Plants:
Pachytheca, etc.
c. Old red sandstone of Lorne
Eurypterids:
Pterygotus cf. anglicus
Fishes:
Cephalaspis lornensis
Mesacanthus
Thelodus (?)
Ostracods:
Aparchites
Isochilina
Beyrichia
Chilognathous myriopods:
Kampecaris
Archidesmus
Plants:
cf. Psilophyton
d. Upper old red sandstone fauna of Ireland
Eurypterids:
Eurypterus hibernicus
E. scouleri?
Fluviatile pelecypod:
Amnigenia (Anodanta) jukesii
Fishes:
Coccosteus
Plants:
Archaeopteris
Bothrodendron
Calamites
Sphenopteris
Stigmaria
Ulodendron
In the preceding lists only those faunas have been given which are abundantly represented in species and individuals, and which may, therefore, be considered characteristic. Of all the faunas cited, that from the waterlimes of Oesel, while not containing the largest number of species, is yet the one which is preëminently representative. The eurypterids undoubtedly lived and died in the muds now forming the waterlimes, the remains which are found there having suffered practically no transportation, as we may judge from the perfection of preservation and the entirety of individuals. The specimens of Eurypterus fischeri occur in greater numbers and in a more perfect state than do those of any other known species, and the exoskeletons are not only not compressed, but they even show the origi-
