Printed letter, 17 February 1887
Printed letter, 17 February 1887
Preliminary notes on new species of sponges from the Quebec group at Little Métis
Postcard, 29 October 1897
Postcard to an unknown recipient
Paper
Page from “Nature”
Page from “Nature”
On spines and spore cases in the Erian rocks
On Rhizocorps in the Palaeozoic revival
On Rhizocarps in the Erian (Devonian) Period in America