526 



s. isiiii : 



usually of seven joints, of which the distal three are very minute and 

 bead-like. In the male taken from the female specimen B, I have 

 observed that the right second antenna was made up of eight joints 

 of which four were bead-like, while the left side one exhibited only 

 seven joints as usual, a fact which stands in accord with what 

 Thielemann 1 ^ has stated for Isopods generally to the effect that even 

 in one and the same individual the antennae of both sides are mostly 

 somewhat, often strongly, assymmetrically developed. Lengths of right 

 side antennae of the male just referred to are: first antenna o,n8mm. 

 and second antenna 0,272 mm. (both exclusive of hairs). The basal 

 joint of second antennae is without hairs, the second shows one or two 

 short hairs near its antero-distal end ; other joints of that antenna, as 

 also all the joints of the first, are provided with a variable number of 

 short hairs at their disal end. 



The mouth parts project under the base of antennae as a prominent 

 conical process, at the tip of which the styliform ends of mandibles 

 may be seen. The free end of the mandible seems to become corni- 

 fied, and is of a brownish colour. It is pointed and very slender, 

 having a thickness of only 3/* near tip. 



The mesosome is distinctly segmented, the segments being separated 

 from one another by deep incisions in the lateral parts. There are seven 

 segments in all. These are of much the same appearance, except in the 

 fact that those nearer to both the cephalon and the metasome are 

 somewhat smaller than those in the middle. Measurements of mesosome 

 segments in the male taken from the female specimen B are as follows : 



Length. Width. 



ist or the foremost segment of mesosome, 0,164 mm. 0,692 mm. 



2nd segment of mesosome, 0,182 mm. 0,783 mm. 



3rd „ „ „ 0,237 mm. 0,837 mm. 



4th „ „ „ 0,218 mm. 0,855 mm. 



5th „ „ „ 0,218 mm. 0,801 mm. 



I) Thielemann, — "Beiträge zur Kenntniss der Isopodenfauna Ostasiens," p. 6, 19 10 



