572 



MYRIAPODA. 



[ACA — ARC. 



CLASS MYRIAPODA. 



The animals composing the Class Myriapoda are elongated, and composed of 

 numerous segments, all of which are substantially alike except the first and last. 

 The articulations of the body each bear one or two pairs of jointed legs. The com- 

 mon centipede and long-jointed worms, with numerous legs, found in damp places 

 and on trunks of trees, some of which coil up when alarmed, are examples. Only 

 a few Palaeozoic fossils are referred to this Class, and these belong to extinct 

 Orders. 



ORDER ARCHIPOLYPODA. 



Family ArchiulidjE. — Archiulus, Trichiulus, Xylobius. 



Family Euphoberid;e. — Acantherpestes, Amynilespes, Anthracerpes, Ei- 



leticus, Euphoberia. 

 Family Uncertain. — Archseoscolex. 



ORDER PROTOSYNGNATHA. 

 Family Pal.<eocampidjE. — Palseocampa. 



Acantherpestes, Meek & Worth en, 1868, 

 Geo. Sur. 111., vol. 3, p. 559. [Ety. 

 akantha, a spine ; erpestes, a creeper.] 

 Spines bifurcate at tip, and arranged in 

 dorsal, pleurodorsal, and lateral rows ; 

 segments three, or more than three 

 times as broad as long. Type A. 

 major, 

 major, Meek & Worthen, 1868. (Eu- 

 phoberia major,) Am. Jour. Sci. and 

 Arts, 2d. ser., vol. 46, p. 26, and 

 Geo. Sur. 111., vol. 3, p. 558, Coal 

 Meas. 



Fig. 1068.— Amynilespes 

 wortheni. 



Fig. 1067.— Acantherpestes major. Fragment, a, spine; 

 n, base of spine. 



Amynilespes, Scudder, 1885, in Zittel's 

 Handbuch der Pal., p. 729. [Ety. 

 amuno, to keep off; iluspaomai, to crawl.] 

 Spines simple, arranged in dorsolateral 



rows; segments four times as broad as 

 long. Type A. wortheni. 

 wortheni, 

 Scudder, 

 1885, in Zit- 

 tel's Hand- 

 buch der 

 Pal., vol. 2, 

 p. 729, Coal 

 Meas. 

 A ntiiracerpes, 

 Meek & 

 Worthen, 1865, Proc. Acad. Nat. Sci. 

 Phil., p. 51. [Ety. anthrax, coal ; 

 erpo, to creep, in allusion to its car- 

 boniferous age and probable hab- 

 its.] Founded upon an articulated 

 body of nineteen segments and 

 part of another. The last seg- 

 ment terminates in three or four 

 short, slender, hair-like or spine- 

 like appendages. Below the mid- 

 dle of each segment there is a 

 small prominence, marking the 

 spiracles, or breathing apertures, 

 which pertain to the Myriapoda. 

 Type A. typus. 

 typus, Meek & Worthen, 1865, Proc. 

 Acad. Nat. Sci. Phil., p. 51, and 

 Geo. Sur. 111., vol. 2, p. 409, Coal 

 Meas. 

 ARCiiiEoscoLEx, Matthew, 1888, Trans. 

 Roy. Soc. Can., p. 59. [Ety. archaios, 

 ancient; skolex, worm.] Cylindrical, 

 tapering behind the middle, and also 

 at the three anterior segments ; head 

 small, somewhat conical ; thorax of 

 three joints, increasing in width back- 



