THE BEACH AGAIN. 
101 
markable nidus^ called sand-circle,” looking like the top 
of a stone jug without the stopple, and broken on one 
side, or like a flaring dickey made of sand-paper. Also, 
Cancellaria Couthouyi (?), and 
Periwinkles (?) {Fusus decemcostatus). 
We afterward saw some other kinds on the Bay sideo 
Gould states that this Cape “ has hitherto proved a bar¬ 
rier to the migrations of many species of Mollusca.” — 
‘‘Of the one hundred and ninety-seven species [which 
he described in 1840 as belonging to Massachusetts], 
eighty-three do not pass to the South shore, and fifty are 
not found on the North shore of the Cape.” 
Among Crustacea, there were the shells of Crabs and 
Lobsters, often bleached quite white high up the beach; 
Sea or Beach Fleas {Amphipoda) ; and the cases of th^ 
Horse-shoe Crab, or Saucepan Fish {Limulus Polyphce^ 
mus)j of which we saw many alive on the Bay side, 
where they feed pigs on them. Their tails were used 
as arrow-heads by the Indians. 
Of Radiata, there were the Sea Chestnut or Egg {Fchi^ 
nus granulatus)^ commonly divested of its spines; flat 
circular shells (ScuteUa parmaf) covered with choco¬ 
late-colored spines, but becoming smooth and white, with 
five petal-like figures; a few Star-fishes or Five-fingers 
{Asterias ruhens) ; and Sun-fishes or Seu-jellies {Aure- 
lice). 
There was also at least one species of Sponge. 
The plants which I noticed here and there on the 
pure sandy shelf, between the ordinary high-water mark 
and the foot of the bank, were Sea Rocket ( Gakile Ameri¬ 
cana)^ Saltwort {Salsola Jcali), Sea Sandwort (Honlcenya 
feploides)^ Sea Burdock (Fanthium echinatum)^ Sea-side 
Spurge {Euphorbia polygonifolia) ; also, Beach Grass 
