528 



S. ISHII : 



3. Larva. 



In the brood chamber of an adult female I have discovered a 

 number of larvœ in the Micronisctis-stage. Measurements of an 

 average sized larva : 



Total length of body, 0,280 mm. 



Length of cephalon, 0,068 mm. 



Breadth of cephalon, 0,160 mm. 



Length of mesosome, 0,128 mm. 



Breadth of mesosome, o, 1 56 mm. 



Length of metasome, 0,084 mm. 

 The cephalon is halfmoon-shaped. It exhibits on the dorsal 

 surface a number of variously sized brownish-black spots, arranged in 

 an irregular group near the posterior margin (Pl. VII Fig. 10). Similar 

 but smaller spots are also present on the mesosome. I could not 

 however find distinct eyes such as were figured by Sars 1;> for the 

 embryo of Phryxus abdominalis (Kröyer) and for Microniscits. The 

 first antenna is short and is usually antero-laterally directed. It 

 consists of three joints and has a length of 0,024 mm - excepting the 

 hairs. The second antenna is longer than the first, having a length 

 of 0,280 mm. ; it is usually posteriorly directed. It is provided with a 

 long distal flagellimi and six short proximal joints, of which the two 

 distalmost are more slender than the rest. At base of flagellum, there 

 often exists a bristle of some length beset with a few minute spinous 

 processes on one side. In many specimens the fourth joint also shows 

 a long bristle at the distal end. The mouth is situated on a small 

 elevation between bases of antennas. It is guarded by two pairs of 

 appendages yet weakly developed. 



The mesosome is distinctly segmented, being composed of seven 

 similar segments. There are six pairs of legs. Each leg is composed 

 of five joints excepting coxal piece and is of a similar structure and 



I) loc. cit. Pl. 91 and 92. 



