ARC. — TRI.] 



MYRIOPODA. 



573 



ward, but decreasing in length ; limbs 

 tapering, posterior pair as long as the 

 thorax, and larger and stronger than 

 those in front ; abdomen of eleven vis- 

 ible seg- , 



ments, those .. •-, y ^V^T^Ti 



the . » i I : » r ! . ' J 



rows on the back, spines spinuliferous; 

 ventral half of the segments each bears 

 a pair of small slender-jointed legs. 

 Type E. armigera. 



at the 

 terior 

 wi der 

 those of 



Fig. 1069. — Archiulus 

 xylobioides. A n t e- 

 rior part enlarged. 



middle long- 

 er ; basal seg- 

 ment has an 



oblong scar near the posterior edge; 

 crust chitonous. Type A. corneus. 

 corneus, Matthew, 1888, Trans. Roy. Soc. 

 Can., p. 59, Devonian. 



Archiulus, Scudder, 

 1868, Mem. Bost. 

 Soc. Nat. Hist., 

 vol. 2, p. 231, and 

 Acad. Geol., p. 

 496. [Ety.or- 

 chaios, ancient ; 

 ioulos, wood-louse.] 

 Segments entire, 

 varying much in 

 relative proportions, but generally from 

 two to three times broader than long, 

 furnished with only a few papillae, per- 

 haps supporting spiny hairs. Type A. 

 xylobioides. 

 xvlobioides, Scudder, 1868, Mem. Bost. 

 *Soc. Nat. Hist., vol. 2, p. 236, and Acad. 

 Geol., p. 496, Coal Meas. 

 Eileticus, Scudder, Mem. Bost. Soc. Nat. 

 Hist. [Ety. eiletikos, rolling one's self.] 

 No spines, but large, low tubercles, se- 

 rially arranged ; segments few, less 

 than twice as broad as long. Type E. 

 anthracinus. 

 anthracinus, Scudder, Mem. Bost. Soc. 

 Nat. Hist., Coal Meas. 

 Euphoberia, Meek & Worthen, 1868, Am. 

 Jour. Sci. and Arts, 2d ser., vol. 46, p. 

 26. [Ety. eu, very ; phoberos, formi- 

 dable.] Head semicircular ; body long, 

 slender, very slightly tapering, and 

 terminating abruptly ; segments sev- 

 enty-five or more on the ventral side 



Fig. 1071.— Euphoberia armigera. Entire specimen. 



anguilla, Scudder, 1880, Mem. Bost. Soc. 



Nat. Hist., vol. 3, p. 177, Coal Meas. 

 armigera, Meek & Worthen, 1868, Am. 



Jour. Sci. and Arts, 2d ser., vol. 46, p. 



26, and Geo. Sur. 111., vol. 3, p. 556, 



Coal Meas. 



Fia. 1070.— Euphoberia armigera. Part of a large 

 specimen. 



and half as many on the dorsal ; dorsal 

 half of the segments rounded, and each 

 supporting three or four spiaes, curved 

 slightly backward, and arranged in 



Fig. 1072. — Euphoberia armigera. A, part of an 

 individual ; B, enlarged surface pitting. 



carri, Scudder, 1880, Mem. Bost. Soc. Nat. 

 Hist., vol. 3, p. 171, Coal Meas. 



flabellata, Scudder, 1880, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 174, Coal Meas. 



granosa, Scudder, 1880, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 168, Coal Meas. 



horrida, Scudder, 1880, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 158, Coal Meas. 



major, see Acantherpestes major. 

 PaluEOCampa, Meek & Worthen, 1865, Proc. 

 Acad. Nat. # Sci. Phil., p. 52. [Ety. 

 palaios, ancient; kampe, a caterpillar.] 

 Head small; segments ten, similar, sub- 

 equal, and each bearing a pair of stout 

 clumsy legs, and four bunches of cylin- 

 drical needles or spines ; bunches seated 

 on mammillae, and arranged in dorso- 

 pleural and lateral rows, needles or 

 spines, exceedingly slender, scarcely ta- 

 pering, blunt at tip, and longitudinally 

 serrated. Type P. anthrax. 



anthrax, Meek & Worthen, 1865, Proc. 

 Acad. Nat. Sci. Phil., p. 52, and Geo. 

 Sur. 111., vol. 2, p. 410, Coal Meas. 

 Trichiulus, Scudder, 1884, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 290. [Ety. trichos, 

 hair ; ioulos, wood-louse.] Segments en- 

 tire, from three to five times broader 

 than long, closely covered with pa- 

 pillae, arranged in definite series longi- 

 tudinally, and transversely supporting 

 long, sweeping hairs. Type T. villosus. 



ammonitiformis, Scudder, 1884, Mem. 

 Bost. Soc. Nat. Hist., vol. 3, p. 292, Coal 

 Meas. 



nodulosus, Scudder, 1884, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 292, Coal Meas. 



