380 REPORT— 1890. 
Division (B.), Crtna. 
IX. Family Crmz.—Genera : Semicea, d’Orb. Discocea, Perg. 
Filicea, d’Orb. Cea, d’Orb. 
Division (C.), Mexiczrririma. 
X. Family Meicertitinz.—Genera: Semielea,d’Orb. Clausimultelea, 
d’Orb. Melicertites, Rom. Hlea, d’Orb. (Retelea ?, d’Orb.) 
At first sight this arrangement of genera may appear to be somewhat 
artificial ; but the family grouping seems to me based on well-marked struc- 
tural, rather than upon mere superficial characters. In the Cyclostomata 
generally there is less to build systematic arrangement upon than in the 
Cheilostomata ; and what little there is has been well investigated by Mr. 
A. W. Waters, as indicated in his Australian papers. There are, how- 
ever, two new divisions (the Crina and MeLicertirrina) introduced into 
Dr. Pergens’ classification, under which some very anomalous and hitherto 
very troublesome species are placed. Of the ‘Cermna’ group, as Dr. 
Pergens remarks, only one living representative exists—Cinctopora elegans, 
Hutton, var. areolata.! At present, however, I know of no living 
representative of the MELICERTITIDA. 
Before leaving this part of my subject, it may be well to give a list of 
Cretaceous Polyzoa referred to by Mr. A. W. Waters in his Australian 
papers; because, if Mr. Waters is correct in his identifications, these 
Australian fossils must be regarded as the remnants of a once wide-spread 
Cretaceous fauna, some few members of which may still be living. There 
is, I must admit, a great difficulty in the way of accepting the views of 
Mr. Waters on this head. The Australian species indicated by him 
closely resemble, I am well aware, those figured by d’Orbigny in 
his ‘ Paléontologie Frangaise,’ but in all identifications of this kind 
there are, or may be, minute points of difference, which ought not to be 
overlooked, and which should influence the paleontologist in his decisions. 
In a letter to me Mr. Jesson remarks: ‘The identity of the Australian 
and Cretaceous forms seems to me to go against the usefulness of Polyzoa 
in determining zones and the age of different deposits.’ Possibly others 
may think so too, if the citation be allowed to pass unnoticed ; and, there- 
fore, the identifications are given on the authority of Mr. Waters. 
CHEILOSTOMATA. 
Vincularia argus,? dOrb. Pal. Fr. p. 253, pl. 689, figs. 1-4.—Mem- 
brampora argus,? Waters. 
Escharina confluens,? Reuss. Verst., Bohm. Kreid. Membranipora con- 
fluens, Reuss, in Geinitz’s Elbthalgeb. ; and Novak. Membranipora 
pedunculata, Hincks, Ann. Mag. Nat. Hist. (5), vol. vi. p. 377. 
—M. confluens,? Waters (p. 262). 
Flustrellaria dentata,? d’Orb. Pal. Fr. p. 525, pl. 725, figs. 17-21. 
Membranipora annulus, Manzoni, Bryoz. Foss. Ital.; and Bryoz. 
Castrocaro.—WM. dentata,? Waters (p. 263). 
' See remarks on this species by Mr. Waters, ‘Bryozoa from New Zealand,’ 
Q. J. Geol. Soc. vol. xliii. p. 341. 
2 Quart. Journ. Geol. Soc. vol. xxxvii. (1881), p. 324. 
3 Tid. vol. xxxviii. pp. 257-276 
