38 
Vr- DISTRIBUTION OF THE SPECIES IN LOCALITIES. 
Species. 
Bed a, Spring Creek, 
Barton. 
Bed d, Spring Creek, 
Barton. 
Bed Quarry Creek, 
Barton. 
L. Smith’s station, 
Gamboola. 
Concli i d him Kn ightii 
beds, Bell River, 
L. Smith’s station, 
Copper Hill. 
1 m. west of C. Smith’s 
Homestead, Copper 
Hill. 
Suntop, Ponto-road. 
Guerie. 
bt) 
c 
o 
o 
3 
Mungana, Chillagoe 
Gold-fleld, Queens- 
land. 
Gordon River Lime- 
stone, Liena and 
Mole Creeks, Mersey 
River, Tas. 
Halysites australis 
,, chillagoensis 
,, cratus 
, , gamboolicus 
,, lithostrotonoides ... 
X 
X 
X 
X 
X 
X 
X 
X 
9 
X 
9 
,, orthopteroides 
X 
,, peristephesicus 
X 
,, pycnoblastoides 
X 
,, Sussmilchi 
X 
VII.— CONCLUSION. 
My study of the Australian Halysites compels me to adopt at least one 
general conclusion. However satisfactorily Nicholson’s deductions may suit 
the European species, they will not hold good for the Australian. 
To repeat, Nicholson defined (1) a species with two forms of zooids, 
and no septal spines (H. catenularius, Linn.) ; and (2) a second species with 
one form of zooid only, hut this provided with septal spines (H. escharoides, 
Lamk.). 1 
Amongst the Australian Haly sites we find species (1) with both 
autopores and mesopores and no apparent septa ( H . lithostrotonoides, 
H. orthopteroides, H. Sussmilchi, and II. cratus ) ; (2) with both autopores 
and mesojiores, and septal spines (II. australis, H. pycnoblastoides, 
II. peristephesicus, and II. gambooUcus ) . Possibly, a third group may be 
represented by the Queensland form (II. chillagoensis), in which mesopores 
seem to be absent. 
1 Nicholson’s views received the support of Pofita, as already explained. 
