<S'. //. S<;u<hler—Div»i'x'd<j <>/ T<ji» in <m< h nt ILiji-ittpoih. ]♦;."> 



anal stylets, while the first two pair are more profoundly trans- 

 formed to subsidiary mouth-parts, the first becoming palpi and 

 the second stout nippers. The head, really composed of eight 

 primitive segments, is apparently made up of two, each of 

 which is generally of about the same size as the body seg- 

 ments and as distinctly separated: the stout luting jaws! com- 

 posed of the second pair of legs, spring from this second seg- 

 ment of the head, and the palpi or first pair of legs from the 

 hinder part of the first cephalic segment : the anterior part of 

 the same bears the many-jointed simple antennae. 



Passing now to the comparative study of Palasocampa, we 

 had that it-: body \v;is in all pi !. composed 



of a limited number of segments behind the head, and the 

 head itself, considerably smaller than the body segments, is 

 composed of only a single apparent segment. The legs of the 

 segment immediately succeeding it are in every respect like 

 those of the rest of the body, and have nothing whatever to do 

 as auxiliary to the mouth. In this point alone we have a dis- 

 tinerii n as < de and inc sive is an \\\ ich separate the modern 

 and Chilopoda. In the body segments we discover 

 no trace of anything more than a simple ring without subdi- 

 vision, but as the specimens indicate a coriaceous structure like 

 that of modern Chilopoda, and no trace of the division between 

 the dorsal and ventral plates can be seen in any of them, the sep- 

 aration of the segments into two sub-segments, as in Chilopoda, 

 one of them greatly atrophied, could hardly be apparent did 

 it exist. But on the other hand, as we regard the second sub- 

 segment of Chilopoda as atrophied, we should expect to find it 

 fully or partially developed in these creatures, which of all 

 known ancient types are certainly the most closely related to 

 them. Yet we find here no sign of anything more than the 

 simplest possible, uniform, leg-bearing segments, and of a very 

 limited number. In one feature however, they are not so simple 

 as in Chilopoda: for. as stated, each is provided on each side 

 with two pais'.- of mammilla', supporting very large bunches of 

 spreading' rods, and the rods themselves sculptured in a very 

 way. This distinction between the two types, 

 though more striking and noticeable than any other, is in itself 

 by no means so important as the others, but may be added to 

 the catalogue ; and it must have some weight, from the total 

 absence of appendages of any sort (beyond scattered hairs) 

 from the dorsal plates of Chilopoda. The position of these 

 rows of fascicles and of the legs indicates that the ventral 

 plates were only a little narrower than the dorsal, and probably 

 of about the same extent as in the Arch i poly pod a; in this 

 respect they would not differ to any important degree from 

 modern Chilopoda. The legs were different in form, but their 



