tacean features in the ontogenies of Limulus and the scorpion, it becomes manifest that the inference of the derivation of these classes from arthropods more primitive than the Crustaceans, seems well founded.
Through the suggestive investigations of Professor Patten, published in his paper On the Origin of Vertebrates from Arachnids and the ingenious speculations of Dr Gaskell as to the origin of the vertebrates from some Limuluslike ancestor, the eurypterids have gained increased interest and some notoriety as possible ancestors of the earliest vertebrates.
VII
SYNOPTIC TABLE OF THE NORTH AMERICAN EURYPTERIDA
Those marked by an asterisk are found in New York State.
Class arachnida
Subclass merostomata (Dana) Woodward
Order eurypterida Burmeister
Family eurypteridae Burmeister
Genus dolichopterus Hall
| Type: | *Dolichopterus macrochirus Hall |
| *D. frankfortensis nov. | |
| *D. latifrons nov. | |
| *D. otisius Clarke | |
| *D. siluriceps nov. | |
| *D. stylonuroides nov. | |
| *D. testudineus nov. |
Genus echinognathus Walcott
| Type: | *Echinognathus clevelandi Walcott |
Genus eurypterus DeKay
| Type: | *Eurypterus remipes DeKay |
| *E. approximatus Hall & Clarke | |
| *E. dekayi Hall | |
| *E. lacustris Hall |
