8 
reference to the genus Coccolepis. The fossil may even he an ohscure speci- 
men of C. anstnilis, preserved merely as an impression covered with a layer 
of soft calcareous material ; Imt in any case it seems advisalde to append a 
l)rief description and ligure for future reference. 
The s])ecimeu is shown of two-thirds the natural size in PI. II, Pig. 3, 
and wants only tlie caudal fui. All the parts, however, are very ohscure, and 
it seems likely that the trunk is accidentally deepened by crushing and by 
the spread of the calcareous material. In the head a feehle semicircular 
depression indicates the forward position of the eye ; and other outlines 
are evidently caused by the large pterygcj-quadrate arcade. The maxilla, of 
the characteristic Paheoniscid form, sliows impressions of a spaced scries of 
large laniary teeth, with an adjoining close series of minute teeth; and 
beneath the ])osition of the mandible there are traces of the short and l)road 
branchiostegal rays. The axial skeleton of the trunk is not exhibited, except 
very feebly at the base of the caudal tin, where there is nothing worthy of 
remark. The rays of all the fins are robust, articulated, and bifurcating 
distally ; but it is not possible to distinguish fulcra. One of the pectoral fins 
displays a few robust anterior rays, Avith A'ery delicate much-divided rays 
behind; and the base of the pehTc tins seems to be considerably extended. 
1'hei‘e are also feeble traces of the series of pelvic fin-su])ports, somewhat 
emphasised in the drawing. The dorsal fin, as preserved, is larger than 
the anal and completely in advance of the latter ; while the position of 
the caudal fin is indicated only hy the bases of a foAV of its inferior rays. 
There are impressions of some Inrge fulcra at the origin of the upper caudal 
lobe. 
SEMIONOTIDJE. 
Ohs . — It lias hitherto been the custom to include among the characters 
of this family the presence of enamelled rhombic scales. There seems to be 
no doubt, hoAvever, that the two remarkable new genera described immediately 
below are correctly placed here ; and yet the second has part of the caudal 
region covered with deeply overlapping cycloidal scales, ornamented only 
with sparse tubercles of ganoine. It Avould, therefore, not be surprising to 
discover a member of the family enveloped entirely in such scales — a parallel 
instance to the inclusion of the genus Cryphitpolepis in the family of 
Palmoniscida^ 
