DAVIDSON, THOMAS - On genera and species of spiral-bearing Brachiopoda, from specimens developed by the Rev. Norman Glass: with notes on the results obtained .... Wenlock and Ludlow Shales.

1881. The Geological Magazine NS (II) VIII; pp. 1-13, 100-109 & 145-156, 21 fig. 1 textplt. with geol. section, 1 plt. h.t. with fossils Orig. extract, stapled, plate with small libr. stamp, very good.