In the Author's Preface to Poems of Gerard Manley Hopkins, he describes this poem as Curtal-Sonnet "that is they are constructed in proportions resembling those of the sonnet proper, namely 6 + 4 instead of 8 + 6, with however a halfline tailpiece (so that the equation is rather 12/8 + 9/2 = 21/2 + 10 1/2)." - Summary by Wikipedia
