42 T. THORELL, 
the accompanying diagram, which gives a view of the connexion founded 
on real affinity which the families of the spiders adopted by us, accor- 
ding to our opinion, have with each other 1). That connexion is more ea- 
sily shown in a plane than in a series, but of course ever that method of 
representation still leaves much to be desired. Thus e. g. the line (13) 
that marks the Thomisoide ought to be supposed drawn in another plane, 
so that the distance between the Theraphosoidæ (10) and the Zycosoide (14) 
may not be greater than between the first of these and the Thomisoidæ (13). 
We first divide the order of spiders (ARANEÆ) into 7 swb-orders: 
I. Orbitelarie, II. Retitelarie, III. Tubitelarie, IV. Territelarie, V. Citi- 
grade, VI. Laterigrade, and VI. Saltigrade, corresponding to the old, 
almost similarly named Latreillian families (Retitelarie NOB. = Inequitele 
Later.) 2). These subdivisions moreover fall asunder into the 22 families 
inserted in the figure. If we begin with the Tubitelariæ as the lowest sub- 
order, we might also consider the others as radiating from it in three prin- 
cipal branches, whereof one is composed of the Zetitelarie and Orbitelarie, 
another of the Territelarie, the third of the Zaterigrade, Citigrade and 
Saltigrade: the 16 families represented in the European fauna would per- 
haps then be most accurately conjoined in the following manner: 
16. Attoide. 
1. Epeiroide. 115. Eresoide. 
12. Theridioide. ]14. Oxyopoide. 
13. Scytodoide. 113. Lycosoide, 
4. Enyoide. 112. Thomisoide. 
5. Urocteoide. 
6. Hersilioide. 
Y. Agalenoide. |, 
Drassoide. 
© go 
. Dysderoide. 
0. Filistatoide. | 
| 
l 
| 
1. Theraphosoide. 
1) I believe with Darwin, "that propinquity of descent — the only known cause 
of the similarity of organic beings — is the bond, hidden as it is by various degrees 
of modification, which is partially revealed to us by our classifications’ (On the 
Origin of Species, 4th Ed., p. 489). 
2) The old division of the spiders into two great coordinate groups, Theraphoses 
and Araignées: WALCK. (Mygalées and Aranées: DUGHS), or Quadripulmonaires and 
