8 Mr. R. Etheridge on Oraptolites from 



are now generally regarded as portions of other more complex 

 species, such as Dichogruptus octohrachiatus^ Didymoijraptus 

 jmtidus, Hall, and others. Prof. Nicholson remarks that, 

 " while not representing a true species, the name may be use- 

 fully retained as a convenient designation for the numerous 

 specimens which are too fragmentary to admit of specific or 

 generic determination " *. Such a fragment appears to be 

 the stipe (fig. 23) provided with the triangular submucronate 

 denticles of this so-called species. G. latus is recorded as a 

 Victorian species by Prof. M'Coyf. 



Localities. Watchbox Ranges, near Baynton's, county of 

 Dalhousie, and Newham, near Lancefield, county of Bourke, 

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



GraptoliiliuSj sp. PL III. fig. 24. 



In this specimen the cellules do not all retain their normal 

 outline. It is probably only a portion of a stipe of a more 

 complex form. Professor M'Coy| has recognized O. tenuis^ 

 Portlock, as accompanying other simple Graptolites in Victo- 

 rian beds ; it may be a variety of this. 



Locality. Newham, in blue shale; collected by Mr. N. 

 Taylor. 



Discarding for the moment the form I have here introduced as 

 Didymog7^aptus Fantom{?), M'Coy, we find that the majority 

 of the foregoing species are particularly characteristic of the 

 Quebec and Skiddaw groups. 



Diplograptus mucronatus is considered in this country to be 

 chiefly an Upper Llandeilo species, but at the same time has 

 been placed as a member of the Skiddaw fauna by Prof. 

 Nicholson §. Its occurrence in Victoria with such truly 

 Quebec and Skiddaw species as here shown will, in some de- 

 gree, tend to confirm this. 



Grouping the species recorded in this communication under 

 their respective localities, we find that they range themselves 

 thus :— 



Watchbox Ranges, Baynton's : Tetragraptus hryonoideSy 

 Hall (Z>. caduceus) ; T. quadrihrachiatuSj Hall ; Diplograptus 

 mucronatus^ Hall ; Graptolitlms latuSj M'Coy. 



Newham, near Lancefield : Tetragraptus quadribracMatus^ 

 Hall ; Phjllograptus typus^HzW. ; Loganograptus Logani^ Hall; 

 Climacograptus ?, sp. ; Diplograptus mucronatus^ Hall ; D. 



* Quart. Joiiru. Geol. Soc. xxiv. p. 141. 



t Exhibition Essay, 1861, p. 161. | Loc. cit. 



§ Quart. Journ. Geol. Soc. 1868, xxiv. p. 139. 



I 



