524 Mr. R. 1. Pocock on the Morphology and 
from the type found in that genus. In the struciure of the 
second appendage a stage of specialization intermediate 
between those of Julus and Paraiulus is seen; but in the 
extraordinary modification of the limbs of the seventh pair 
and their adjacent sternal area, which results in the complete 
annexation of these structures by the copulatory apparatus, 
Mongoliulus stands alone, so far as I know, in the Chilo- 
gnatha. As opposed to this specialized feature is the primi- 
tive characteristic presented by the freedom of the sternal 
Fig. IL 
1. Mongoliulus coreanus, Poc., $. Portion of anterior extremity from 
the side, showing appendages of first and second pairs (app. I. 
and 11.) and penis (p.) i situ. 
la. Ditto. Appendages and sternum of first pair. 
16. Ditto. Appendages and sterna of sixth and seventh pairs, the left 
appendage of the sixth pair removed. st. vi. and app. V1. 
sternum and appendage of sixth pair; app. vi1., dwarfed ap- 
pendage of seventh pair ; st. vir., sternum of seventh appendages, 
with hairy blade-like processes. 
le. Ditto. Appendages of eighth pair (coleopods). 
1d. Ditto. Appendages of ninth pair (phallopods). 
elements of the anterior nine pairs of appendages. Tio sum 
up: the male of Mongoliulus is an advance upon the male of 
Paraiulus in the structure of the first leg and the almost 
total suppression of the seventh pair correlated with the 
modification of the adjacent sternal plate, and stands at a 
