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C. Lapworth—Recent Discoveries in Sweden. 33 
sequence both physically and zoologically. His typical section is” 
that of Sularps Beck, near the classical locality of Fogelsing. In 
the Middle Graptolite Schists here investigated Linnarsson recog- 
nizes eight successive paleontological subdivisions or zones, Viz. !— 
(a.) Zone with Phyllograptus typus. 
Immediately upon the Orthoceras Limestone lies a series of green 
and black shales 20 feet in thickness. They are characterized by 
Phyllograptus typus (Hall?), numerous species of Didymograptus, both 
patulous and with parallel branches, and representatives of Diplo- 
graptus Hopkinsoni, Mich., Climacogr. confertus or C. perexcavatus, 
Lapw., and Clim. Scharenbergi, Lapw. : 
(b.) Zone with Didymograptus geminus, His. 
This consists of a black shale, with harder beds of schist. No 
Phyllograpti are visible in this zone, which is characterized by the 
abundance of Didymograptus geminus, His., in association with a 
general fauna resembling that in the underlying zone, together with 
Diplog. foliaceus, Murch., and the genus Corynoides, Nich. 
-(¢.) Zone with Glossograptus Hincksi, Hopk. 
This zone is marked by a species doubtfully referable to Glosso- 
graptus Hincksi, Hopk., which occurs in great abundance. Here we 
find the first trace of the genus Dicellograptus. As in Wales, the 
earliest form is of the type of Dicello. Moffatensis, Carruthers. The 
tuning-forked-shaped (Murchisoni-form) species of Didymograptus 
have all vanished. One only remains with widely spreading branches. 
(d.) Zone with Diplograptus mucronatus 2? Hall. 
In this, the most characteristic fossil is a most peculiar new 
diprionidian Graptolite, with characters superficially intermediate 
between the genera Trigonograptus and Diplograptus. With this 
are found Diplograptus foliaceus, Murch., Diplogr. Hopkinsoni ? 
Mich., Diplograptus teretiusculus, His., Climacograptus caudatus ? 
Lapw., Dicellograptus seatans, Hall, Dicellograpt. Moffatensis ? 
Carr., etc. 
(e.) Zone with Climacograptus Scharenbergi, Lapw. 
This is marked by the abundance of the species after which the 
zone is named ;—a fossil very rare in the underlying zones. Its 
associates are :—Diplograptus foliaceus, Murch., Diplograptus Hop- 
kinsoni ? Mich., Diplograptus teretiusculus, His., and Didymograptus 
superstes ? Lapw. 
(f-) Zone with Dicranograptus Clingani, Carr. 
The dark and pyritous shales that make up this zone contain here 
a few Discinide, together with Diplograptus foliaceus, _Climaco- 
graptus caudatus, Lapw., and Corynoides calycularis, Mich. At 
Terrestadt they are much richer in these fossils, and yield in addition— 
Dicellograptus Forchammeri, Gein., Dicellogr. Morrisi, Hopk., Dicra- 
nograptus Clingani, Carr., Climacograptus bicornis, Hall, and others 
of the same genera, Diplograptus quadrimucronatus, Hall, and a 
Species of Lasiograptus. 
(g-) Zone of Orthis argentea. 
The succession among the Middle Graptolite Schists is closed by 
a series of thick-bedded black schists, principally characterized 
DECADE II.— VOL. VII.—NO. I. 3 
