FOSSILS OF THE TERRACE TERIOD. 739 



rianorhis parvus Say. — Abuudaiit. Diameter, 6.5 "'. 



I'isidimn variahile Fi-ime. — Abundant. Length, 2"""; Avidth, 2i""". 



Ranuncuhis (((ptafilis L. — A single well-preserved plant. This and the 

 following-, Avith one exception, are from the old oxbow in Hadley, described 

 on page 737. 



Acer saccltarinnm Wang. — Leaves. Rare. 



Prunus virginiana L. — Seeds very abundant; leaves abundant. "River 

 banks. Common, especially northward" (Gray). 



Phdamis occidentalis L. — Leaves, large branches, and balls found in 

 great abundance. 



]\Iatted masses several inches thick and many feet broad consist almost 

 entirely of leaves, many of the largest size. Large branches, often very 

 much flattened and still covered witli the characteristic bark, occur fre- 

 quently. 



Li several cases delicate hollow globes of sand, like globes of lace or 

 Chinese hollow i^'ory balls, have been formed liy the penetration of the 

 fine sand to the surface of the central ball, and its spreading in the regular 

 interstices which suiTOimd each point of attachment of a seed, where the 

 grains have been slightlj" agglutinated and left as a globe of lace on the 

 rotting of the seed ball. The extreme northern range of the species is 

 Lake Champlain and Montreal.^ 



Jufilans cinerea L. — Dwarf nuts, 1^ to If inches long-, f to | inch wide; 

 less deeply sculptured than the form now common here. In one case nine 

 specially prominent ridges are present. In another the I'idges are more 

 rounded, broad, and irregular than now. The species now extend south to 

 Georgia, and north through Canada, but this dwarf form would seem to 

 indicate a station near its south border. 



Carya amara, Nutt. — At the old oxbow occurred an impression of an 

 exterior inclosing a cast of the interior of a single specimen in rusty clay. 

 Also well-preserved nuts in abundance were given me by Dr. Edward 

 Hitchcock, as found at extreme low water below the mouth of Fort River, 

 opposite the fourth pile of Mclndoes's boom, counting from the north — 

 rounded, thin-shelled nuts, averaging somewhat larger than nuts of the same 



' Michanx, Sylva, toI. 6, p. 56. 



