Morphology of the Myriopoda. 339 
which may be cailed the pectinella, gives the stipes a decided 
resemblance to that of the hexapodous maxilla. In the Chilo- 
poda, according to the figures and description of Meinert, 
there is a greater variation in the nature of the pectinella of 
the stipes. As we have observed in the protomala of Scolo- 
pendra and Lithobius, there are three or more stout teeth, with 
an inner series of spinulated slender processes ; but in several 
genera figured by Meinert, as Mesocanthus albus, Mein., 
Scolioplanes crassipes, Koch, Chetochelyne vesuciana, Newp., 
Geophilus sodalis, Bgs. and Mein., and Mecistocephalus punc- 
tifrons, Newp., the cutting edge is provided with spinose pro- 
cesses alone. 
For the second pair of mouth-appendages of the Myriopoda 
we propose the term deutomala, or second pair of jaws. ‘They 
form the so-called labium of Savigny and later authors. In 
the Chilognaths they have a superficial resemblance to the 
labium of winged insects; but the corresponding pair of 
appendages in Chilopoda are not only unlike the labium of 
Hexapoda, but entirely different in structure from the homo- 
logous parts in Chilognaths. The ‘labium” of Newport, or 
first maxille of Meinert, have been described and figured by 
those authors, to whose works the reader is referred. 
The following remarks apply to the homologues of these 
parts in the Chilognaths. While most authors designate this 
pair of appendages as the “jabium,” Meinert more correctly 
calls them the first maxillv, briefly, in the Latin abstract of 
his ‘ Danmark’s Chilognather’ *, in his diagnosis of the order 
describing them as ‘‘Stépites mavillares appendicibus instruct, 
detecti;”’ but in his description of Judus referring to them as 
“ Tamina labialis parva, stipites labiales modo partim se- 
jungens.”’ 
Meinert also describes what he designates as a third pair of 
mouth-parts or /abéwm, which is enclosed by the second pair, 
behind which is a triangular plate (damina labialis), which he 
regards as a sternal part corresponding to the mentum of 
insects. He then adds, ‘ In front of the labium in the Poly- 
desmidz are two short round styles (stil¢ linguales), which are 
toothed at the end.” He also speaks of the curved piece 
behind the lamina labialis, which he designates as the hypo- 
stoma (see our fig. 2). 
It should be observed that Savigny states that the labium 
(lévre inférieure) is in Ju/us composed of what he designates 
as the first and second maxillw, his second maxille being 
Meinert’s labsum. 
‘ 
* ¢ Naturbistorisk Tidsskrift,’ 3 R. 5 B. 
