Shells of Endothyrella species. A Endothyrella plectostoma (Benson, 1836), UMZC 102155 (syntype, specimen figured by Gude 1897b) B Endothyrella plectostoma, SMF 118091 C Endothyrella sowerbyi (Gude, 1899), NHMUK 1922.8.29.48. (holotype) D Endothyrella sowerbyi, SMF 346408 E Endothyrella tricarinata (Gude, 1897), UMZC 102170 (syntype of tricarinata) F Endothyrella tricarinata, NHMUK 1922.8.29.50. (syntype of exerta) G Endothyrella affinis (Gude, 1897), NHMUK 1922.8.29.26 (syntype). Photos: J. Gundry (A, E), B. Páll-Gergely (B, D) and H. Taylor (C, F, G). Scale represent 5 mm.