Scale: Articulata Annelida (12, 13, 14)
Rocks: 3. Silurian system
Fœtal: 1st month, that of an avertebrated animal;
Scale: Articulata Crustacea (15, 16, 17, 18, 19, 20)
Order: Crustacea, Annelida, Crustaceous Fishes
Rocks: 3. Silurian system
Fœtal: 1st month, that of an avertebrated animal;
Scale: Articulata Arachnida & Insecta (21–31)
Order: Crustaceous Fishes
Rocks: 4. Old Red Sandstone