EXPLANATIONS OF PLATE V. 
GRAPTOLITHUS QUADRIBRACHIATUS, page 91. 
. A large specimen with stipes vertically compressed. 
. A young specimen in which one of the stipes appears to be subdivided. 
. An individual with stipes a little curved, the back of the stipe visible, and 
showing no serratures. 
. A frond with one of the stipes broken off; one showing the cellules and dis- 
tinct strie parallel to the cell-partitions, while the other two are turned so 
as to obscure the cellules. 
. An enlargement from fig. 1: the stipe has been vertically compressed, causing 
the cellules to show a less angle with the stipe than in the normal condition. 
GRAPTOLITHUS FRUTICOSUS, page 90. 
. A small individual with the extremities of the radicle and stipes broken off. 
. An enlargement from fig. 6. The serratures are either imperfect or shrunken, 
and do not present the characters seen in better-preserved specimens. 
. An individual nearly entire, with an extremely long and slender radicle, but 
imperfectly preserved in the outline of its parts. 
GRAPTOLITHUS PENNATULUS, page 82. 
Fig. 9. Asingle stipe of this species? The specimen isa large stipe, somewhat obscurely 
preserved upon the surface of a slab of slate, with G. extensus, G. bryon- 
oides, and Phyllograptus ilicifolius. It is from the same locality with 
G. bifidus at Point Lévis. In the form of the stipe, and its gradual diminu- 
tion towards the distal extremity, as well as in the absence of visible pus- 
tules at the base of the cellules, it has the habit of G. pennatulus. Being 
the only individual observed from this locality, and the resemblance to 
G. bifidus being very close, I have referred it with much hesitation to 
G. pennatulus. 
GRAPTOLITHUS CRUCIFER, page 92. 
Fig. 10. View of the specimen from which the description is drawn. 
“ce 
13. The dise of a young individual probably of this species. 
GraprTouitHus Hzapi(?) page 94. 
Figs. 11 and 12. The central discs of two individuals which may belong to G. Headi. 
