Dr. R. Woodward — Myriapods of the Coal Period. 7 



In one instance (PL I. Fig. 1) the head is associated with seven 

 consecutive well-preserved somites or body-segments ; in another 

 instance with five segments ; the other two examples have portions 

 of segments only in association with the head, but of their identity 

 I feel no doubt on comparison with the others. 



The head is somewhat rounded in outline, the sides being com- 

 pressed and the posterior border slightly incurved. The anterior 

 portion of the head, which is tumid, is without divisions, and is not 

 ornamented save for a minute granulation common to the general 

 surface. The posterior half has a clear straight groove down the 

 centre, and on either side is marked by two lateral curved grooves 

 which subdivide the back of the head into four tumid lobes ; the two 

 subcentral ones are the largest and are arched in front so that they 

 overlap the two outer lobes which lie within their lateral concavities. 



At each antero-lateral angle of the two subcentral lobes tbere is 

 a small rounded prominence marked by a corresponding circular pit 

 on the inside of the head. These are no doubt the points of articu- 

 lation for a pair of simple antenna, and they are placed just in front of 

 the compound eyes. These occupy the two small elevated lobes at the 

 latero-posterior angles of the head, and are in almost similar relative 

 position as in the head of the modern Julus. There are about ten 

 rows of facets in each eye (Plate I. Fig. 3 o), and seven or eight facets 

 in each row ; the smallest facets being those nearest the centre of the 

 head, and the largest towards the border. Behind the posterior 

 lobes of the head is a simple granulated margin, one millimetre 

 broad, running parallel with its posterior border. Breadth of head 

 14 mm., length 10 mm. 



In addition to a very well-preserved detached head twisted half 

 round, seen in Plate I. Fig. 1 (closely agreeing with that drawn on. 

 Plate I. Fig. 3), the same nodule retains the impression and counter- 

 part of seven body-segments united together exposing their dorsal 

 aspect. Each segment consists of a broad, raised, median ridge, 

 bearing two subcentral bases of spines, the spines themselves having 

 been broken ofi". They are, however, occasionally to be seen in 

 sections of somites, as at the end of Figs. 4 s, and in 2 s. 



This ridge extends to and unites with the lateral border, where it 

 gives origin to a large unequally branched spine, the longest ramus 

 of which measures 10 mm. (in PI. I. Fig. 1) ; at the antero-lateral 

 border of each somite there arises a simple pointed spine 4 to 5 mm. 

 long, directed forwards, and a very minute simple spine on the 

 postero-lateral border directed backwards. These larger spines were 

 at least 5 or 6 mm. long, if not more, and they are seen to be hollow. 

 They certainly varied slightly in character and in length in the same 

 individual, as did also the segments upon which they were borne, 

 according to their position in the animal's body. 



Occasionally, as in PI. I. Fig. 7 s, the ordinary forked marginal 

 spine is seen to be trifid ; but this I am persuaded is due to the single 

 simple spine, which is usually found at its base, occurring rather 

 higher up than usual, and is not a specific character. 



The hindmost segment preserved in Fig. 1 measures 15 mm. in 



