MANSFIELD DISTRICT, VICTORIA. 
Ctenodus breviceps, sp. nov. Plate VIII, fig. 12 ; Text-fig. 3. 
Type . — Hinder part of cranial roof (Text-fig. 3). 
Specific Characters . — Median occipital plate more than two- 
thirds as hroad as long, and its extreme length about equalling 
that of the pair of plates immediately in front. 
Cranial Roof . — The roofing hones of the hinder half of the 
skull are partly preserved in the type-specimen (Text-fig. 3), 
partly shown as an impression of their outer face on the matrix. 
The impression proves that they were not externally ornamented, 
their only markings being the usual fine radiating lines of growth, 
which cause the sutures between the various elements to be 
plainly visible. The median occipital plate (O) is shaped as in 
the typical Ctenodus cristatus from the English Coal Measures, 1 
hut differs in being rather broader in proportion to its length. 
The posterior median pair of plates (I) also agree with those of 
the type-species except that they are relatively broader; and 
there seems to have been the usual small median plate (O 1 ) 
between their divergent anterior ends. There is nothing worthy of 
remark concerning the lateral paired plates (II, III) so far as they 
are preserved, except that they likewise proove the skull to have 
been shorter and broader than in the type-species just mentioned. 
Fig. 3. — Ctenodus breviceps , A. S. Wooclw.; part of occipital end of cranial loof, 
three-quarters nat. size. 0, median occipital plate ; O 1 , position of small median 
plate further forwards; L, II., III., paired plates. 
1 A. S. Woodward, “ Catal. Foss. Fishes B.M.,” pt. ii. (1891), p. 252, pi. iv., fig. 1. 
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