0. Harger—New Fossil Spider from the Coal Measures. 219 
MOLLUuSCA. Petricola pholadiformis Lam. 
Pecten tenuicostatus Migh. Mactra lateralis Say. 
Yoldia hmatula Say. Pandora trilineata? Say. 
*“ sapotilla Gould. Turbonilla i ta Totten 
Nucula delphinodonta Migh. Lunatia triseriata Say. 
Astarte undata Gould. trivittata Say. 
Cyprina Islandica Linn. Buccinum undatum Linn. 
ardium pinnulatum Con. Sipho pygmeus Gid. 
Callista convexa Say. Bela cancellata Migh. 
Art. XXVI.—Notice of a new Fossil Spider from the Coal 
Measures of Illinois; by O. HARGER. 
Arthrolycosa* antiqua, gen. et sp. nov. 
7) quad, & Pp 
Tux fossil spider, represented in the accompanying figure, 
was found by. Mr. S. S. Strong, in one of the well known iron- 
apparently the 
figu 
| ure. pon 
dible are two 
being absent. The first of these four appendages shows, in 
Connection with the cephalothorax, two segments and a part 
* From dp8pov, a joint, and Abxog, a spider, referring to the segmentation of the 
abdomen, 
