Handbook of Paleontology 125 



was introduced from the south on oyster shells. This 

 species is small, about a quarter of an inch wide and 

 three-eighths high. The body is olive-green or brown in 

 color, with longitudinal orange, or lemon-yellow, streaks ; 

 and the 48 tentacles are light brown, almost white. The 

 Crimson or Rose Anemone (Tealia (Rhodactinia) crassi- 

 cornis) is found in tide pools and on ledges covered with 

 Rockweed from Cape Cod north. It is a thick-petaled 

 form three inches in diameter and the color varies, being 

 bluish green mottled with crimson, bright cherry-red or 

 flesh colored. The Brown Anemone (Metridium mar- 

 ginatum) is found at low- water mark in tide pools, under 

 large stones, in sheltered crevices of rocks, on piles and 

 wharves. It is common from New York northward and 

 is the most conspicuous and abundant sea anemone of the 

 New England coast. Sometimes it measures ten inches 

 across the disk, and there is an allied species found in 

 Florida that measures 18 inches in diameter. 



Almost all divisions of the echinoderms — sea urchins, 

 sea cucumbers, brittle stars and starfishes — are repre- 

 sented in the tide pools. The Green Sea Urchin (Strongy- 

 locentrotus drobachiensis) is the common species in 

 shallow water of the northern temperate zone. These 

 creatures are green or greenish-purple in color. In some 

 pools they form a carpet of green spots like tufts of moss. 

 This form occurs in the deep waters of Long Island 

 sound; north of Cape Cod in shallow tide pools; and on 

 the Maine coast, where it is exceedingly abundant, it liter- 

 ally covers the rocks. On the Atlantic coast its range is as 

 far south as New Jersey, but in its most southern distribu- 

 tion it is rare and small. On the Pacific coast it extends as 

 far south as the state of Washington. The Purple Sea 

 Cucumber (Thy one briareus) is a shallow water form 



