Corallite chains farcimentiform, delicately undulating the margins of the 
fenestrules. Autopores small, delicate, but well developed, oval but square- 
ended, from two to eight in a chain, the average four, three-quarters of a 
millimetre in longest diameter by three-quarters in a contrary direction ; 
walls thick ; septa confined to the autoporal Avails, from tAvo to three cycles 
in each visceral chamber; the latter transversely elongate (parallelogrammatic) 
to nearly square ; tabulae complete, distant, horizontal, concave, or iaoav and 
then rolling, half a millimetre apart. Gonopores numerous, Avell developed, 
large, polygonal or irregular in outline, ahvays larger than the mesopores, 
non-septate ; visceral chambers transversely elongate (parallelogramatic) ; 
tabulae complete, horizontal or oblique, one-quarter millimetre apart. 
Mesopores well developed and constant in position in re-entrant spaces, 
transversely elongate (parallelogrammatic), often double, or by removal of the 
central portion of the dividing Avail horologiform ; Avails thick, but less so 
than those of the autopores ; visceral chambers longitudinally elongate ; 
tabulae complete, horizontal, one- quarter of millimetre apart. 
Obs. — This compact form is the most delicate of our Halysites, and 
although resembling II. pycnoblastoides in its general habit, is distinguished 
by its smaller autopores. 'When viewed macroscopically, the absence of a 
geometric outline to the fenestrules and the farcimentiform appearance of the 
corallite chains Avill at once separate II. gamboolicus from II. lithostrotonoides. 
It is interesting to meet with double mesopores in this species, similar to some 
of those figured by Pischer-Benzon in his H. caver nosed ; when the intervening 
central portion of the new wall dividing these mesopores is broken down, a 
regular hour-glass-shaped figure is the result. The longitudinal or vertical 
sections of the mesopores resemble those of II. australis. 
Loc. and Horizon. — Portion 98, Ph. Gamboola, Co. Wellington 
( C. Cullen). 
Collection. — Mining and Geological Museum. 
Halysites ciiillagoensis, 1 2 sp. nov. 
(Plate V, Figs. 3 and 4 ; Plate VIII, Fig. 3 ; Plate IX, Fig. 3.) 
Obs. — This coral will be described in detail in one of the Reports of 
the Geological Survey of Queensland. 
1 Fischer-Benzon, Abhandl. Gebiete Naturwis. Vcrein Hamburg, V, 2 Abth., 1871, pi. i, f. 2. 
2 In allusion to the locality. 
