CLASSIFICATION OF THE MYRIAPODA. 



ItV (IIAIM.IS II. ItuI.I.MAN. 



Ill this i»iii>«M' I liavc ;;iv«'ii keys tor tin* dctoniiiiiiition of :ill <;i«)ii|»s 

 abdvo sprcics. WIkmi ii iiriiiis lias liocii so iiiarcmatrly «I«'S('iil>«'<l tliat 

 It could iHtt 1)0 iiitrodiicfd into tlir k«'y without atlfctiiiji' the natural 

 order of jieiiera, 1 have phut'd it. with its short iliayiiosis, as a foot- 

 nut**. 



On account of tin' j;reat ditVerencc between the two |)rincii)al orders 

 of the old ^iroiip of Myriapo«la, as has been recently shown by I'ococU, 

 Kinjisley, and several continental writers. I have reuar<led the old 

 jii'onp as forinin<:f two distinct divisions: One. the Synj;iiatha, as beinj; 

 more ilosely related to the ilexapoda, and should be united with it to 

 from om^ (dass;* the other, the I>ipl<tpo)hi and Pnuropodn + ^is form- 

 injj another class, to whi<d» I have restricted the name of ]\Iyriapoda. 

 1 have rej^arded the tJidltla' and Their allies as beinj^ the oldest uronp 

 on account of the followinji' facts: 



(1) That they are the only ^rouj* of which we have any fjeolojrical 

 evidence. 



(2) That they have niort^ se|i>ineuts than other jiioups, tiius showin<; 

 less specialization (tlu^ -J-footed condition of the younj; is due to the 

 amount of food y<dk and not to any ancestral form.) 



(3) That they have simple, tracheie. 



The Myriajioda may be divided into the foUowiii}^ subclasses: 



a. Aiitciin;!' siiii])!*', not ramose, .5->< .jciiiitt'd: soiiu' or ne;iily all of tlie se^^iut-iits will. 



two pairs of Ici^s; pairs of lej;a i;> or more |)!I'I.(»1'oi>a. — A. 



tia. Antfiiiin' laninsc. hearing 'A lon<f,.joiiit<-<l a|i]»<>ii«laj;<'s; none of the M-fjinrnts witji 



2 pairs of legs; ]>airs of l<'f;**> 9 MoN'oi'oDA.t — H. 



This subclass contains the following; two sui)erorders : 



«. Anns situated in nltimatc sejiincnt; inaxilla- forniinj; a plate; body not orna- 

 mented witii fascienla' of liaiis; cni) ilatoiy feet present., .('uiloonatiia. — I. 



aa. Auuasitnated in tlie ])enniriniate scj^-neat ; maxilla; Mn!)]»('(Uforin, not forming a 

 l>latt'; body ornamented with fascicnla- of hairs; copulatory feet absent. 



PoDOClULA.vX— II. 



* For this class I pro]>ose the name Etifmorhila (rrrini^, true; xiAor. lip), on aoonnt 

 of the fact that it is the only gronj) of Artiiroi)oda which has a trne labium. The 

 Syngnatha and Hexapoda are considered as snbclasst-s. 



t I have considered tiie I'din-npixhi as l»einn more closely allied to the IHplopoda on 

 acconnt of the anterioi' position of the genital opening, the tbrm and jiosition of the 

 <;((])nlatorv appendix at ba.se oi .seioud pair of legs as in the I'ohjxenid'.v, and the 

 general make-n)> of the body. 



t MoN'orODA. — I pro)>ose this new snlxlass for the rece])tion of the I'tutropixlu. 



v^ PoDOCHii.A. — 1 propose this new snperorder tor the reception of the Poli/xi niihit. 

 Pocock ranked this family as a snl)class, bnt I think its relations to the Chilofinatha 

 are too close to admit of so liigh a rank. • 



153 



