224 
Hineks ,* * * § iu Tiis description of BhaMopleiim, bear very pertinently on this point. He 
gavs “ The relation of the polypitle to its dwelling in EliaMopleMra is totally unlike 
that to wliich we arc accustomed in tlie ordinary polyzoon The polypide is 
therefore wholly unconnected with its cell. ... Its only connection is 
cylindrical chitinous rod, enclosing a soft cellular core, and traversing the whole of the 
adherent portion of the zoarium.” 
This anomalous structure is not present in Blwmhopora. and I must confess to 
being quite at fault in attempting to account for Mr. Ulrich’s reason for placing such 
widely different genera in the same family. Under these circumstances the above 
family is adopted after Waagen. _ 
By Zittel t this genus has been placed in the Oerioporidee, but this is eqiially 
inadmissible. I have already called attention J to the probability that the British 
Carboniferous Polyzoon named Ceriopora interporosa, PliilL, and G. stmilis, Philh, were 
referable to Bhomhopora, and I am glad to find that Mr._ Ulrich confirms my opinion as 
regards the former after an examination of its microscopic structure. 
Genus— BIIOMBOPOBA, Meeh, 1872. 
(Hayden’s Heport E. Nebraska, p. 111). 
EiiOiiBOPOHA liAXA, TStJieridge, sp., PI. 9, figs. 8 and 9. 
Ceriopora ? laxa, Etheridge, Quart. Journ. Geol. Soc., 1872, xxviii., Pt. 3, p. 332, t. 25, f. 2 and 2a. 
nhomhopora ? lam, Etheridge fll.. Cat. Australian Foss., 1878, p. 46. 
Sp Char. Polyzoarium loosely dendroid ; branches sub-cylindrical or eoinpresse , 
bifurcating twice or thrice; cell-apertures small, equal, apparently round, and opening 
obliquely upwards and outwards, arranged in quincunx. Spiniform tubuli not observed. 
Ohs. Mr. B. Etheridge, E.E.S., who described this species, states that « 
possessed afSnity with Bhomhopora serialis, Portlock,§ from the Carboniferous rocks o 
Hook Point Wexford, although the cell-apertures are neither so densely nor so regularly 
arranged as ’in that species. My Colleague has obtained what may be considered a large 
variety of this species, differing, however, in no other particular than that of size from 
the original specimens. B. laxa has hitherto been met with only as natural sections, 
and the surface characters are in consequence unknown. 
Loc. and Horizon. Gympie ( The late B. Dainiree. and B. L. Jack) ; Ehynchonel 
Creek, Stan well, near Eockhamptou {The late James Smith)— Beds. ^ ^ 
The Polyzoa in the green ehloritic rock of Gympie are seldom recognisable, bu 
are usually preserved merely as black or very dark, apparently carbonaceous, stains, an 
are therefore more than ordinarily difficult to determine. In addition to P rotor etepo 
there is a form with a strong resemblance to Beiepora ? laxa, He Koninck,!! m 
irregularity of growth, but it may perhaps be only a Protoretepora rendered roug 
irregular by the hackly fracture of the stone. A third form, either FenestelM 
Polypora, of a stiff and rigid appearance, possessing very large, square, oblongf cues ru > 
appears to be a characteristic species. The interstices are straight and regular, an 
dissepiments at right angles (PI. 8, fig. 9). 
* Hist. Brit. Marine Polyzoa, 1880, p. 577. 
t Handb. Pal. Bd., i., p. 009. 
i Ann. and Mag. Nat. Hist., 1887, xx., p. 30. 
§ Report Geol. Londonderry, Tyrone, &c., 1813, p. 327, t. 22a, f. 6. 
H Foss. Pal. Nouv.-Galles du Sud, 1877, Pt. 3, t. 8, t. G {See PI. 8, figs. 10 and 11.) 
