MAMMALIA. 
I’. SEAL-EMBRYOS. 
REPORT ON A COLLECTION OF SEAL-EMBRYOS (LEPTONYCHOTES 
WEDDELLI) MADE DURING THE VOYAGE OF THE ‘DISCOVERY’ 
IN THE ANTARCTIC SEAS, 1901-1904. 
By H. W. Marerr Tims, M.A. (Cantab.), M.D. (Edin.), 
Professor of Biology, Royal Veterinary College, and of Zoology and Comparative 
Anatomy, Bedford College (University of London). 
(2 Plates.) 
INTRODUCTION. 
TuroucH the kindness of Professor Jeffrey Bell of the British Museum (Natural 
History) a collection of seal embryos was placed in my hands for examination. The 
collection was made during the voyage of the ‘ Discovery’ in the Antarctic polar seas 
during the years 1901 to 1904. The bulk of the material was fairly well preserved, 
though some was useless for histological purposes, while the larger specimens were so 
brittle that it was scarcely possible even to dissect them. This, coupled with the fact 
that the collection is rather deficient in early embryos, rendered it impossible to trace 
out in detail the embryological history of these interesting animals. I have therefore 
contented myself with giving a general account of the material, and of what appeared 
to me to be the more salient points of interest, more particularly those connected with 
structural adaptive modifications, or such as may have some bearing upon the phylogeny 
of the sub-order. 
The embryos are all labelled as those of Weddell’s Seal (Leptonychotes weddellt). 
The material is the more interesting since a similar collection was obtained during the 
voyage of the ‘8. Y. Belgica’ in 1897-1899. The latter has been placed in the hands 
of several investigators, and some of their results have now been published. 
The Antarctic Phocide are represented by five genera, Stenorrhynchus, Macrorhinus, 
Lobodon, Ommatophoca and Leptonychotes* (syn.: Leptonyx, Pecilophoca), of which 
the three last mentioned only are to be found within the Antarctic circle. 
Dr. Wilson (18) describes Weddell’s Seal as being the most handsome of them 
all, having a “coat richly marked with black and grey and silvery white; the upper 
parts are the darkest, but below these shades are blended in a most striking manner.” 
The adult animal measures 9 to 10 feet in length and has a girth of 6 to 7 feet. 
* The generic name, Leptonychotes, is now generally employed, since Sir William Turner pointed out that 
the name Leptonyx had been pre-occupied, having been given to other vertebrates as well as to a gastropod 
mollusc: see this Report, vol. ii., p. 10. 
VOL, V. B 
