22 



FIG 18, 18a. 



Ef/3. ISOCaSCLE, TRIANGULAR CHOPPER, WITH 



SLIGHTLY CONCAVE BASIS. Old Beach. 



Fig. 18, Indical face. Fig. 18a, Pollical face. 



One of the finest Arch^olithes that has ever come un- 

 der my examination is the next one, fig. 19. This imple- 

 ment is an almost perfect right-angled triangle, whose 

 hypothenuse is slightly convex. This specimen belongs to 

 that type which I call right-handed triangular Archaeo- 

 lithes, because, when laid on the Pollical face, with the 

 point upwards, the hypothenuse is on the left, and the 

 right angle at the right side. 



FIG. 19, 19a, 19b. 



Ef/1. RIGHT-HANDED TRIANGULAR CHOPPER. 

 MOST ELABORATELY WORKED. Old Beach. 



Fig. 19, Indical face. Fig. 19a, Pollical face. Fig. 

 19b, side view. 



The left-handed triangular Archfeolithe is just the 

 reverse of the former ; in this case the hypothenuse is on 

 the right, the right angle on the left side. It is remark- 

 able that in most of the specimens of this type the point 

 of the angle is more or less rounded off, so as to form, in 

 some instances, an almost continuous curved edge, without 

 liowever, losing the triangular shape. 



The last group of the choppers is represented by speci- 

 mens of almost extreme thickness ; in fact, the thickness 

 is BO great as to prevent a firm grip, and it seems there- 

 fore very probable that this group merely represents un- 

 finished rejects- So far, all the specimens of this group 

 which have come under examination show an elongate 

 shape. 



Eg. FIG. 20, 20a, 20b. 



ELONGATED CHOPPER OF EXTREME THICK- 

 NESS; POLLICAL FACE NICE AND FLAT; 

 INDICAL FACE PROBABLY NOT FINISHED. 



South Arm. 

 F. KNIVES. 



This large group comprises all those forms in which 

 the length considerably exceeds the breadth. Typical 

 specimens are usually thin ; if they become small there is 

 practically no difference from the lamelliform Archseolithes 

 of group De., though one would not have the slightest 



