^L. auricula.^ This little iridescent jellyfish, which measures about one and a half inches in diameter, is commonly found attached to eel-grass by a stalk-like projection of the top of the umbrella. Short, globe-tipped tentacles are arranged in eight clusters, each cluster on a raised prolongation of the margin of the umbrella, and in the center of each space between them is a dark kidney-shaped organ called the /anchor/. These anchors are used for holding, either for suspension or when moving from place to place. The mouth forms a slight quadrangular projection in the center of the bell-like expansion. The arm-like projections are mottled with two rows of spots, which are the ova. Although a free form and capable of moving about, /Lucernaria/ is sedentary in habit. It is sometimes found free, but generally attached by its extremity to eel-grass or /Fucus/, seldom to rocks. It is constantly changing its shape. The one it most frequently assumes is that of a cup or inverted bell. It is found on the New England coast. (Plate XLIV.) ORDER =PEROMEDUSÆ= ("/Maimed medusæ/") GENUS ^Pericolpa^ ^P. quadrigata.^ Umbrella conical and divided by a horizontal constriction into two parts, the lower one being again divided into lobes. There are four long tentacles and four tentaculocysts. It is not found on the coasts of the United States. [pg137] ORDER =CUBOMEDUSÆ= ("/Cube-medusæ/") GENUS ^Charybdæa^ ^C. marsupialis.^ Umbrella square, flattened on top, and of firm consistency. Four tentacles fall from lobes on the umbrella, and four club-shaped eyes are in marginal notches. Plate-like egg-sacs follow each side of the four radial canals. The bell is one inch in diameter and about two inches in height. It is not found on the coasts of the United States. ORDER =DISCOMEDUSÆ= ("/Disk-medusæ/") SUBORDER ~SEMOSTOMÆ~ GENUS ^Aurelia^ [Illustration: /Aurelia flavidula/, about one fourth natural size.]