THE EURYPTERID FAUNAS AND ASSOCIATED ORGANISMS
In the following lists the eurypterid faunas of the various occur- rences is given, as well as the organisms other than eurypterids which are found associated with them. No account is taken here of single occurrences or of the presence of a few fragments in normal marine faunas.
ORDOVICIC
Normanskill Fauna.
Eurypterids.
Dolichopterus breviceps
Eusarcus linguatus
Eurypterus chadwicki
Pterygotus ? nasutus
P. normanskillensis
Stylonurus modestus
Associated organisms. Seaweeds and graptolites.
Rhombodictyon
Climacograptus bicornis
C. bicornis var. peltifer
Cryptograptus tricornis
Dicellograptus gurleyi
Schenectady Fauna.
Eurypterids:
Dolichopterus frankfortensis
D. latifrons
Eurypterus ruedemanni
E. pristinus
E. ? stellatus
Eusarcus ? longiceps
E. triangulatus
Hughmilleria shawangunk
Pterygotus ? nasutus
P. prolificus
Stylonurus limbatus
Associated organisms.
In sandy shales, seaweed, Sphenothallus latifolium
In black shales, graptolites and trilobites
Climacograptus bicornis
Triarthrus becki
SILURIC
Earliest Lower Siluric (Ee1.) Fauna of Bohemia.
Eurypterids.
Eurypterus acrocephalus
Pterygotus barrandei
