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21.

11. Give a list of the new genera and subgenera, species and subspecies described in the papers referred to in the answer to question 10 (e.g., Gonodela rhabdophora. W.J.Holland. (Lep.) Masai Land, Africa.  [[underline]]Proc.U.S.Nat.Mus.,[[/underline]]XVIII, No. 1062, May 27, 1896, p.256, pl. VIII, fig.5).  If the type specimen is not in the National Museum, that fact should be indicated by the use of an asterisk.


Classification of Arrow- and Spear-heads or Knives.

Division I:  Leaf-shaped.

Class A:  This and finely shaped implements of the form of a laurel-leaf;  elliptical and pointed at both ends.  They correspond substantially with the french solutréen type of the Paleolithic period of the stone age.

Class B:   These may be thicker and ruder than Class A.  Some are more oval, and the bases are not pointed[[strikethrough]],[[/strikethrough]] but are either straight or convex.   The class includes the leaf-shaped ^[[argillite]] implements found by Dr. Abbott in the Delaware river- gravels at Trenton, N. J. 

Class C:  These are long thin blades with nearly straight edges,  more like a dagger or poniard.   The base may be either convex- straight or concave.   Many of them show traces of attachment to a handle by means of bitumen or gum.   They are peculiar to the Pacific Slope.

Division II:  Triangular.

This division includes all forms approaching a triangle, whether the bases or edges be convex, straight, or concave.   They are without stems, and consequently without shoulders, but in some specimens the concavity of the base produces barbs.

Division III:  Stemmed.

This division includes all variations of stems, whether straight, pointed, or expanding, and all varieties of bases and edges, whether convex, straight or concave.

Class A:  Lozenge-shaped, stemmed but not shouldered nor barbed.
 
Class B:  Stemmed and shouldered but not barbed.
 
Class C:  Stemmed, shouldered and barbed.

[[underline]]NOTE[[/underline]]--Nearly all of the convex bases are smooth as though they had been worn.   The purpose or cause of this is not known.