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II. The Material and its Treatment. 
For various reasons I have only examined one species of the 
Eurypauropodidæ ; originally it had been my intention to ornit the 
larnily, but later on I thought it better to study the single species 
of which material vvas to my disposal, in order to examine sorae 
essential points of its structure and lay down diagnoses of alf three 
families. Of Brachypauropodidæ I have investigated au adult spe- 
cimen belonging to a new species. But of the family Pauropodidæ 
I have examined twenty-three species, — several times more than 
hitherto known — and twenty-one of them are new to science. This 
ricli material originates essentially from three sources. Several years 
ago I have collected in Denmark numerous specimens, belonging to 
hve species, and in 1893 I captured in Southern Europe a small 
number of specimens, among which two species not discovered in 
Denmark. -In January 1900 Dr. Th. Mortensen collected in 
Siam (in the Island of Koh Chang) sixteen specimens, whicli 
turned out to belong to nine species, all very sharply separated 
rrom each other. Dr. F. Sil vestri kindly lent me a number of spe¬ 
cimens collected by himself in Italy and in various countries in 
South America; his material contained in all eight, species, six of 
which were unknown to me, and besides a very interesting speci- 
men of Brachyp aur opus ; at an earlier occasion he had sent a spe¬ 
cies of Eurypauropus to the Zoological Museum. — Finally Mr. 
C. Bor ner lent me some specimens captured at Marburg, and 
among them a new species has been discovered. I beg Dr. Sil- 
vestri and Mr. Borner to accept my sincere thanks for the aid. 
The Pauropoda are not easy to deal with. In a paper (on the 
Palpigradi ) published about two months ago 1 have set forth sorae 
remarks on the treatment of such small and thin-skinned animals. 
Supposing that the major part of Zoologists who in the future will 
study the Pauropoda, have not read my paper on the Palpigradi , 
I reprint liere the lines on the manipulations used by myself and 
found to be indispensable. I should advise to lay the animals „in 
glycerine diluted with water on an object-glass, and to introduce a 
