286 
MR. NEWPORT ON THE REPRODUCTION OF LOST PARTS 
It is thus proved that the legs and antennae of the Iulidee are reproduced at the 
change of skin. Since making these experiments, I have met with many instances 
in which these parts have been reproduced, as indicated by comparison with corre- 
sponding parts in the same animals. In no instance has the fact been better exem- 
plified in the Iulidae than in a specimen of Spirostreptus microsticticus *, Newp., from 
the coast of Africa, now in the cabinets of the British Museum, in which most of the 
legs on the left side of five segments of the body, from the thirty-ninth to the forty- 
third, have been reproduced, while the animal was living in its natural haunts. In most 
of these the entire limbs, including their basilar or coxal joints, have been restored, 
each limb being perfect in all its joints, even including the terminal claw, although 
not more than one-half the size of the corresponding limb on the opposite side of the 
same segment. From these facts, it appears that the reproduction of a lost part in 
the Iulidee may take place either in connexion with some portion of the original 
organ, or may be entirely independent of it, as when every portion of the original 
organ is removed. 
The reproduction of lost parts in the Chilopoda differs a little from that of the 
Chilognatha. Although I do not intend on the present occasion to give a detailed 
account of the changes and growth of animals of this order, I may state that the 
Lithobii differ a little from the Iulidse in the mode of development of their segments 
and legs. Like the Iulidse they change their tegument in the young state very fre- 
quently, and at each change, two pairs of legs, which have previously made their ap- 
pearance at the sides of the new segments as very minute projecting appendages, 
are elongated and assume the structure and function of legs. The young Lithobius 
very frequently loses some of its limbs, probably from being attacked by others of its 
carnivorous species, as frequently occurs when several of these are kept together in 
confinement. 
It was a specimen of Lithobius vulgaris , Newp. that had previously acquired its 
tenth pair of legs, but had very recently suffered the loss of the eighth, ninth, and 
tenth pairs of those organs, that formed the subject of this part of my investigations. 
At this period of its life the little animal is very delicate, but active, and endowed 
with all the ferocious habits of the adult. It was now scarcely more than one quarter 
of an inch in length. I had feared that at this early period the young Myriapod 
might not be able to support so much injury, and be able to reproduce so many pairs 
of lost organs. But it moved about with the remaining seven pairs of legs with its 
usual activity, as if in an uninjured state, and did not appear to be at all inconve- 
nienced by its loss ; but it carefully avoided coming in contact with others of its own 
species that were confined with it in the same phial. On this account I removed it 
to another phial, in order to watch its progress more accurately. Each of the legs 
that were lost had been removed at the articulation of the femur with the coxal joint, 
* List of the Specimens of Myriapoda in the Collection of the British Museum, by John - Edward Gray, 
printed by order of the Trustees, 1844, p. 14. 
