IlSr SOUTH-EASTERN" PENNSYLVAmA. 



361 



Figs. 1, 4, indiirite ; surface pale greenish, with hard projections left by decay ; 

 a chip fi'om 'No. 4, shows a black interior. When entire, the length of this specimen 

 may have been about five inches. 



Figs. 3, 9, 13, resemble cherty limestone, but do not effervesce with acid : No. 9 

 and 13 are pale bluish, ISTo. 13 darker. 



Fig. 5, dark indurite, gritty from decay and having several projecting nodules, 

 like No. 1 and 4 : surfece greatly decayed. 



Fig. 6, a pale brown grit ; robust, chipped coarsely but with skill ; lines of frac- 

 ture distinct, a sharp medial ridge on the inferior surface, extending about three 

 inches from the point : length 4, greatest thickness f inch. 



In Fig. 7. the surface is hke that of No, 5 : robust ; length 4, breadth 1|, greatest 

 thickness | inch, due to a bulge on the upper surface. 



Fig. 8, material cherty, black, without gloss (resembling Figs. 11, &c. of PI. 6) : 

 edges finely chipped and somewhat serrulate towards the apex : ridges or fracture 

 distinct : length 4 3-16, greatest thickness f inch. A second example was found. 



Fig. 9, thin and delicate, inferior surface flat, up])er surface shaped with a few 

 flat chips : length 3f , greatest thickness less than | inch, due to a bulge near the 

 base. 



Fig, 10, a black glossy chert or flint, but less glossy than Figs. 3 and 17 of PI. 

 6 : both sides neatly worked ; ridges of fracture low but distinct : length 2|, greatest 

 thickness ^ inch. A well finished and rare specimen, one of the finest found, which 

 might, perhaps, be classed with arrow-heads. I have seen a specimen very like it, 

 found in Ohio. 



Fig. 11, pale bluish, surface roughened and lines of fracture lost by decay. 



Fig. 12, a coarse specimen of rough grit ; old, but lines of fracture apparent. 



F^ig. 13, represents the apical portion of a bi'oken lance-head somewhat resemb- 

 ling No. 7, but of a kind wider and flatter, leaf-shaped or oval, with a rounded base, 

 of which Dr. Abbott's Fig. 38 (1875) is an average form on the Susquehanna, and of 

 Avhich the Retreat furnishes a fragment (rather more than the basal half) which 

 scarcely differs from the corresponding part of Abbott's figure. Its material is that 

 of Figs. 3 and 9 ; its greatest thickness about f inch. 



