EXPLANATION OF PLATE. 



Fig. I Sertularia abietlna, natural size. 



^^ " " portion of stipe magnified. 



„ 2 Pbcmulaj-ia pentiatula, 



3 Monoprionidian graptolite, back of stipe, showing axis. 



side view of stipe, showing 



coenosarc. 



front view of stipe, showing 

 cellules. 



. " " showing division of ccenosarc 



into sections, and cellules cut off from common body. 



7 GraptoUtes priodon, showing mouths of cellules opening. 



towards base of stipe. ° 



8 Azygograptus lapworthi. 



9 Didyinograptus iiitidiis. 

 ^° » gibbenihis. 



1 1 Tetragraptus bryonidis. 



12 Dichograptus odobrachiatus. 



13 New species, No. i. 



14 „ „ No. 2. 



15 Diplograptus pristinifonnis, enlarged and restored. 



16 Climacogtaptus anfennarius, 



1 7 Phyllograptiis typus, 



" )} 



18 Dendrograpttis hallianus. -"-THTr-^. 



1 9 Thainnograptus doveri. /^ ^ ,>'?■. ~^sir"'''' "^ 



1 »;'^.;' >* 



