790 



ARTHROPODA 



PHYLUM VII 



and eight 



Arthrohjcosa Harger (Fig. 1520), and Profolycosa Roemer (Fig. 1521), are 

 Carboniferous examples, but tlie majority of forms are known from Oligocene amber 

 found on the shores of tlie Baltic in East Prussia. Mizalia Koch (Fig. 1522) is an 



Fig. 1520. 



Arthrnlycosa antlqxia Harger. Coal 'Measures : 

 Mazon Creek, Illinois, i/i (after Petrunkevitch). 



Fig. 1521. 



I'rofolycof:a aiitlira- 

 cophila Roemer. 

 Coal Measures; 

 Myslowitz, Sile.sia. 

 (after F. Roemer). 



Fig. 1522. 



Mizalia rostrata Koch and 

 Berendt. Oligocene ; Baltic 

 amber. 3/j. 



Fig. 1523. 



Attoides eresifonnis Brongt. 

 Oligocene ; Aix in Provence. 

 lo/i (after Brongniart). 



Fig. 1524. 



Thorn isus oeninijensis 

 Heer. Freshwater Mio- 

 cene ; Oeningen, Baden. 

 "/i (after Heer). 



example from the latter locality; Attoides Brongt. (Fig. 1523) occurs in the fresh- 

 water Oligocene marls of Aix in Provence, and Thomisus Walck. (Fig. 1524) in 

 similar deposits of Miocene age at Oeningen, Baden. The Upj)er Oligocene lignites 



of Rott, near Bonn, Ger- 

 many, and the Miocene fresh- 

 water strata of Florissant, 

 Colorado, have also yielded 

 remains of this order. Among 

 Eocene localities, from which 

 fossil Spiders have been ob- 

 tained, should be mentioned 

 the Green River beds of 

 Wyoming, and the strata at 

 Quesnel, British Columbia. 

 The known sj^ecies of fossil 

 Spiders aggregate about 250. 

 Tlie order Anthraco- 

 con fined to the 



FlO. 1525. 



Anthrai-oiHitrtiis I'oelkeUauus 

 Karsch. Coal Measures ; Neu- 

 rode, Silesia. Dorsal aspect, 

 i/i (after Karsch). 



Fig. 1526. 



respects intermediate l^etween them. 



Eoplirynvs pri'stvicii (Buokland). ynor+i ic 



Coal Measures ; Coalbrookdale, Bng- '^'^'- ^-^ 



land. Dorsal aspect, showing ten Palcozoic, and is IJerhapS 

 tergal segments of the hind- body. i. t i ji -d t i 



Vi (after Woodward). ' ancestral to tlie Pedipalps 



and Oi^iliones, being in some 



Its distinguishing characters are as follows : 



