182 SIR JOHN LUBBOCK ON PAUROPUS. 



other known Centipedes, among which it must certainly constitute a new family, 

 Pauropodidae, and, I think, even a new order, which might perhaps be called Pauropoda. 

 I will now proceed to describe this curious form. 



Pauropus Huxleyi, n. sp. Corpus e segmentis decern, setis sparsis. Pedum paria 9. 



Antenna? 5-articulatae, bifidse, appendicibus tribus, longis, multiarticulatis. 



Body composed of ten segments, including the head ; convex, with scattered hairs. 

 Nine pairs of legs. Antennae five-jointed, bifid at the extremity, and bearing three long, 

 jointed appendages. 



The body consists of ten segments, the first two of which compose the head. In form 

 it is slightly conical, each of the first eight segments being somewhat broader as well as 

 longer than that which precedes it. The two caudal segments, again, are somewhat 

 smaller than the antepenultimate. There are only nine pairs of legs, and their distri- 

 bution is peculiar. The third segment, or that immediately following the head, bears one 

 pair, while the fourth, fifth, sixth, and seventh segments have two pairs each. These 

 segments, however, may be regarded as double. The posterior legs are the longest. Each 

 segment, from the third to the seventh inclusive, has on the side margins of the back a pair 

 of strong bristles. The pair attached to the third segment (Plate X. fig. 1) point forwards, 

 those of the fourth are at right angles to the body, and the posterior ones point back- 

 wards. Besides these long bristles, the body bears on each of the larger segments two 

 transverse rows of short, stiff, club-shaped hairs, which are most numerous on the head. 



The body is quite white and colourless, but towards the head and tail it has some- 

 times a slight tinge of yellow. 



Length -^ of an inch. 



Pauropus Huxleyi is a bustling, active, neat, and cleanly little creature. It has, too, a 

 look of cheerful intelligence, which forms a great contrast to the dull stupidity of the 

 Diplopods, or the melancholy ferocity of most Chilopods 



It 



It lives throughout the year, among dead leaves and other decaying vegetable matter, 

 is active in its habits, continually running about, and sometimes giving a rush of 



» ATijLi © 



surprising velocity. Throughout the winter I found it on the warmer days. It 

 often cleans its feet and antennae with its mouth. In the latter case the antenna? are 

 held to the mouth by the front legs, a habit which may possibly be an indication that 

 this pair of legs is homologous with the jaw-feet of Chilopods *. The head is composed 

 of two segments, which have received the names of cephalic and basilar (See Newport, 

 Lmn. Trans, vol. xix. ). Seen from below they are nearly equal in size ; but from above the 

 posterior edge only of the basilar segment is visible, the rest being covered by the ce- 

 phalic. In the same manner, when seen from below, the separate segments to which the 

 legs are attached are plainly visible ; the last segment also is evidently treble. Thus 

 there are indications of fourteen segments. 



On the upperside of the head are two oval figures, which I pre sume to be eyes 

 (Plate X. fig. 3). They are, however, very unlike those of other Centipedes, and show 

 ™ trace whatever of facets. On the head are a number of short, club-shaped, ringed 



* In Lithobius, however, these are attached to the basilar segment of the head. 



