2 MR. W. K. PARKER ON THE STRUCTURE AND 
Scuater, F.R.S., and H. M. Warp, Esq. (who lost no opportunity during his Botanical 
work in Ceylon of procuring valuable specimens for Professor HuxLEy and me). 
The order in which these materials are worked depends upon their fulness in any 
particular group; the Edentata are worked out, and the Insectivora are almost 
finished; then will come the Marsupials; this is not the ‘ order of Nature,” but 
of “necessity ;” and those who are interested in these matters must classify the data, 
when they have been collected. 
Nevertheless, I shall aim at bringing the Monotremata forward as soon as possible ; 
thanks to Dr. Bennert, of Sydney, and to Professor MosELry, IT am able to begin at 
the Ornithorhynchus and the Echidna. But my hopes, in that quarter, largely rest 
upon the results to be obtained by those whom the liberality of the Royal Society 
has put into a position for finding such treasures as the early stages of those archaic 
forms of Mammalia. ; 
As to the “ Order” now under consideration, the Edentata, I have worked out the 
skull in one or more embryos, as well as young, in all but the Anteaters;* happily, of 
that type I have the young in a very instructive stage. 
My richest materials are in the family “ Dasypodide,” or Armadillos. With this 
type I shall begin; it is perhaps, on the whole, the best, as it is not so intensely 
specialised as the rest, and thus is fittest for comparison with the Insectivora; the 
forms that are found on the highway of Mammalian life, and not in a bye-path, like 
the Edentata. 
The Insectivora will be described in my next, or third, part. 
BIBLIOGRAPHY. 
a. On the Zoology, Embryology, and Morphology of the Edentata, and of the 
Mammalia, generally. 
ALBRECHT, P. 
1. ‘Mémoire sur le Basiotique.” Bruxelles, 1883. 
2. ‘Sur la Fossette Vermienne du Crane des Mammiferes. Avec une planche. Bruxelles, 
1884. (Contains Marsupials, Edentates (Dasypus novemeinctus), Sloths, Orycteropus, 
Tatusia, Myrmecophaga.) Fig, 1, Halmaturus; fig. 2, Dasypus. 
. ‘Sur les os intermaxillaires. Bruxelles, 1885. 
He 29 
‘Sur la Valeur morphologique de l’Articulation mandibulaire du cartilage de MECKEL et des 
osselets de Ouie.’ Bruxelles, 1883. 
5. ‘Sur la Valeur morphologique de la Trompe d’Eustache,’ &c. Bruxelles, 1884. (Important 
for Mammahan homologies.) 
* I have since received from Professor TrEyes an embryo of Cycloturus that has not yet been 
worked out. An account of its skull will be given as an Appendix to the present paper. 
