408 J. W. Jackson, etc. — Notes on Myriopoda. 



bases of the walking legs, while two underlying ridges of material 

 representing the pleural and sternal plates are exhibited in several 

 cases. These ridges begin at points close to the median line of the 

 dorsal surface of the body, and run obliquely forwards and outwards 

 from the anterior and posterior borders respectively of the posterior 

 more elevated two-thirds of the metazonite. Thus the anterior of 

 the two ridges passes beneath the anterior portion of the metazonite, 

 while the posterior ridge lies entirely underneath the posterior two- 

 thirds of the metazonite. It is not improbable that these ridges are 

 parts of the ventral plates brought into this position by pressure. 



SB-....,. 



Fig. 2. — A partial reconstruction of two typical posterior segments (5th and 

 6th from end) of Palceosoma giganteum (Baldwin sp.). SB, spine-bases; 

 other lettering as in Text-fig. 1. x 1. H. K. B.-B. del. 



Near the anterior end of the fossil the lateral expansions of several 

 of the segments are broken away on the left hand side of the body, 

 and five pairs of legs are represented by five grooves in the matrix. 

 There are clearly two pairs of legs to each typical tergite. On the 

 right hand side one of the legs is seen in oblique section at the 

 anterior end of the fossil, and by passing a bristle up the hollow 

 centre of this leg its position relative to the spiracle close by can be 

 determined beneath the decorticated dorsal surface. By a com- 

 parison of this arrangement with that of other segments, it is evident 

 that each leg is associated with a spiracle. 



The next specimen is recorded as : 



Euphoberia armigera, Meek & Worthen. (Text-fig. 3 ; 



PL IX, Fig. 2.) 



[No. L 9944, Man. Mus.] 



This example was discovered by the late Mr. "W. A. Parker. The 



dimensions are those given by Baldwin. 1 The impression alone 



is preserved in the Manchester Museum, and shows indications of 



about fourteen dorsal segments with some of the corresponding 



ventral parts of the body and a series of walking legs. Owing to 



the imbrication of the tergites, the prozonites are scarcely visible, 



and thus only the metazonites are to be clearly seen. Each of these 



is provided with a lateral expansion and is divided transversely by 



Baldwin, op. cit., 1911, p. 77, PI. V, Fig. 



