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PROCEEDINGS OE THE GEOLOGICAL SOCIETY. 



species are new, and also many of the genera. The species as- 

 signed by the author as having most zoological value are Conocoryphe 

 monile, Salter, Olenus Salteri, Call., Olenus triarthrus, Call., Agnostus 

 dux, Call., Lingulella Nicholsoni, Call., Obolella sabrince, Call., 

 Asaphus {Asaphellus) Homfrayi, Salt., Asaphus (Platypeltis) Croftii, 

 Call. 



Mr. Callaway also draws comparisons between the Shineton, 

 Pedwardine, and Malvern series, showing their relations and affinities. 

 All the species in the Shineton Shales are new except three, viz. 

 Conocoryphe monile, Salt., Asaplius {Asaphellus) Homfrayi, and 

 Dictyonema sociale; the fauna is therefore nearly unique. Mr. 

 Callaway suggests that the Shineton Shales may be passage-beds 

 between the Lingula-fLags and the Lower Tremadoc : the presence 

 of Dictyonema sociale strengthens this view ; it is an Upper Lin- 

 gula-nag species at Malvern, Pedwardine, and North Wales in 

 many places, also a well-known Tremadoc form in the latter 

 area. Mr. Callaway ably discusses the physical features of the 

 Shineton area. He describes fourteen new species, and establishes 

 two subgenera of Trilobites, Asaphellus and Platypeltis, and two 

 genera, Conophrys and Lichapyge ; he also determines and describes 

 a remarkable Cystidean, possessing a slender crinoidal-like stem and 

 simple calicular pinnulae, which he names Macrocystella Marice. At 

 present we know of no true Tremadoc rocks in the Stiperstones area ; 

 nor, indeed, are we sure of the presence of the true Lingula-flags in 

 that district west of the Longmynds, unless the Stiperstones them- 

 selves represent them ; but of this we have no organic proof, the 

 series succeeding being Arenig or Skiddaw, formerly mapped and 

 named Lower Llandeilo by Sir Roderick Murchison and the Survey. 

 Mr. Callaway believes from recent research that the quartzites of 

 the Stiperstones are of Arenig age, and therefore distinct from the 

 quartzites of the Wrekin, deducing his opinion from the fact that 

 when they are conglomeratic the pebbles in the Arenig quartzites 

 are mainly quartz, while the included fragments of the Wrekin 

 quartz rocks are felsitic. Again, Mr. Callaway believes that he has 

 detected the Shineton Shales (Lower Tremadoc) at the base of the 

 escarpment of the Stiperstones dipping under the Arenig series in 

 the same direction as the rocks of that formation, i. e. W.X.W. 



There is little or no specific palaeontological affinity or com- 

 munity between the Tremadoc and Arenig groups in any known 

 area in North or South Wales, although they are everywhere con- 

 formable. No Tremadoc rocks have yet been proved to occur above 

 the Lingula-flags in the passes of Llanberris and Nant Francon or 

 the adjoining regions, where the latter rocks are so finely and fully 

 developed ; neither is it yet qnite certain that they occur in An- 

 glesey. A few fossils lately found by Professor T. M'K. Hughes 

 lead to a strong suspicion that the northern half of the island may 

 yet yield a Tremadoc fauna. The singular Trilobite, Neseuretus 

 ramseyensis, Hicks, found by Professor Hughes at Ty-hen near Llan- 

 erchymaedd, has not hitherto occurred in North Wales, but only on 

 Eamsey Island and at Tremanhire (St. David's) ; and other remains 



