OF THE OEDEE ASCOTHOEACICA. 163 



equal to the second, or rather longer, and smooth ; the second joint is bent at an angle 

 with the first, and has at the base behind a bunch of small cilia, the front is smooth. The 

 third joint is triangular, wider m front than behind, with a bunch of delicate cilia on the 

 proximal half of the front margin. The fourth joint is narrowly triangular, the greatest 

 width is behind ; in front it is projected into a small lobe which is furnished with two 

 strong produced spines, the front margins of which are serrated; beyond these large 

 spines are two or three small denticulate processes : this peculiar formation of the 

 fourth joint seems to suit it for uniting with the terminal claw to form a strong 

 grasping-organ. The fifth joint is longer than the combined length of the front margins 

 of the two preceding joints ; it tapers gently from the base to the extremity and is 

 fringed throughout the front margin with very large and finely plumose setae. The 

 sixth joint is subequal in length to the preceding : from near the base of the hind 

 margin there is projected a lobe which is more than equal in length to the breadth of 

 the joint ; at its base this lobe gives out a little process which carries a long and peculiar 

 seta and terminates in three long setae. Moreover, near the distal extremity of the 

 same margin of the joint another articulated lobe is seen, which terminates in three 

 setae. Beyond this on the side of the joint spring three small setae. The limb ends in 

 a strongly curved claw denticulated on its inner edge and furnished with a small seta on 

 its side. 



The mouth-organs are enclosed in a very large pear-shaped sheath much constricted 

 at the base (PI. 33. fig. 2 and PI. 34. figs. 1 & 2), and thence swelling out and then 

 narrowing to the extremity ; this sheath bears a bundle of down-like cilia at half its 

 length, and the extremity is drawn out to a spine-like point bordered with a few minute 

 cilia (PI. 34. fig. 2). Within this sheath are a remarkable series of organs, the structure 

 and arrangement of w r hich will be better understood from study of the illustrations 

 given than from any verbal description ; one of the outer pair of mouth-organs is repre- 

 sented in fig. 3. The next pair are shorter and may be seen in fig. 4. The beautiful 

 and complicated structure of the third pair is seen in fig. 5, while the split teeth of its 

 margin are shown in the more enlarged drawing fig. 6. The central organ with its 

 powerful and acute termination and saw-like edge behind is represented in fig. 7. It 

 would appear that there is only one of this central organ, while the other organs are in 

 pairs. 



The six pairs of feet are all composed of a two-jointed peduncle and two branches. 

 The outer branch in all cases is composed of two joints ; the inner branch of the first 

 and of the sixth pairs is two-jointed, while that branch in the second, third, fourth, 

 and fifth pairs is three-jointed. The first pair (PI. 35. fig. 1) has the basal joint of the 

 peduncle without sette, the second joint carries three setae on the distal portion of the 

 inner face. The inner branch consists of two joints of subequal length, of which 

 the first carries about five setae on the inner side and the second joint has three terminal 

 setae ; the outer branch has the first joint as long as the whole of the inner branch and 

 is devoid of setae, the second joint is equal in length to two-thirds of the first and 

 terminates in a dense bunch of setae. The second feet (PI. 35. fig. 2) have the peduncle 



