Dr. H. Woodward — Myriapods of the Coal Period. 3 



Mr. S. H. Scudder, however/ has changed the name to X Wood- 

 wardii, on the ground that the marks which I interpreted as pro- 

 bably the openings of trachese, are in reality " the scars or bases of 

 spines, which appear as warts or tubercles in many of the Mazon 

 Creek Myriapods ; or, when viewed from the interior surface, as 

 pits" {op. cit. p. 149). 



In 1868, Messrs. Meek and Worthen ^ described several well- 

 preserved remains of spined Myriapods from the Ironstone nodules 

 of Mazon Creek, Illinois (see Woodcut, Fig. 3), which are placed by 

 Scudder in five genera and twelve species (see infra). 



In 1871, I figured another Myriapod from the Clay-ironstone of 

 the Coal-measures, Kilmaurs, Ayrshire, under the name of Euphoberia 

 Brownii.^ In that paper I compared E. Broionii, mihi, with E. armi- 

 gera, M. and W., and stated, " There are indications of pores, and 

 also of the bases of tubercles or spines, along the dorsal line, but 

 the latter are less perfectly preserved." 



In 1882, Mr. S. H. Scudder^ summarized our knowledge of the 

 Myriapoda of the Carboniferous formation, and added several new 

 species, in addition to proposing a classification for those already 

 described. 



Later on (1884 5), Scudder described three species of a new genus 

 of Myriapods (TricMulus), and gave a description of another 

 Myriapod which had first been noticed under the name of Palcso- 

 campa anthrax by Messrs. Meek and Worthen in 1866, and for which 

 he proposed, in 1884, a new suborder, viz. Protosyngnatha. 



This form of Myriapod is remarkable on account of the dorsal 

 plates supporting several longitudinal rows of fascicles of needle- 

 like spines, giving it the appearance of a hairy Caterpillar of the 

 " Tiger-moth" [Arctia caja).^ 



The body-segments have a single dorsal and ventral plate, the 

 latter bearing a pair of widely-separated, stout, fleshy legs, one pair 

 to each segment behind the head. These stout fleshy legs of Palceo- 

 campa remind one of the legs of Peripatus, but that genus has no 

 hard tergal covering to its segments, as was the case in the fossil form. 



All the other Palaeozoic Myriapods are included by Scudder in his 

 suborder Archipolypoda. 



These Myriapods have a more or less cylindrical body, the head is 

 slightly larger than the body-segments, being composed of probably 

 three or more coalesced segments, and bearing, as in other forms, 

 a single pair of antennse, a pair of compound eyes, mandibles, 

 maxillee and having the first pair of post-cephalic appendages directed 

 forward, probably to assist in the process of feeding. The dorsal 

 portion (tergum) of each somite or segment of the body is composed 



1 Mem. Boston Soc. Nat. Hist. 1882, vol. iii. no. v. p. 148. 



2 Amer. Journ. Sci. Arts, vol. xlvi. p. 2-5. See also Geol. Surv. Illinois, iii. 556. 



3 See Geol. Mag. Vol. VIII. p. 102, PI. III. Fig. 6 «, b, c. 



* Mem. Boston Soc. Nat. Hist. vol. iii. no. v. pp. 143-182, pi. x.-xiii. 



* Mem. Boston Soc. Nat. Uist. vol. iii. no. ix. 1884, " On two new and diverse 

 types of Carboniferous Myriapods," pp. 283-297, pi. xxvi. and xxvii. 



6 Scudder's TricMulus villosus was also covered with fine hairs ; but this sup- 

 posed Myriapod now proves to be the circinate vernation of a fern ! 



