146 



RfiroRT — 1884. 





Bry.,' 'Ann. 'Mag. Nat, Hist.' April, 1870, p. 275), aftor in.spoctiiin^ a 

 Novthcvu ][. n'dlac'U h'om tlio cabinet of Rnv. A. M. Norman, tlioro 

 is ' hardly anytliin<<' in common ' with the two forms. Ho also remarks 

 that ' the pjenns FllifijxirfKt is, as pointed ont by D'Orbigny, intermediate 

 between llnnifirc and Idmoiu'n. ... I am, however, somewhat in donbt 

 as to whether the genus will permanently stand' (/(»•. cit. p. 27''>). Of 

 this I am not .so certain. Filisjxirsa fnlmhisn, Bnsk and Water.s, and 

 F. vnruiHft, Kenss, are neither IdvKmraxwr J [an ur a, ami it seems to me to 

 be far preferable to chai'actorise an intermediate form by a generic name, 

 rather than simplify too much our generic nomenclature. If, however, 

 it can be found that, in dealing with fragments of species of the genus 

 Homera, the differences in character arise from diflerences of growth 

 — like the FciiesfcUd, of the Carboniferous rocks, then tho.se remarks will 

 have no weight ; but so far as I have been able to study species of the 

 genus Ilonicra and FiJisparsa they appear to me as distinct. 



There ai'c a few fossil species of Horneni found in material from 

 several localities in Australia, especially the Yarra Yarra district, but us 

 these have not as yet been described it would appear rather invidious to 

 anticipate ]\Ir. Waters's work, the completion of which — Cyclostomatous 

 Forms — has been promised by him.' 



Before concluding these remarks, it may bo well to refer the student 

 to Mr. liincks' matured opiniou of the genus Homera (Inc. n't. p. 407), 

 because he includes in the one genus the true typical Ilonwra with its 

 ' wavy anastomosing ridges,' and the tubular II. riolacp.a, Sars, which is 

 destitute of the characteristic ' fibrous crust ' found in II. lichenoides, 

 Linnaeus. 



Genus Hoexeka, Lamouroux. 



= Beteimm, (pt.) Goldfuss ; Siphodielavi, Lonsdale. 



Zoarium erect, ramose, sometimes reticulate. Zoo'cia tubular, opening 

 on one side only of the branches, disposed in longitudinal series, the 

 celluliferous surface often traversed by wavy anastomising ridges. 

 Oo?ciuin a distinct chamber, not a mere irregular inflation of the surface 

 of the zoarium, placed dorsally or in front. 



The care with which Mr. Hincks has drawn up the above diagnosis 

 ought to satisfy the ordinary critical student of Fossil Polyzoa, but tlu' 

 most valuable element of structure is the peculiar ocecium. In tlie 

 absence of this, there are other elements which may serve as a guide and 

 a check to overhasty identitication. In his work on the ' Bryozoa of the 

 Maestricht Beds,' &c., Hagenow gave a synopsis of thi' whole of the* then 

 known Hornera, ranging from the Ecccnt to the Upper Silurian. In the 

 last foi'mation the Ilorncra (.•)Y(.s.svf,- Lonsdale, is the sole representative; 

 excc|)ting this no true Homera is given by the author below tlu! ' Kreide- 

 formatiou.' I reproduce below Hagenow's list, because in his work he 

 only describes and figures one species. There are several Ilorui'ra 

 described by Reuss and Bnsk, and there are still many undescvibed forms 

 among the Australian Polyzoa of jMr. A. W. Waters, and also in my own 

 cabinet. 



B. Tertiarformation. 



83. HoKKEUA HiPi'OLYTA, Dcfrance. 



84. „ GRACILIS, Philippi. 



' See remarks ante. 



* Tliis is not a Iforncru, but a Thamnisrns, 



m 



