This useful monograph is an extension of the author’s pilot study, published in 1938. It includes data from 316 new specimens that were recorded between 1961 and 1963. The concern is primarily with stone axes which occur only in the ceramic periods. These are divided into rectangular, collared, and petaloid forms, and since the latter are most common, they receive the most extensive treatment. Herrera Fritot has developed a procedure which permits him to classify and describe with great precision. Data on length-width indices are supplied in a number of tables, along with information on the frequency of each form. There is also an excellent discussion of aberrant specimens. The illustrations are good, and the provenience of the illustrated specimens is given when known.