CARBONIFEROUS FISH-FAUNA, MANSFIELD DISTRICT, VICTORIA. 
EXPLANATION OE PLATES. 
Plate I. 
Eig. 1 . — Gyracanthides murrayi, sp. nov.; one side of type- 
specimen, showing anterior free pectoral spine (a), 
oval plate closing base of posterior free pectoral 
spine ( b ), pectoral fin-spine chiefly in impression 
(c), and dermal tubercles (cl); nat. size. 
la. — Diagrammatic drawing of horizontal section of 
dermal tubercles, showing the pulp-cavity; about 
three times nat. size. 
Eig. 2.— Ditto ; impression of anterior free pectoral spine, 
showing external tubercular ornament and narrow 
smooth inserted base ; nat. size. 
Fig. 3. — Ditto; impression of a larger incomplete sjiecimen; nat. 
size. 
Eig. 4. — Ditto ; abraded imperfect specimen, outer aspect, 
showing texture, nat. size ; also the same, twice 
nat. size (4a), and one ridge further enlarged (lb). 
Eig. 5. — Ditto; imperfect impression of outer aspect; nat. size, 
and also twice nat. size. (5a). 
Eig. 6. — Ditto; two ridges of the preceding specimen; much 
enlarged. 
Eig. 7 — Ditto ; ventral aspect of trunk, lacking head and end of 
tail, showing internal mould of one anterior free 
pectoral spine (a), impressions of part of both 
pectoral fin-spines (b, b l ), internal moulds of the 
pelvic fin-spines (c, c 1 ), impressions of some 
ventral dermal tubercles (d), and both internal 
and external moulds of the small, apparently 
displaced, anal fin-spine (e); two-thirds nat. size. 
7 a. — Internal mould of anterior free pectoral spine ; nat. 
size. 
7 b . — Outer view of dermal armour, showing rounded 
bosses on the tubercles ; magnified. 
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