TY  - SER
AU  - Holmes, S.C.A. 
TI  - The periproctal plates of Discoidea
KW  - Periproctal plates
KW  - Discoidea
N2  - Extract
The periproctal plates of three specimens are here described and a comparison made with related genera, the latter including a description of the periproctals of Pseudodiscoidea
ER  -