470 ONISCHLE. 



with a strong curved bristle, acute at the tip. The inner 

 maxillae are very delicate, and almost membranous, 

 oblique at the tip, with two curved setose bristles, the 

 base armed with two remarkable muscles. The outer 

 maxillae are narrowly oblong and rather curved, setose 

 at the outer margin, and spinose at the tip ; the foot-jaws 

 are oblong, rounded on the outside, the external base 

 armed with a strong triangular lobe ; the apex is divided 

 into two parts, the inner of which terminates in several 

 small teeth, and the outer in a movable finger-like lobe, 

 articulated at its base. 



The legs are all cursorial, and are terminated by a foot 

 having a small tooth on the inside. 



The branchial appendages on the underside of the 

 tail are arranged in pairs, the inner angle of the apical 

 margin being more or less extended backwards ; moreover, 

 in the males, the second pair of these appendages are 

 furnished at their base with a long style, dilated at its 

 base, pointed, and slightly curved at its tip. The ter- 

 minal pair of these limbs form the exserted biarticulated 

 appendages seen on either side of the acuminated ter- 

 minal joint of the tail ; the two divisions of the last 

 pair are nearly equal in length, the middle of the 

 outer division extending to the tip of the tail. The 

 internal accessory lobe of the basal portion is slender, 

 and extends rather beyond the tip of the last joint of 

 the tail. 



The general colour of this species is of a light greyish 

 brown or slaty lead, marked with blotches and spots of 

 yellowish white or buff, of which the most conspicuous 

 form a regular row on each side, parallel to the lateral 

 margins of the segments, the margins being also pale 

 with a dark spot ; the dorsal spots are less distinct : a 

 salmon-coloured variety, with dark patches, is stated by 



