158 PACKARD—CLASSIFICATION OF ARTHROPODA.  [April3, 
In 1893 Pocock?! divided the tracheate Arthropods into two sec- 
tions, the Progoneata (including class Pauropoda and class Diplo- 
poda), and Ofisthogoneata, embracing the Homopoda (class Sym- 
phyla and class Chilopoda) and Hexopoda (class Hexopoda). 
Afterwards? he placed the Symphyla among the tracheate Progo- 
neata. 
This classification of Myriopoda was adopted by Schmidt in 
1895, and has been adopted by Verhoeff* and the term Myriopoda 
will probably hereafter be merely used as a convenient appellation 
for polypod tracheate arthropods. 
We would add that, rejecting the old term Tracheata, the proso- 
goneate Myriopods appear to us to constitute an independent 
phylum, rather than a subphylum, and for that reason we have ven- 
tured to propose the name Merofoda for the group (epog, a part 
or segment; zoug, zodos, a leg), from the fact that the mandibles 
are more distinctly divided into segments than in any other group 
of Arthropods, thus more closely resembling the other appendages 
of the body, whence it follows that all the limbs, including the 
mandibles, have the primitive feature of being composed of several . 
segments. 
The Symphyla in respect to the structure of the mandibles are 
less primitive than the Diplopods, but I am now inclined to agree 
with those who have pointed out their Diplopods affinities and to 
place them among the Meropods. . 
The Systematic Position of the Symphyla.—This is a puzzling 
problem. In my TZext-Book of Entomology I have with some 
care reviewed the chief points in the anatomy of Scolopendrella 
and the opinions of different authors regarding its systematic rela- 
tions. Having studied sections of the animals, I prepared a figure 
or reproduction from the sagittal sections of a female, of which the 
accompanying illustration (Fig. 1) is an enlarged reproduction. 
Comparing the digestive tract with that of Pauropus, it is divided 
into three portions ; the cesophageal valve opening into the stomach 
is seen at @. v., and the beginning of the rectum is well marked ; 
the two urinary tubes are large, arising at the posterior end of the 
intestine and ending in front at the third segment from the head 
1 Zoologische Anzeiger, xvi, Jahrg. 3, Juli, 1893, p. 271. 
2 Natural Science, x, February, 1897, p. 114. 
3 Bronn’s KZassen. u. ord. Thier-reichs, Bd. V, VI, Abth. Arthropoda, Leip- 
zig, 1902. - 
