Paper, 'On the development of the stigmata in ascidians' by Walter Garstang

Description

Garstang writes: 'The respiratory organ or pharynx of the Tunicatae exhibits a great amount of variability in form, size, and complexity of structure in the different members of the group—a variability which is obviously correlated with the physiological value of the organ. In the simplest forms, the Perennichordata or Appendicularians, the pharynx is a mere hollow cylinder, provided with a single pair of tubular gillclefts, one on each side. In the higher forms (the Caducichordata) the cavities of the two gill-clefts become enormously dilated, so as to constitute a pair of peribranchial chambers interposed on either side between the pharynx and the body-walls.'

Annotations in pencil and ink.

Subject: Zoology / Physiology

Received 14 April 1892. Read 19 May 1892. Communicated by Arthur Milnes Marshall.

A version of this paper was published in volume 51 of the Proceedings of the Royal Society as 'On the development of the stigmata in ascidians'.

Reference number

PP/19/19

Earliest possible date

1892

Physical description

Ink and graphite pencil on paper

Page extent

21 pages

Format

Manuscript