338 Mr. C. Lap worth on the Geological 



From similar beds at Orleans Island, Gros Maule, and the 

 river St. Anne, Hall describes: — Didyrnograptus similis, H.; 

 Tetragraptus fruticosus, H. ; T. Headi, H. ; Dichograptus 

 octonarius, H. ; Clonograptus Eichardsoni, H. ; and Phyllo- 

 graptus Anna, H. 



Of these Quebec forms Tetragraptus Headi, H., T. bryo- 

 nides y H., Phyllograptus angusttfoliics, H., and P. typus, H., 

 were subsequently detected in corresponding strata on the 

 coast of Newfoundland *, where their association with Crus- 

 tacea &c. of Tremadoc and Arenig types, as at Point Levis, 

 is demonstrative of their systematic place at or near the base 

 of the Ordovician. 



Australia. — Mr. R. Etheridge, Jun., and Professor M'Coy 

 have recently described a small collection of Pthabdophora from 

 the lowest Ordovician rocks of Australia f, which is remark- 

 able for its general identity in facies with that of the Arenig 

 rocks of England and Canada. The species figured are pos- 

 sibly : — 



Loganograptus Logani, Hall. Dichograptus octobrachiatus, Hall. 



Goniograptus Thureaui, HP Coy. Phyllograptus typus, Hall. 



Tetragraptus bryonoides, Hall. Retiograptus tentaculatus ?, Hall. 



quadribrachiatus, Hall. Didymograptus Pantonii, M' Coy. 



i'ruticosus, Hall. nitidus, Hall. 



together with indeterminable species of Climacograptus and 

 Diplograptus. 



Llandeilo Formation. 



Dr. Hicks breaks up the Llandeilo formation of Wales into 

 three portions, the well-known limestones and calcareous 

 shales of Llandewi Felfry and Llandeilo forming the central 

 member. This arrangement, though not universally applica- 

 ble, may possibly be the natural one in the southern districts. 

 There the Lower Llandeilo consists of dark carbonaceous shales 

 and thick beds of coarse sandstones, with occasional igneous 

 rocks of contemporaneous age, the Middle Llandeilo of cal- 

 careous flagstones, and the so-called Upper Llandeilo of soft 

 dark grey flags and mudstones, forming a gradual transition 

 into, and only doubtfully separable from, the overlying Bala 

 formation. 



In the Lower Division, as seen to the west of Shelve, I 

 have collected Didymograp>tus Murchisoni, Beck, in some 

 abundance, and in corresponding strata below as well as 



* Logan and Billings, Geology of Canada, pp. 291, 293, 872. 

 t R. Etheridge, Jan., Annals and Mag. Nat. Hist., July 1874; M'Coy, 

 Prodromus Palaeontology Victoria, decades i., ii., and v. 



