with a raised border, the area 
filled in by a chitinous membrane, beneath which may be an entire or 
partial calcified lamina.’—Chal. Rep. p. 61. 
As this very important group is differently arranged by Mr. Busk in 
the above Report than by Mr. Hincks in his ‘ British Marine Polyzoa,” 
and in his papers, ‘Contributions to a General History of the Marine 
Polyzoa,’ I must be pardoned if in this and the following parts of my 
Report I give as full a digest as possible of the views of the different 
authors ; especially so as Mr. Hincks—and others who adopted his classi- 
fication—had made considerable advances previous to the publication of 
the ‘ Challenger Report.’ 
The following genera are contained in the ‘ Challenger’ collection, 
which Mr. Busk arranges as below :— 
. Membranipora, Blainville. 2 sections, a and /3. 
Amphiblestrum, Gray. 
Biflustra, D’ Orbigny. 
. Foveolaria, Busk. New genera. 
. Pyripora, D’Orbigny. No species in the ‘ Challenger’ collection, 
Genus 32. Membranipora, Blainville 
= Membranipora (pars), Blainv., Johnst., Auc. 
= Annulipora, Conopeum, Cellepora, Amphiblestrum (sp.), Gray 
= Cellipora (pars), D’Orb., Hag. = Marginaria, Remer. 
‘Zoarium encrusting, adnate, calcareous or sub-calcareous; zocecia 
quincuncially or serially disposed in transverse rows or irregularly ; no 
internal calcareous lamina ; operculum incomplete.’—Op. cit. p. 62. 
In a note Mr. Busk says that the term incomplete is applied to an. 
operculum whose lower border is membranous and more or less ill 
defined. 
The genus Membranipora, like the old genus Lepralia, has become 
by the addition of many new species almost unmanageable. Hven so as 
restricted as above. Mr. Busk says the ‘ genus Membranipora includes 
so many species that it becomes advisable to subdivide it into sections. I 
am acquainted, either actually or by published descriptions, with between 
thirty and forty living species, to which no doubt copious additions remain 
to be made.’ 
