Benedenius deneensis, Traquair. 447 



which may be due to its extremity being imbedded in the 

 matrix. 



Ou the evidence of the material now uvailable it appears 

 that the depth of the body is contained 2 to 2f in the total 

 length (without caudal fin), the length of the head 4 to 4^. 

 The caudal peduncle is much deeper than long and the length 

 ol the caudal fin is contained about 4 times in the total. 



The following measurements are taken from specimen A: — 



millini. 



Total length ■2'dO 



Length of head 48 



From head to caudal fiu 170 



Caudal fin (end imperfect) 76 



Greatest depth of body 100 



Length of caudal peduncle 22 



Depth of caudal peduncle 31 



From head to dorsal fin (in a straight 



line) 102 



From head to ventral fin 79 



From head to anal fin 125 



Length of dorsal fin 58 



Greatest depth of dorsal fin 40 



Length of anal fin 25 



Greatest depth of anal fin 40 



Length of pectoral fin 46 



The dorsal fin, high and pointed in front, low behind, 

 formed o£ 54 slender, distally bifurcating rays, originates 

 just behind the vertical of the base of the ventrals and twice 

 as far from the base of the caudal as from the end of the 

 snout. Van Beneden says, " S'il y a des ^cailles sur le bord 

 ant^rieur, clles doivent etre extrfemement petites." Traquair, 

 notwithstanding the imperfect condition of the fossil, recog- 

 nized the presence of fulcra, but could not have given a quite 

 exact representation of them, nor are they correctly shown in 

 Fraipont's figure. There is a series of well-developed fulcra 

 along the anterior border of the fin, as much developed as in 

 Eurynotus^ and these fulcra are a prolongation of tiie enharged 

 dorsal scales or ridge-scutes, wliich extend both in front and 

 behind the dorsal, not to midway between the fin and the 

 head, but right to tlie occiput. The posterior half of the base 

 of the dorsal fin happens to be denuded of scales in specimen 

 A, and shows well the distal endoskeletal fin-supports (baseosts) 

 as short stout bones, somewhat hourglass-sliaped, one to every 

 three rays. 



Fraipont represents the dorsal fin as short, formed of 25 

 rays and ending above the origin of the anal. This condition 



ao* 



