Systematics of certain Chilojnathous Diplopods. 523 
the fourth very long and stout, the fifth (representing the fifth 
and sixth in Paraiulus) shorter and thinner. Appendages 
of second pair (fig. II. 1, app. 1. and p.) dwarfed, but 
normal in form, armed with a long claw, and consisting 
of five free segments, of which the basal is the trochanter, 
the elongate coxe being fused together and with the sternum 
to constitute a vertical columnar sclerite which bears the 
penis on its posterior side. Anterior appendages of the sixth 
segment (=sixth appendage) normal, the posterior appendage 
(=seventh leg) reduced to an inconspicuous three-jointed 
conical bud rising from the side of the enlarged sternum and 
concealed by the infero-lateral edge of the sixth tergal plate ; 
sternal area of the appendage, perhaps containing the coxal 
element of the latter, produced into a pair of long, antero- 
posteriorly compressed, immovable, blade-like sclerites, 
fringed externally and internally with long hairs (fig. II. 14). 
Appendages of the seventh segment (eighth and ninth pairs of 
legs) formed upon the same plan as those of the majority of 
the North-American species of Paraiulus (fig. II. 1c, 1d). 
Segments 1-7 open below, the sterna not coalesced with the 
terga. 
2. Legs of the first and second pairs subequal in size, 
normal in form; no large sclerites developed in connexion 
with the generative orifices. Segments 1-4 open below, 
third leg not attached to the fourth segment ; inferior angles 
of first segment projecting inwards like those of the second. 
Type M. coreanus, Poc. 
The type species of this genus was assigned to the genus 
Paraiulus (Ann. & Mag. Nat. Hist. (6) xv. p. 365, pl. xi. 
fig. 12, 1895). It is represented in the British Museum by 
an adult female and two adult males. Certain specific 
features not mentioned in the original description are shown 
in the annexed figures (p. 524). 
This very remarkable genus presents a complex of characters 
distinguishing it from all its nearest allies. The female is 
nearer that of Julus than of Paraiulus, as is testified by the 
size of the second leg and the absence of genital plates. Its 
gnathochilarium is like that of Paraiulus. It differs from 
both in the freedom of the sternum of the third leg, which in 
both Julus and Paraiulus is attached to the fourth tergal 
plate. The inward projection of the inferior angles of the 
first tergal plate is also characteristic. 
The male in the structure of the gnathochilarium and 
first leg recalls Paraiulus, though the suppression of one of 
the segments of the last-mentioned limb shows departure 
