J. W. Jackson, etc. — Notes on Myriopoda. 409 



a ridge (a groove in nat.) into two parts, approximately an anterior 

 third and a posterior two-thirds as in the previous specimen. The 

 metazonites are provided with a lateral row of spine-bases on either 

 side, occupying practically the same position as that of those found 

 in A. gigantem. Each tergite is subtended by two pleural plates on 

 either side of the body, and corresponding to each pair of pleurites is 

 a pair of slender legs. The sternites are ill-defined. 

 We next come to the specimen described as the type of 



Euphoberia robusta, Baldwin. (PI. IX, Fig. 3.) 

 [No. L 9943, Man. Mus.] 

 In this example, discovered and presented to the Manchester 

 Museum by the late Mr. W. A. Parker, some fifteen of the trunk- 

 segments next to the head are represented. Owing to imperfect 

 preservation practically nothing of the structure of the head can be 

 distinguished. What Baldwin (op. cit., 1911, pp. 77-8, PI. V, 

 Fig. 3a) takes to be the tail is really the head, and in reading 

 his measurements we must bear this in mind. The narrowest 

 segments are those nearest to the head. The prozonites are 



Fig. 3. — PalcBosoma robustum (Baldwin sp.) (L 9944, Man. Mus.). Two 

 typical segments. E, ridge; PI, pleurite ; W, external outline of walking- 

 leg (segmentation of the appendage not distinguishable) ; other lettering 

 as in Text-figs. 1 and 2. x 2. H. K. B.-B. del. 



hardly visible, being represented by a narrow depressed band in 

 front of some of the metazonites. Once again the metazonites 

 are provided with lateral expansions, and are divided by a transverse 

 groove into an anterior third and a posterior two-thirds. A row of 

 lateral spines is definitely indicated, the remains of the 6pine-ba6es 

 being situated about the width of the metazonite from each lateral 

 border, and equidistant from the anterior and posterior limits of the 

 metazonite. As in a specimen we have already mentioned (L 9941), 

 the dorsal surface is considerably decorticated, and the fossil exhibits 

 some of the more ventral features of the body. Thus, in five 

 segments taken as an example, the underlying parts that are visible 

 consist of ten equal ventral rings slightly displaced along the median 

 line owing to crushing. These rings may be interpreted as the 

 impressions of the underlying pleurites with the possible addition of 

 the median sternites lying between the widely separated legs, the 

 position of the bases of the legs being indicated by their hollow casts 

 nearer the middle line, yet closely adjacent to the transverse ovate 

 spiracles, which agree in structure with those of the first specimen 

 described in this paper. 



