April, 1901. The Island of La Plata — Dorsey. 263 



RECTANGULAR STONES WITHOUT ORNAMENTATION. 



These stones are of the same material as those in the category 

 just described and all have been fashioned with similar care (see PI. 

 LII ). The largest one found measures four and one-half inches in 

 breadth by five and one-half in length and in the center measures one 

 inch in thickness, the center being slightly thicker than the ends. 

 The smallest specimen of this sort found measures one and one-half 

 inches by one and one-quarter inches in length and breadth and is 

 one-fourth of an inch thick. Between these two extreme sizes was 

 found a complete intervening series, so that for whatever purpose the 

 smallest stone was used, that also was probably the character of the 

 largest of the series. What this purpose was I have no suggestion to 

 offer. Closely related to these rectangular stones, and in fact forming 

 a connecting link between them and the series next to be described, 

 was a series of stones of somewhat the same general type but having 

 an elliptical shape (see PI. LIIl ).. Stones in this series were found 

 ranging from four inches in length down to two and one-half. 



CIRCULAR-STONES WITHOUT ORNAMENTATION. 



These stones ( see PI. LLV) vary in diameter from four inches in 

 the case of the largest to one and one-half inches in the smallest. 

 The diameter in no case exceeds one-half of an inch. The specimens 

 are generally slightly thicker at the center than they are at the sides 

 and all have been prepared with care. An examination of the edges 

 does not reveal any mark of use and naturally owing to their soft- 

 ness, like the category previously described, they could not have 

 served as implements. Two of the disc-shaped stones, one of which 

 was made with unusual care, are perforated in the center ( see PL 

 LV ). It might be possible to consider these as spindle whorls, were 

 it noj: for the fact that in one of the refuse heaps two small beautifully 

 engraved spindle whorls were found, which have nothing to distinguish' 

 them from those found throughout the west coast of South America 

 from Ecuador to Chili. 



CYLINDRICAL-SHAPED STONES, NOT PERFORATED. 



The stones in this category are rather uniform in size and 

 average about three inches in length by one in diameter ( PL LVI ). 



