CLASSIFICATION OF THE MYRIAPODA. 



BY CHAKLKS II. HOLLMA.N. 



In this paper I have given keys for the determination of all groups 

 above species. When a genus has been so inaccurately described that 

 it could not be introduced into the key without affecting the natural 

 order of genera, I have placed it. with its short diagnosis, as a foot- 

 note. 



On account of the great difference between the two principal orders 

 of the old group of Myriapoda, as has been recently shown by Poeock, 

 Ivingsley, and several continental writers, I have regarded the old 

 group as forming two distinct divisions: One. the Syngnatha, as being 

 more closely related to the Hexapoda, and should be united with it to 

 from one class j* the other, the .Diplofxnla and Puuroportti t ,as form- 

 ing another class, to which I have restricted the name of Myriapoda. 

 1 have regarded the Julifla' and their allies as being the oldest group 

 on account of the following facts: 



(1) That they are the only group of which we have any geological 

 evidence. 



(2) That they have more segments than other groups, thus showing 

 less specialization (the 3-footed condition of the young is due to the 

 amount of food-yolk and not to any ancestral form.) 



(3) That they have simple trachea-. 



The Myriapoda may be divided into the following subclasses: 



a. Antenna- simple, not ramose, 5-8 jointed; some or nearly all of the segments with 

 two pairs of legs; pairs of legs 13 or more ................... DITLOPOPA. A. 



an. Antenna 1 ramose, bearing 3 long, jointed appendages; none of the segments with 

 '2 pairs of legs; pairs of legs, II ............................. MoxoroDA.t B. 



This subclass contains the following two superorders: 



(t. Anns situatrd in ultimate segment: maxilla' forming a plate; body not orna- 

 meiiled with fascieiila- <>f hairs; copula tory feet present .. .(.'IIILOONA in A. I. 



aa. Anus -it uated in the penultimate segment ; maxilla 1 subpediform, not forming a 

 plate; body ornamented with faseicnla- of hairs; eopnlatory feet absent. 



\\ II.. 



For this class [ propose the name Khimtx-liiln (fri'imc, tntr; \i/.m, Up), on account 

 of the fact that it is the only group of Arthropoda which has a true Inhimn. The 

 Syngnatlia and Ilcxapoda are considered as subclassi v. 



t I have considered the r<tin-<>/><><1<( as being more closely allied to the Itifiln/milii on 

 account of the anterior position of the genital opening, the Conn and position of the 

 copnlatory appendix at base o f second pair of legs as in the l'nli/.i-iiiiil,i. and the 

 general make-np of the body. 



I MOM H'oi) A. I propose this new subclass for the reception of the l'niin>i>i>dn. 



VN I'oDociui.A. I propose this new superorder for the reeepi ion of the I'nliijn iiidir. 

 1'ocock ranked this family as a snbelas-i, but I think its relations to the < 'liihx/natha 

 are Too close to admit of so high a rank. 



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