Rows of tube-feet lie within these grooves. The ambulacral grooves are supported by a definite arrangement of ossicles: two rows of rod-shaped ambulacral ossicles form the V-shaped ambulacral groove itself. Where these meet they form the prominent ambulacral ridge on their inner surface.bove: the oral surface of a starfish. The mouth is visible in the centre of the disc, in the middle of a circular or pentagonal peristomial membrane or peristome (shown in darker orange). A groove, called the ambulacrum, extends from the tip of each arm toward the peristome.
Lyons, Colorado. The Town of Lyons is a Statutory Town in Boulder County, Colorado, United States. The town population was 2033 at the 2010 United States Census, up from 1585 at the 2000 United States Census. Lyons is located at the confluence of North St. Vrain Creek and South St. Vrain Creek, 20 miles (32 km) east of Rocky Mountain National Park.
From Wikipedia, the free encyclopedia. Lyons is a city in Linn County, Oregon, United States. The population was 1,161 at the 2010 census. The center of population of Oregon is located in Lyons.