SIR JOHN LUBBOCK ON PAUROPUS. 



183 



The antennae (Plate X. fig. 7) are 5-jointed, and bifid at the extremity. The four 

 basal segments are simple and short, but increase slightly in length from the base. 

 The fourth segment bears at its extremity two brandies, eacli consisting of a single 



segment. One is slightly longer than the fourth segment, and rather thinner {a). The 

 other (b) is nearly twice as long, and half as broad; it bears at its extremity a very 

 curious appendage, consisting of an immense number of rings, the first and last of which 

 are larger than the others. The first branch [a) terminates in two similar bat some- 

 what shorter appendages. These curious appendages remind one very much of the toy- 

 snakes, which consist of a number of saucer-like appendages united by their middles. 

 Between them lies a small pear-shaped appendage (c). The fourth segment of the an- 

 tenna; bears also three hairs at its extremity, two on one side and one on the other. The 

 latter is much shorter than the other two. Each of the three basal segments supports a 

 pair of rod-like, almost clubbed hairs, which are divided by a number of lines, almost 

 like the curious ringed appendages. These ringed hairs are no doubt connected u ith 

 sensation. Between the two appendages of the branch a is a small rounded body. 



The animal, as already remarked, often cleans the terminal portion of the antenna? with 

 its mouth. In the structure of the mouth Pauropus appears not exactly to agree either 

 with the Chilopods or the Diplopods. I found two pairs of organs : the mandibles (Plate X. 

 fig. 4) are somewhat elongated, and have several teeth at the extremity; the other pair 

 of appendages (Plate X. fig. 5) are minute and conical. 



The legs are eighteen in number, twenty-two being the smallest number in any pre- 

 viously known Myriapod. They are simple, and increase in size from in front backwards, 

 the last pair being about twice as long as the first. Theanterior legs (Plate X, fig. 10) are 

 i\j of an inch in length, and consist of five segments, which, according to analogy with 

 other Myriapods, we may regard as coxa, femur, tibia, and two-jointed tarsus. * The 

 coxa is short, and has on its underside a curious, triangular, leaf-like appendage. The 

 femur is rather longer, and bears on its underside a somewhat similar leaf-shaped appen- 

 dage. The tibia is shorter than the femur, and about as broad as it is lorn?. The first se<-- 

 ment of the tarsus is about as long, but thinner than the femur ; it bears a stiff spine on its 

 anterior margin. The second tarsal segment is still longer, thinner, and slightly tapering. 

 There are indications of a division near the middle. 



The structure of the foot is not easy to make out. There seemed to me to be a pad, 

 a claw, and a very short tenent hair. 



. The second pair of legs (Plate X. fig. 11) are rather longer than the first, which thev 



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much resemble, with, however, one remarkable difference — namely, intercalation of a 

 new segment between the first and second tarsal joints. This raises the number of tarsal 

 segments to that usual among Myriapods. The new segment bears a short spine on its 

 anterior side. 



The posterior legs (Plate X. fig. 12), which are the longest, are ^ of an inch in 

 length. Curiously enough, they resemble the anterior legs in the number of their seg- 

 ments. They possess, however, the additional seta. The leaf-like hair on the femur is 

 brnched (Plate X. fig. 13). 



Between the second pair of legs are two appendages (Plate X. fig. 19), which are 



VOL. XXVI. 



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