W. Baldwin — Fossil Myriopods from the Coal-measures. 79 



The surface appears smooth, but iu one or two places a delicate 

 granulation may be seen, and a few segments exhibit a feeble wrinkling 

 or faint corrugation of the surface. 



Where the surface has been worn away hollow coxal cavities are 

 exposed, and outside these are the large oblong ovate spiracles running 

 transversely to the body, with a thin laminate ridge along the middle 

 of each ; they are about 1 mm. long and 0*5 mm. broad. The 

 posterior end of the fragment exhibits portions of legs that indicate 

 they are slender as compared with the bulk of the creature. 



I have named this very interesting Myriopod after Dr. Henry 

 Woodward, to whom students of fossil Arthropoda are so much 

 indebted. 



Pani. 3. Asohiulidje, Scudder. 



Genus Xylohius (Dawson). 

 Xtlobids Platti (H. Woodward). 

 A fifth and very perfect Myriopod (see Text-figure) discovered by 

 Messrs. Suteliffe & Parker and recorded by Dr. Henry Woodward 

 at the British Association meeting, York, 1906, was named 

 Xylohius Platti by Woodward in honour of the local work done by 

 Mr. S. S. Piatt, F.G.S., of Rochdale. It has been presented to the 

 British Museum (Natural History), where it is registered [I. 13738]. 

 I now append a figure and a short description of this interesting 

 gally-worm. Length 50 mm. as it lies on the stone, or 54 mm. if 

 extended, semicircular form, body cylindrical, of nearly uniform 



Xylohius Platti, H. Woodw. MS. [Brit. Mus. I. 13738.] Middle Coal- 

 measures : Sparth, near Eochdale. x ^ nat. size. Drawn by Miss G. M. 

 Woodward. 



width throughout the principal part, but slightly tapering towards 

 either end. Consists of about forty-two segments. Breadth of body 

 3'b0-§'5 mm. The head and two posterior segments measure 

 2-4 mm. The segments are a little convex, averaging l - 5 mm. 

 in length per segment, their length to breadth as 1:4. Surface 

 nearly smooth, frustra only slightly preserved. Both anterior and 

 posterior borders slightly incrassated. Two pairs of legs to each 

 segment, but not well preserved. 



This species is nearly related to Xylohius mazonus of Scudder, from 

 the Coal-measures of Mazon Creek, Illinois, 1 but in the American 

 specimen the segments are more numerous, numbering as many as 

 fifty ; they are more parallel-sided, and their ornamentation of fine 



1 See S. H. Scudder, Mem. Boston Soc. Nat. Hist., vol. iv, No. 9, pp. 439-40, 

 pi. xxxvii, figs. 7-11; and K. Zittel, Hanclb. d. Palaeont., I, ii, p. 730, 

 fig. 902, 1885. 



