98 
Stratigraphic a l Collection , Footprints , fyc. 
Gallery, No. 
11 . 
Davidson 
Collection, 
1837 - 86 . 
Stratig-ra 
phical Col- 
lection. 
Sowerby 
Collection. 
Cephalo- 
poda. 
Rocks bored 
by Mollnsca. 
Tracks and 
Marking-3. 
Footprints. 
and 234 plates, with 9,329 figures, and descriptions of 969 
species ; the plates having been drawn with his own hands. 
Dr. Davidson was also the author of the Report on the 
Brachiopoda collected by H.M.S. “ Challenger” (vol. 1, 1880) ; 
of the article “Brachiopoda,” in the “Encyclopaedia Britannica,” 
Ninth Edition, 1875 ; of a Monograph of Recent “ Brachiopoda” 
( 1 rans. Linnaean Society, 1886 and 1887), and of more than fifty 
other separate Memoirs mostly bearing upon Brachiopoda, both 
Recent and Fossil, printed in the Transactions and Journals of 
the various learned societies, etc. 
His collection, both of Recent and Fossil Brachiopoda, 
together with all Dr. Davidson’s original drawings, his numerous 
books and pamphlets, were bequeathed by him to the British 
Museum through his son William Davidson, Esq., February, 
1886. By his direction the entire collection of recent and fossil 
species are to be kept together in one series for the convenience 
of reference for all men of science who may wish to consult the 
same. 
The Stratigraph ical Collection occupies Wall-cases, Nos. 
1-4, along the western side of Gallery 11. A number of very 
fine specimens and slabs have been placed in these cases under 
their respective formations. The arrangement of these cases is 
still in progress. 
Wall-case No. 5 contains the group Cephalopoda, figured and 
described in the “ Mineral Conchology,” by James and J. 
de C. Sowerby, and forms part of the Sowerby Collection (see 
ante, p. 95). 
Wall-case, No. 6 (c). — This space is occupied by an interest- 
ing: series of rocks from various localities and horizons, all of 
which have been bored by recent Molluscs such as Pholas, 
Saxicava, &c. 
Wall-caseNo. 7 is entirely devoted to a large collection of Tracks 
and Markings , which may have been produced either by Molluscs, 
Annelids, Crustacea, &c., and others by the agency of rain or 
waves, and the atmosphere. Some of the finest examples are 
known under the names of Harlania, Crossopodia, Arenicolites , 
Cruziana , &c., and were formerly considered to be organic 
remains (such as Sponges, Plants, &c.). 
Wall-cases Nos. 8-10 are occupied by a fine series of Foot- 
prints and impressions mostly found in Sandstone of Triassic 
age. Attention is directed to the large slab from near Greenfield, 
Massachusetts, which is covered with impressions supposed to 
be the footmarks of birds or bipedal reptiles; these tracks are 
called “ Ichnites .” 
The Cheirotherium footprints in Wall-case No. 10 are exceed- 
ingly fine ; they occur chiefly in the Triassic Sandstones of 
Cheshire (see woodcut). 
