CARBONIFEROUS ARTHROPOD FA UNA 1 8 I 



A single specimen represented by one-half of an ironstone 

 nodule from Braidwood, 111., collected by Mr. M. Fischer. This 

 is by far the largest Anthracomart-spider yet discovered. The 

 great size of the abdomen and the contrastingly small cephalo- 

 thorax will readily distinguish it from the other genera of the 

 order. 



Type. Pal. Coll. No. 9232. 



2. Geraphrynus carbonarius Scudder (Plate V, Fig. 3; Plate VII, Fig. 3). 

 Proc. Am. Ac. Arts Sc. Vol. XX (1884), pp. 16, 17. 



A beautifully preserved specimen of this common species, 

 measuring 24°"", exhibits nothing unnoticed in Dr. Scudder's 

 lengthy description. The post-thoracic piece is triangular. 

 Pal. Coll. No. 9233. 



3. Architarbus rotundatus Scudder (Plate V, Fig. 2; Plate VII, Fig. 2). 

 Geol. Surv. III., Vol. Ill (1868) , p. 568, Fig. 4. 



A well-preserved specimen, showing nearly the whole of the 

 legs and the structure of the body, appears to belong to this 

 species. 



Pal. Coll. No. 9234. 



4. Kustarachne sulcata sp. nov. (Plate V, Fig. 5; Plate VII, Fig. 4). 

 Cephalothorax orbicular, nearly as broad as the abdomen, 



from which it is evidently, though not deeply, constricted. 

 Coxae meeting along a narrow median space which extends along 

 the whole length of the cephalothorax, stout, distinctly and 

 deeply punctulate; remainder of legs punctulate also, more slen- 

 der than the coxa, especially on the tarsal portion; metatarsus 

 as long as the basal portion of the leg together. Mouth parts 

 not distinct. Abdomen somewhat broader than the thorax, 

 elongate elliptical, its segmentation obscured, irregularly but 

 deeply punctulate, the punctures becoming obsolete in the mid- 

 dle, provided with a prominent lateral sulcus concentric with 

 and close to the margin, and with a broader and deeper longitu- 

 dinal one on the disc on each side of the middle. Abdomen 

 terminated by a triangular sessile pygidium consisting of two 

 and possibly three subsegments, its outline extending beyond 

 the regular oval of the abdomen, not punctured. The basal 

 appendages noticed in temdpes are not indicated, but there is a 



