THE 



GEOLOGICAL MAGAZINE. 



No. LXV.— NOVEMBER, 1869. 



0:RXG-Xl<rJL.JL, JL.lElTXaXj-ElS. 



1. — Notes on Two Ichthxodoeulites hitheeto undbsceibed. 

 By Professor Owen, F.E.S., etc. 



IN a recent inspection of the grand collection of Fossil Fishes in 

 the Museum of the Earl of Enniskillen at Florence Court, his 

 lordship called my attention more particularly to two Ichthyodoru- 

 lites, which he believed to be new. 



I was unable to refer them to any known or named species, and, 

 in compliance with my friend's desire, I here record a brief notice of 

 their distinctive, and, I believe, specific characters. 



The first specimen (see Woodcut, Fig. A.), was //Jft^ 

 discovered and worked out of the coal- shale of ///J/fti 

 Euabon, North Wales, by Lord Enniskillen him- ||/|/ 

 self. It belongs to the rare genus, called Lepra- 

 cantJius by his friend and fellow labourer in Pali- 

 chthyology, Sir Philip Egerton,^ whose intention 

 I fulfil in dedicating the species to his lordship, 

 under the name Lepr acanthus Colei. 



The generic name of this fossil fish-spine refers 

 to the form and serial arrangement of the minute 

 risings or short ridges on the enamelled part, which 

 give it a resemblance to the scaled covering of a 

 ganoid fish. 



The more obvious arrangement of the minute 

 scale-like risings is longitudinal, and nine rows 

 may be counted on each side of the basal half of 

 the ganoin, but the risings are not parallel trans- 

 versely in the several rows ; they project so as to 

 lie in oblique series across the side of the spine, 

 which adds to the resemblance above noted (see 

 Fig. B, magnified portion). The spine is gently 

 curved, moderately compressed, with the back or 

 convex border rounded ; the thinner concave border 

 is armed by relatively large recurved pointed denti- owen!^'"'coltmea?uiA, 

 . cles, sub-compressed and strengthened by an almost Kuabon, n. waies. 

 ridge-like swelling along the middle of each side. These denticles 

 ^ See " Agassiz, Histoire des Poissons Fossiles." 4to. torn. iii. (1842). 



VOL. VI. — NO. LXV. 31 



