^P. reticularis.^ This starfish is the largest species on our coasts. It is common in southern Florida close to the shore. The body is three to four inches thick, flat on the oral surface, but raised on the upper side, and tapers down in wedge-like form to the points of the short arms. The prominent blunt spines which cover its surface are arranged in a somewhat regular net-like order, and the sharp-edged margins have an even row of larger spines of the same form. The madreporic plate is nearly in the center of the disk, and is quite conspicuous, being bordered with a circle of small spines. Its color is dull yellow, and its size often a foot or more in diameter. It is the large starfish so often seen in curiosity-shops. (Plate LII.) GENUS ^Nidorella^ ^N. armata.^ This very curious pentagonal species, found on the California coast, is five to six inches in diameter and red in color. The upper surface is raised and covered with thick, pointed spines one half of an inch to one inch long, arranged in lines, but not crowded. The ossicles on the margins are large; some of them are hemispherical and bear large spines. Smaller spines border the under edge of the margins. (Plate LIII.) FAMILY ~ASTERINIDÆ~ The starfishes of this family are pentagonal, with a large body and short arms. The disk is more or less elevated in the center, and the edges are sharp. There are two rows of ambulacra. The ossicles are notched and overlapping. The family is confined to temperate and tropical waters. GENUS ^Asterina^ ^A. folium.^ Small, pentagonal, swollen (gibbous). Found on the Florida coast. [Illustration: PLATE LII. Ctenodiscus crispatus. Astropecten articularis. Luidia clathrata. Hippasteria phrygiana. Pentaceros reticularis.] [Illustration: PLATE LIII. Nidorella armata. Asterina miniata. Solaster decemradiata. Crossaster papposus.] ^A. miniata.^ Pentagonal; somewhat raised in center; about one and a half inches across; edges sharp. Found on the California coast close to shore. (Plate LIII.) ORDER =CRYPTOZONIA= FAMILY ~SOLASTERIDÆ~ GENUS ^Solaster^ ^S. endeca.^ Dark red in color; nine to eleven arms, which are shorter than the breadth of the disk; diameter of disk about five inches; two rows of ambulacra; surface rather smooth. Common on the coast of Maine, and found from Cape Cod to Newfoundland below low-water mark. ^S. decemradiata.^ This species is common on the North Pacific coast. It has ten arms, which are about twice the length of the diameter of the body, the whole body being about a foot across. (Plate LIII.) GENUS ^Crossaster^