62 



I. W. DAVIS ON PI8H-EEMAINS FOTJND IN THE 



ranee of Ganoids of the genera Palceoniscus, Amhlypterus, and Acan- 

 thodes. The entire absence of Goelacanihus and Megalichthys is also 

 peculiar. The fauna generally is of a Permian type compared with 

 either that of America or Yorkshire ; and the supposition that the 

 beds form an unbroken connexion between the Coal-measures and 

 the Permian formation may happily prove correct. 



COMPSACANTHIJS TEIANGULARIS, Sp. nOV., Davis. Pig. 1. 



Spine. 2-5 inches in length, '2 inch in diameter at mid length, 

 where it is greatest. The spine on the posterior face is straight ; 

 the anterior face is slightly curved. Prom 



the centre the diameter becomes gradually Pig. 1. — Gompsacanthus 

 smaller in each direction ; at the apical triangularis^ sp. nov. 

 extremity it ends in a point; towards the Spine, nat. size, 

 base the spine is thinner and somewhat 

 crushed. The portion which has been im- 

 planted in the muscles contracts in size to 

 about three fourths the greatest diameter. 

 There is a large terminal cavity, which 

 passes up the centre of the spine towards 

 the point, becoming smaller, and the walls 

 of the spine proportionately thicker and 

 stronger, as it ascends. The lateral and 

 anterior surfaces are covered with a com- 

 bination of striations and flutings. The 

 lateral faces are compressed towards the 

 front, which gives a section of the spine a 

 triangular form. The posterior portion is 

 circular ; and the apex is armed with two 

 denticles, broad at the base, compressed 

 laterally, and ending in an obtusely rounded 

 point ; they are placed one behind the other 

 in a single row. 



Locality. Cannel Coal, Tingiey near 

 Leeds. 



The spine described above differs from C. Icevis, Newb., in several 

 important respects. Instead of there being a series of twenty or 

 thirty denticles on the posterior median line, there are only two, 

 and these are not hooked and acuminate ; the spine is shorter and 

 stouter ; its section is triangular. It has only one row of teeth ; and 

 for this reason it is included in the genus Compsacanthus^ Newb., 

 with the specific designation triangularis, in allusion to its triangular 

 form. 



CoMPSACANTHUs MAJOR, sp. Hov., Davis. Pig. 2. 



Spine. Part preserved, 7 inches in length ; with the point, which 

 is wanting, the spine would have been about 7'5 inches in length ; 

 the breadth is '55 inch at the base, and thence to the apex it 

 gradually and regularly tapers to a point. It is straight, and its 



