Note 251 — Chapter VII
Reading edition
In my South Down Fossils, pl. xv. fig. 6, a specimen of this kind is described as a Ventriculite, V. quadrangularis. An admirable lignograph of a remarkable example is given by Mr. Toulmin Smith, under the name of Brachiolites angularis; it presents ten deep, flat, angular folds, and has radicle and lateral processes; see "On the Ventriculidæ," p. 93.