6 Mr. R. Etheridge on Ora^tolites from 



Dvplograptus pristis, Hisinger. PI. III. fig. 18. 



I have referred fig. 18 to this species with some hesitation. 

 There are a series of notch -like projections down each side 

 the stipe, evidently the denticles of the cellules ; and the distal 

 extremity is prolonged and expanded into the small globular 

 body or vesicle often met with in some species of this genus. 

 D. jyristis has previously been recorded from Victorian rocks 

 by Prof. M'Coy*. 



Locality. Newham, near Lancefield, county of Bourke, in 

 blue micaceous shale ; collected by Mr. N. Taylor. 



Genus DiDYMOGRAPTUS, M'Coy. 

 Didymograptus'7 fruticosuSj Hall. PI. III. fig. 19. 



Graptolithus fridicosus, Hall, Grapt. Quebec Group, p. 90, t. 5. figs. 6- 

 8, t. 0. figs! 1-3. 



Frond consisting of two pairs of ascending and slightly 

 curved stipes, arising from the two sides of a long slender 

 radicle. The stipes are celluliferous on the inner or adjacent 

 margin, little divergent at the bifurcation, and continuing for 

 half or two thirds their length nearly straight; above this 



they curve gently outwards Radicle half an inch in 



length. Cellules short and broad .... Aperture wide, apex 

 pointed, scarcely mucronate, and sometimes acutely rounded. 

 {Hall) 



I was for some time in great doubt to what species to 

 refer this form ; but its chief characters appear to approach 

 those of Z). ? [Grapt.) fnUicosuSj Hall, nearer than any other, 

 although three only of the four stipes are preserved. A defi- 

 nite attachment is to be seen between the two remaining right- 

 hand stipes, the second of the opposite side having probably 

 been removed through injury. The cellules are broad, with a 

 wide aperture and pointed apex, which projects without be- 

 coming mucronate. The radicle is not as long as it should be 

 in this species, according to Hall's description. 



Quebec group. 



Locality. Castlemaine, county of Talbot, in hard black 

 shale; collected by Mr. G. H. F. Ulrich. 



Didymograptus nitidus^ Hall., PI. III. fig. 20. 



Gi-aptolitlms nitidus, HaU, Grapt. Quebec Group, p. 69, t. 1. figs. 1-9. 

 Didymograptus nitidus, Salter, Quart. Joura. Geol. Soc. 1863, xix. p. 137, 

 fig. 13, d ; Nicholson, ibid. 1868, xxiv. p. 135. 



Frond composed of two simple stipes proceeding from a 



* Exhibition Essay, 1861, p. 161. 



