Palaeozoic Arachnida of North America. 



61 



2. Cephalothorax oval 



+ cephalothorax anteriorly truncated 



G. carhonaria Sciidder. 



G. gigantea n. sp. 



-t=± 



Geralinura carbonari a Scudder. 

 Plate IV, figs. 21, 22 ; text figs. 19, 20. 



G. carhonaria Scudder, Proc. Amer. Acad. Arts Sci., Vol. XX, 1884, 

 p. 19. Id., Mem. Boston Soc. Nat. Hist., Vol. IV, 1890, p. 455, pi. 39, 

 fig. I. 



Scudder's description of this species is based on two specimens one 

 of which, specimen a, alone belongs to it and is therefore the type. 

 Specimen b is undoubtedly a 

 different species and forms the 

 type of G. similis n. sp. 



The type specimen was 

 originally labelled 1754 a and 

 b, but is at present in the 

 collection of the U. S. National 

 Museum under the number 

 37985. Both the obverse and 

 the reverse are well preserved. 

 The obverse shows the cephalo- 

 thorax, abdomen, and frag- 

 ments of pedipalpi and legs ; 

 the reverse the sternum with 

 coxae and femora, abdomen, 

 and five segments of the whip. 



The cephalothorax is oval, 

 4.03 mm. long ; its greatest 

 width is about 1/3 from poste- 

 rior edge and measures 3 . mm. 

 Eyes are absent. The ab- 

 domen is II. 8 mm. long, roun- 

 ded in front ; the total length 



of the specimen to base of tail, 16.0 mm. The anterior ten 

 segments of the abdomen are subequal in length and their tergites 

 are considerably narrower than the width of the abdomen. The 

 eleventh and twelfth segments are somewhat longer than the pre- 

 ceding ones and considerably narrower, but there is no abrupt diffe- 

 rence in size, the abdomen narrowing posteriorly, but gradually. 

 The five segments of the whip measure together 4.06 mm. The 



Fig. 20. 



Figure ig.— Geralinura 



carhonaria Scudder, ho- 



lotype a, U. S'! N. M. 



No. 37985 (1754a and b), 

 4 

 dorsal surface. X — • 



Figure 20. 



num. X 



Same, ster- 

 T 



Fig. 19- 



