MR. W. K. PARKER OK THE STRUCTURE AND 
2 
Sclater, F.R.S., and H. M. Ward, 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 Tnsectivora 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. Bennett, of Sydney, and to Professor Moseley, I 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 “ Dasypodidse,” 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. ‘ Memoire sur le Basiotique.’ Bruxelles, 1883. 
2. ‘ Sur la Eossette Vermienne du Crime cles Mammiferes.’ Avec une planclie. Bruxelles, 
1884. (Contains Marsupials, Edentates (.Dasypus novemcinctus), Sloths, Orycteropus, 
Tatusia, Myrmecophaga.) Fig. 1, Halmaturus; fig. 2, Dasypus. 
3. ‘ Sur les os intermaxillaires.’ Bruxelles, 1883. 
4. ‘ Sur la Yaleur morphologique de 1’Articulation mandibulaire du cartilage de Meckel et des 
osselets de l’Ouie.’ Bruxelles, 1883. 
5. c Sur la Yaleur morphologique de la Trompe d’Eustache,’ &c. Bruxelles, 1884. (Important 
for Mammalian homologies.) 
* I have since received from Professor Treves an embryo of Gycloturus that has not yet been 
worked out. An account of its skull will be given as an Appendix to the present paper. 
