28?. T. S. Hart: 



countries, a review of the obsea-rations, independently of any 

 such subdivision, seems desirable. 



Havinp: reo'ard to the prominence of the various fossil species, 

 as observed in collectino", the following characteristics of different 

 beds are noticed: — 1. There is a series of beds in which 

 Didymograptiis cachice'}is is abundant and sometimes larsre, often 

 the only fossil collected. With it are Phyllograptus angusti- 

 folius and DIdginograptus nitidus, neither of which I found in 

 other beds, and Tetragraptus quadrihrachiatus , which also occurs 

 in other beds. 



2nd. There is a series of beds characterised by the extreme 

 abundance of D idymogra ptus hifidus, with which Phyllograptus 

 typus is often common, T. bryonoides and T. quadribrarh iatus 

 beinpf the most frequent other fossils in these beds. 



3rd. In the remaining- localities (excluding those from which 

 the observations are too meagre to be safe), Phyllograptus typus 

 m usually common, and practically always present. Other most 

 frequent fossils are Tetragraptus fruticosus and T. bryonoides. 

 D. bifidus is seldom present, and never common in these beds, 

 and T. fruticosus was never obsers'ed in beds in which D. bifidus 

 is common. 



4th. At one locality, 22, with P. typus and T. bryonoides, 

 Clonoyraptus was conspicuous, but neither T. fruticosus nor D. 

 hifidus, nor D. cadureus was noticed here. 



As regards the relations of these beds: — That locality in 

 which Clonograptus is conspicuous is clearly just above beds 

 containing T. fruticosus. 



The bifidus-heds at 14 and 15 lie close to a syncline. Beds 

 with fruticosus appear near the anticlines, on both sides of them, 

 at 11 and 16. 



The bifirlu>^-hed& at 30, 31, 32 lie near an anticline and syn- 

 cline. Whichever of the anticlines this is, it is one on which 

 T. fruticosus appears further north, and the pitch is southerly. 



The 6//7c/u.s--beds at 25 would appear, ajiart from possible fault- 

 ing, to be near the horizon of the surface beds at the South 

 Cornish shaft. From the workings of this shaft 2\ fruticosus 

 was obtained, and further north on the anticline which passes 

 close to the shaft, the same I'ossil also occurs in beds exposed at a 

 much lower level in the gullies. The pitch of this anticline 

 is considerable, and southerly. 



