Devonian.] PALEONTOLOGY OF VICTOEIA. [A>,ima!s. 



sides to the nan-ow rounded inner side. It is most nearly allied to 

 the Phragmoceras subventricosum of d'Archiac and de Verneuil from 

 the Devonian limestone of Gerolstein in the Eifel (in which I find 

 traces of similar longitudinal ridging, although not referred to in 

 their description), but that has a regular transverse oval section with 

 the inner side as broadly convex as the outer one, and the siphon 

 is smaller than in ours. The Cyrtoceratites lineatus ( Gold. ) of the 

 Eifel, and the C. plano-excavatum (Sand.) from Craniberg Nasau, 

 are nearer in form of section and ribbing, but have the siphon on 

 the convex or outer side of the general curve. 



In the Middle Devonian limestone of Buchan, Gippsland. 



Explanation of Pigukes. 



Plate XXXV. — Pig. 6, view from inner side, natural size, showing the wave there of the 

 septa, and the position of the siphuncle on the septum at upper part. Fig. 6a, end view of 

 septum of same imperfect specimen, showing form of the section and place of siphuncle. Fig. 66, 

 side view, showing arched tapering form, sigmoid bend of septa, and longitudinal sulcation. 



Plate XXXV., Figs. 7-7b. 



ASTEROLEPIS ORNATA (Eichwald). Var. AUSTRALIS 



(McCoy). 



[Genus ASTEROLEPIS (Eichwald). (Sub-kingd. Vertebrata. Class Pisces. Order 

 Ganoida. Tribe Placodermata.) 



Gen. Char. — Body with an exoskeleton of large thick flat bony plates, the external surface 

 of which is covered with a layer of ganoine, sculptured into round smooth tubercles, radiated at 

 base with numerous short narrow ridges ; the tubercles sometimes running into one another to 

 form short ridges. Exclusively Devonian.] 



Description. — Plates of body covered with close stellated tuberciilation ; 

 tubercles rounded, sub-equal, smooth, each with about 12 short radiating ridges 

 nearly equally spaced round its base, irregularly placed, averaging less than their 

 diameter apart, rarely arranged more closely in lines, and rarely anastomosing into 

 short vermicular ridges. Average number of tubercles, 5 in .3 lines. Interstices 

 between the tubercles granulo-punctate. Thickness of plates, about 2 lines. 



Reference. — (Ag.). Poissons Fossiles des Vieux Gres Rouge, t. 2da, f 25 ; 

 t. 30, f. 2-9 ; t. 30«, f. 5-9. 



All the figures in Agassiz' work have the tubercles too large and 

 too far apart compared M'ith the originals from the Russian Old Red 



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