Black Mass
As you can see by the authors, this series went somewhat beyond the scope of OTR horror series.
64/02/29 All Hallows by Walter de la Mer
64/07/03 Rats in the Walls by H.P. Lovecraft
64/07/29 The Man in the Crowd & M S Found in a Bottle by Edgar Allen Poe
64/11/06 A Country Doctor
64/11/07 Atrophy
64/12/19 Diary of a Madman by Nikolai Gogol
65/01/07 The Jolly Corner by Henry James
65/09/14 Bartleby The Scrivner by Herman Melville
66/08/06 The Squaw by Bram Stoker
68/11/20 The Outsider by H.P. Lovecraft
69/09/30 The Death of Halpin Fraser by Ambrose Bierce
69/10/20 The Ash Tree
69/10/24 The Flies
69/10/30 Evening Primrose ( Poor Sound)
70/11/13 Oil of Dog & Esme By Ambrose Bierce
70/11/23 O Mirror, Mirror & Sheeta and Cusiba
70/11/30 Moonlit Road by A. Bierce
xx/xx/xx 1 Five Stories of Lord Dunsany - Lobster Salad
xx/xx/xx 2 Five Stories of Lord Dunsany - The Workman
xx/xx/xx 3 Five Stories of Lord Dunsany - How The Enemy Came To Tan Rhana
xx/xx/xx 4 Five Stories of Lord Dunsany - Dream of Karnavootra
xx/xx/xx 5 Five Stories of Lord Dunsany - Charon
xx/xx/xx A Predicament & the Tell- Tale Heart by E. A. Poe
xx/xx/xx An Evening's Entertainment
xx/xx/xx Haunted House by Virginia Wolfe
xx/xx/xx The Boarded Window by Ambrose Bierce