ANNIVERSARY ADDRESS OF THE PRESIDENT. 



Arenig Species, St. DavicVs. 



Species. 



ElIABDOPHORA. 



Didymograptus extensus, Hall 



affinis, Nick 



patulus, Hall 



bifidus, Hall 



pennatulus, Hall 



sparsus, Hop 



indentus, Hall 



Nicholsoni, Lapw 



Phyllograptus stella, Hall 



typus, Hall 



Trigonograptus truncatus, Lapw. . . . 



ensiformis, Hall 



Ptilograptus Hicksii 



Dicellograptus divaricatus, Hall ... 



Diplograptus dentatus, Brongn 



Climacograptus confertus, Lapw. ... 

 Clematograptus implicatus, Hopk. 



Tetragraptus crucialis, Salt. 



Halli, HopJc 



Hicksii, HopJc 



bryonoides, Hall 



quadribrachiatus, Hall 



serra, Brongn 



Glossograptus ciliatus, Emm 



Crustacea. 



Asaphus Horn f ray i, Salt 



Agnostus hirundo, Salt 



Am pyx Salteri, Hicks 



iEglina grandis, Salt 



Boia, Hicks 



obtusicaudata, Hicks 



Barrandia Homfrayi, Hicks 



Calymene Hopkinsoni, Hicks 



parvifrons, Salt 



, var. Murchisoni, Salt ... 



i S P • 



Cheirurus, sp. 



Ogygia scutatrix, Salt 



peltata, Salt 



bullina, Salt 



Illsenus Hughesii, Hicks 



Illsenopsis ? acuticaudata, Hicks . . . 



Placoparia cambrensis, Hicks 



Phacops llanvirnensis, Hicks 



Trinucleus Gibbsii, Salt 



Sedgwickii, Salt 



Etheridgei, Salt 



Ramsayi, Hicks 



, sp 



Beyricbia, sp 



Carried forward 



Lower. 



11 



Middle. 



Upper. 



18 



22 



