A NEW CEETACEOUS FI SB. 
91 
evidence of a tumid extension in the anterior part of the symphysis. On the left 
mandible much of the lateral surface has been abraded, exposing an extensive area 
representing Meckel’s cartilage. Fortunately the right mandible has been preserved^ 
as exposed from the matrix, and it is no less than 230 mm. in length. It is relatively 
slender in its anterior portion, the lateral surface of which is prominently convex. 
The dentigerous area, as exposed, is a broad platform extending backwards for at 
least half the length of the bone. Anterioi’ly this area extends on a prominent wing- 
like process over the lateral border of the dentary. Numerous multiserial villiform 
teeth are preserved, many of which are in sitv, but for the most part they are 
rexjresented by a close-set mosaic of circular bases. Although most of the teeth were 
villiform, there is evidence of slightly larger units, w^hich may be described as conical 
with somew^liat curved tips, but all of these teeth are relatively very small. (Text- 
figures 1 and 2.) 
Text-figures 1 and 2 . — Flindersickthys denmeadi. Sections of mandible showing bases of villiform 
teeth exposed from matrix (partly diagrammatic). 
The coronoid elevation is incomplete on the left side, but it is evident that it 
was prominent and in keeping Avilli tlie massive proportions of the mandible. The 
preserved portion gives the left mandible a depth of 02 mm. in this region. The right 
coronoid is hidden in matrix. 1’he area of the articular on the lateral surface is 
considered to be confined to the posterior fifth of the mandible, but the junction of 
the tAVo elements is obscured. On the left side the actual articulating surface for the 
condyle of the cpiadrate is incomplete, and the right ramus show^s that the ])osterior 
portion is curved upwards behind the actual fossa. 
Within the gape is a displaced fragment from the u])per jaw% 40 mni. in length, 
which exhibits a dentigerous area, slightly convex in transverse section, containing 
the bases of villiform teeth similar to those of the mandible. This fragment is almost 
certainly a portion of the left premaxilla. Judging from the dimensions of the 
mandible and the maxillee., the inemaxilla.' w'ere relatively small, curved elements, such 
as are characteristically found in Lower Cretaceous fishes. 
