This form was first made known in 1897, by the late J. F. Whiteaves, in a paper entitled “Description of a new genus and species of Cystideans from the Trenton Limestone at Ottawa” (Canad. Rec. Sci., vol. vii, No. 5, pp. 287–92). This part bears on the wrapper the date “January, 1897”, which is obviously erroneous, since the author dated his own contribution “April 28th, 1897”, and copies of it were first received in London on July 31 of that year.