390 



MASANOSUKE TA K.ESITA : 



third annulets of the right antenna taken together. Unlike a normal 

 annulet, it is somewhat narrowed in the middle a;id swollen at both 

 ends, and is slightly bent mesially in the 

 distal parts. The third annulet is somewhat 

 flattened and is about as long as the fourth, 

 fifth and sixth annulets of the right antenna 

 taken together. Its proximal, somewhat en- 

 larged end is bent mesially ; the distal parts 

 are davate. Due to the curvature of this 

 and the preceeding annulet, the entire antenna 

 takes a direction bent to the right. The last 

 annulet is the largest, being as long as the 

 five successive annulets from the seventh of 



the ri"ht antenna taken togedier. It is some- 

 Fig l 



what flattened like the preceeding one, but 



shows no enlargement at the proximal end. There can be no doubt 

 of that being the last segment, since there exists no trace of injury at 

 the extreme tip. 



Among the papers regarding structural anomalies of myriapods, 

 we find a number of cases of polymery of the legs, such as those 

 described by SILVESTRI (1897), BRÖLMANN (1884), and LÉGER and 

 DUBOSQ (1903). A case of abnormality of the gonopod was described 

 by BröLMANN ( 1916). As to abnormality of antenna in the group, 

 the specimen here noted seems to be the first case put on record. 



It is difficult to decide in the specimen whether the abnormality 

 is due to regeneration or is congenital. It is true that in the myriapods 

 homomorphosis is commonly met with, not only in the legs, but also 

 in the anal appendages. New PORTS observed the same phenomenon 

 in his experiments with the antenna; of Juins. However, I am inclined 

 to think that the case described above is not one of regeneration, and 

 that on the ground that the first annulet or the basal joint of the ab- 

 normal antenna is larger than the corresponding annulet of the other 



