150 TANAID^E. 



also composed of a considerable number of articuli. The 

 lower antennae are much shorter than the upper, the 

 basal joints being the thickest, the third furnished with a 

 small oval squamose plate at its extremity, the terminal 

 joints or flagellum slender, extending beyond the base 

 of the flagellum of the upper. The upper surface of 

 the head is uneven (the fissures probably marking the 

 point of fusion of the head \vith the first joint of the 

 body), terminating in front in a porrected point. The 

 eyes are affixed upon a pair of short, somewhat kidney- 

 shaped lobes. The outer foot-jaws are short, and ciliated 

 on the inner margin. The mandibles are elongated, 

 gradually narrowing to the tip, which is denticulated ; 

 they bear a slender, three-jointed appendage, the first 

 joint of which is very short, the second and third longer 

 and nearly equal in length, the latter furnished with long 

 bristles at the tip, set on at right-angles to the joint. 

 The first pair of legs are robust, the wrist is swollen, 

 and armed on its under side with two tubercles a short 

 distance apart ; the hand is large and oval, its inferior 

 angle produced into a finger, having a tubercle on its 

 inner edge near the middle, against which the true finger 

 impinges, the latter having a small tubercle on its inner 

 edge, close to its base. The second pair of legs have the 

 hand developed into a large, transversely flattened ovate 

 joint, having several strong spines on its margins, so as 

 to give it a digitated appearance, the terminal finger 

 resembling one of these spines. The third and fourth 

 pairs of legs are slender, having a forward direction, the 

 penultimate joint is very slender, except at the tip, which 

 is dilated and fringed with spinous hairs, the slender 

 terminal finger inserted on its posterior surface within 

 the tip. 



The fifth pair of legs are also slender, but with a back- 



