Notebook no 1, 161 ff, 23 cm. Journal of observations on specimens, notes on reading, etc. There are three leaves made at an earlier period at the beginning of the book:
3 'Peculiarity of nerve of Helix', 27 September 1846
5 'Muscular fibres of bee', 24 July 1846
6vo Notes, principally on specimens from the towing net, etc, of various orders of the Coelenterata, from 6 January 1847 to 20 July 1848. These leaves were numbered 11-315 by Huxley
Some of the drawings made to accompany the notes will be found in the volume labelled DRAWINGS 1848-49 [R4] described at number 05199

Volume of drawings of oceanic hydrozoa, 1847-1849, 76 ff, 30 cm
This volume consists of drawings, mainly in pencil, of assorted sizes and on varying kinds of paper, which were perhaps arranged in their present order by Huxley himself; many were reproduced in 'The Oceanic Hydrozoa; a description of the Calycophoridae and Physophoridae observed during the voyage of HMS 'Rattlesnake' in the years 1846 - 1850', published by the Ray Society in 1858. Some were perhaps originally arranged in blue paper folders, of which only the covers now remain, each with a title in Huxley's handwriting; these are:
1 Porpita, Velella. April - May 1847
10 'Diphyes No 1'. Drawings of Diphydae and Physophoridae
18 Physalia. Watercolour
20 'Diphyes No 2'. One drawing. 27 June 1847
22 'Diphyes No 3'. Drawings. May 1847 - July 1848
29 '4 Diphyes'. One drawing. 29 May [?]
32 'Diphydae. Four plates and one unfinished. No structural details - for these must be
another plate - Diphyes Calpe Abyla Rosacea Eudoxia Cuboides Enneagonum'
53 Rosacea. 8 May 1848. Tinted with watercolour
55 Athorbia. 5 May 1858
58 Sheet of notes on Diphydae
64 Stephanomia. 4 May 1848
65-71 Physalia

Notebook No 2, 181 ff, 23 cm
Entries have been made at either end of this volume. It continues the journal of observations
3 Notes on, and extracts from, de Blainville, Kolliker and other writers, on Coelenterata,
Mollusca, etc, with pen and ink and pencil sketches. See especially for these folios
73 - 75 and 82 - 85
105- Notes, from 3 July 1848 to 2 January 1849, on specimens from the towing net, etc;
153 Pteroceras, Cypraea, Sigaretus, Geryonia, etc. There are references to the related
drawings in R4. These leaves were numbered 1-99 by Huxley. See also Drawings
B26 to B31
155 Further notes on reading: Edward Forbes on the 'Naked eyed Medusae', etc, with
pencil sketches
180 Index to the notes

Volume of drawings, 27 ff, 23.5 x 29 cm
Drawings of specimens of Medusae, etc, which are mostly named and dated; they are in pencil, and pencil and watercolour. A few examples are given below. See The Scientific Memoirs of Thomas Henry Huxley volume 1, chapter V, 'Notes on Medusae and Polypes'
1 List of contents
2 Notes on drawings
4 'Xanthea ? Geryonia ?', 16 May. See Notebook no 05196, folio 151, for accompanying
notes
6 Cytaeis. 7 July 1848
8 Cephea. 11 November 1848

Volume of drawings of mollusca and crustacea, 109 ff, 18 x 25 cm
This was formerly volume XVII of the 'Huxley Manuscripts. It consists of a notebook and a drawing book bound together. The former sequence of pages has been preserved in the rebinding
1-14 'Drawing book. CB, 1849. Mollusca and Crustacea, etc'. Detailed pencil drawings,
1849-50; Salpa, etc
1 vo Index
15 'Notebook 1849. CB, 3'
15 vo Index to drawings and notes

The following leaves appear to h ave been reassembled at some unknown date, in the wrong order. All the leaves have been numbered, with odd numbers only, by Huxley. These numbers are given below in brackets. This section is continued in volume 5 of the 'Huxley Papers'
16 Notes, 6 May 1849 (p 1), Diphydae, Echinodermata, Turbellaria
17-26 Notes, 1 - 3 August 1849 (pp 169-189)
27-97 Notes, 1 May - 1 August 1849 (pp 25-167) [page 81 is missing]
98-108 Notes, May - November 1849. They are not in a chronological sequece (pp 3-23)