1. Atractosella, a Silurian alcyonacean coral;BENGTSON;Journal of Paleontology,1981
2. New species of fossils from different parts of the Lower, Middle and Upper Silurian rocks of Canada;BILLINGS;Geological Survey of Canada, Paleozoic Fossils,1862
3. Notice of some new genera and species of Paleozoic Fossils;BILLINGS;Canadian Naturalist and Geologist, New Series,1865