139 
Horizon and Localities.— According to McCoy this species is common 
in the Muree Sandstone, at Bell’s Creek and Loder’s Creek ; Mr. Dana 
found it at Glendon, and Mr. M". B. Clarke at Stony Creek, in a yellowish- 
grey, rather friable sandstone, where it is associated with numbers of P. 
hracliytJicerus, Sowerby. Strzelecki found it at Spring Hill, Mount Welling- 
ton, and the Eastern Marshes, Tasmania. 
Genus — BETEPORA ? — Lamarck. 
RETEroKA ? LAXA, L. G. dc Koninck. 
PL VIII, Fig. 5.' 
By this name I designate a very large and beautiful species of Bryozoan 
which will probably become the type of a new genus whenever anyone is 
fortunate enough to find more perfect specimens than those which have been 
sent me. 
The coenoecium forms a perfect network composed of slender branches of 
the same thickness throughout, having no regular direction, and joined together 
directly, so as to produce large fenestrules, irregularly hexagonal and elongated. 
Taken as a whole the tissue looks like an elongated conical cup. I decided 
with ease that the interior surface is smooth, and that the cells are on the 
exterior surface. But on account of the imperfect state of the specimens I 
could not see enough of the exterior to enable me to give a complete and 
perfect description of it. I noticed, however, that it is ornamented with a 
double row of small alternate cells, placed on the inner edges of the fenestrules, 
ten or twelve on each side. I think that these two rows of cells are directly 
adjacent and not separated by a mesial keel as in Fenestella. 
Limensions. — The height is six centimetres ; the superior diameter 
four centimetres ; and the terminal angle 34°. 
Horizon and Localities. — This lovely species, which I can compare 
to no other, seems not uncommon in a brown, rather ferruginous, phtanite, at 
Colocolo and Burragood ; and it is there associated with Ortliis resupinata, 
Martin, and Orttiotetes crenistria, Phillips. 
' [PI. VIII, fig. 6.— W.S.D.] ^ 
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