CANOMUS KA.MSAYI. 



173 



hinder margin of the maxilla. The maxilla forms posteriorly a rather broad and 

 somewhat rhombic-shaped plate, whose anterior angle passes into a narrow process 

 extending on below the orbit. The mandible is small, straight, and slender; below it 

 are seen a few branchiostegal rays or plates. Immediately in front of the antero-superior 

 margin of the preoperculum, and touching the maxilla below, is a narrow and slightly 

 curved suborbital, and again in front of this is a circlet of narrow ossicles, whose number 

 cannot be ascertained, surrounding the entire orbit, The orbit is large, and is situated 

 immediately behind the rounded snout, and above the anterior part of the maxilla. 



Like the bones of the cranial roof, those of the face are ornamented externally with 

 tortuous flattened rugae, except the mandible, which is marked with finer and nearly 

 parallel ridges running from behind forwards with a slight obliquity towards the superior 

 margin. 



No teeth are visible on either jaw. 



Fig. 12. — Restored outline of Canobius Rams ay i, Traqunir. Slightly enlarged. <?., supercthmoid ; /., frontal • 

 !««., mandible; m.r., maxilla; op,, operculum; or., orbit; p., parietal; p.t., post-temporal; pop., preopcr- 

 culura; s.op., suboperculum. 



The bones of the shoulder-girdle are constructed on the usual Palseoniscid type, and 

 are ornamented with flattened ridges like those of the head. 



The scales of the body are arranged as usual in dorso-ventral bands, of which 34 may 

 be counted between the shoulder-girdle and the commencement of the lower lobe of the 

 caudal fin. They are of moderate size, largest on the anterior part of the flank, smaller 

 dorsally and posteriorly, and low and narrow on the belly. A row of especially large, 

 median, imbricating scales runs along the back from the occiput to the commencement 

 of the dorsal fin. These median scales are marked each with a few tolerably well- 

 pronounced longitudinal ridges, as are also the imbricating V-scales of the upper caudal 

 lobe ; but the body-scales in general are comparatively smooth, being marked only with 

 faint ridges and furrows, proceeding somewhat diagonally from before backwards and 

 downwards, and which usually stop short before they arrive at the posterior margin of the 

 scale ; in many specimens these striae are nearly entirely obsolete on the scales below 

 the lateral line. There may also often be observed on the flank-scales a number of very 

 delicate vertical grooves close to and parallel with the anterior margin of the ganoid 



