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



Finally we must consider the specimen described 1 as 



Euphoberia woodwardi, Baldwin. (PI. IX, Fig. 4.) 



This example has been kindly lent to us by Mr. H. Howard, of 

 Rochdale, to whom it belongs. The dimensions are those given by 

 Baldwin. The specimen consists of an impression of the head and a 

 cast of some thirty-eight segments of the trunk. In all important 

 characters the structure of the tergites agrees with that of the two 

 preceding specimens. Part of a ramifying series of small fractures 

 of the dorsal surface, just behind the middle of the specimen, is 

 interpreted by Baldwin as a bifurcating spine. We can find no 

 support for this suggestion. The granulated surface of the tergites 

 is exhibited in some places. Owing to the decortication of the 

 dorsal surface, the spiracles, leg-bases, and duplicated pleurites are 

 again visible, and all these agree with the description already given 

 of the same features in the two preceding examples. 



As a result of the re-examination of the material before us, we 

 conclude that these millipedes can no longer be retained in that 

 systematic position to which they have been assigned, and as a step 

 in the right direction, we feel justified in establishing the following 

 genus for their reception : — 



Paljeosoma, gen. nov. 



Segments numerous (more than thirty-eight), trunk parallel- 

 sided, narrowing anteriorly and posteriorly, flattened dorsally with 

 lateral expansions, the dorsal surface furnished with a row of lateral 

 spines on either side, head approximately the same width as the 

 anterior body segments, sternites large, two pleura to each tergite ; 

 of the tergites the prozonites are short, hardly visible from the dorsal 

 surface, and the metazonites are large, about eight times as wide as 

 long, divided by a well-marked transverse groove into a smaller 

 anterior and a larger posterior portion, each lateral spine provided 

 with a tubercular base. 



Genotype : Palceosoma giganteum (Baldwin), char, emend. Brade- 

 Birks et Jackson. 



The two following species fall into this genus : — ■ 



1. Palceosoma giganteum (Baldwin), char, emend, infra. (Text- 

 fig. 1-2 ; PL IX, Fig. 1.) 



Sxn. : Acantherpestea giganteus, Baldwin, Geol. Mag., 1911, p. 76. 



Length of the last seven segments, 45 mm. ; breadth of parallel-sided 

 segments, including lateral expansions, 44 mm.; head unknown, prozonites 

 smooth, metazonites only slightly convex from side to side, finely granulated, 

 divided by the transverse groove into an anterior third and a posterior two- 

 thirds, the groove deep near the median line, becoming shallow laterally, to 

 disappear before reaching the lateral borders ; lateral expansions prominent, 

 externally foliaceous, and backwardly directed ; the spine-base situated the 

 width of the metazonite from its lateral border and equidistant from its 

 anterior and posterior limits (except towards the posterior end of the body 

 (8 segments), where the spines appear to be nearer the posterior border) ; anal 

 segment small, the posterior end of the body obtuse. 



Type : L 9941 and L 9942, Man. Mus. 



1 Baldwin, op. cit., 1911, p. 78, PI. IV, Fig. 2. 



