Page:American Seashells (1954).djvu/391

Rh to 4. Radula of 80 plates which are horseshoe-shaped and with 6 strong, straight denticles. Not too common. C. aurantiaca A. and H. is the same species. Genus Tergipes Cuvier 1805 Body slender; tentacles simple, the oral pair very short. Branchiae not very numerous, fusiform, inflated, set in a single series on each side of the back; foot narrow, anterior angles rounded. Egg mass kidney-shaped. Rad- ula with a single row of plates, each with a stout central denticle and numer- ous delicate marginal denticles. Tergipes despectus Johnston Johnston's Balloon Eolis Plate i5d Arctic Seas to New York. Europe. % inch in length, characters as shown in our figure and in the generic description. Gregarious on hydroids. Shore to 8 fathoms. Common (?). Fa7nily GLAUCIDAE Genus Glaucus Forster 1777 Glaiiciis mamnis Du Pont 1763 Blue Glaucus Worldwide, pelagic in warm waters. 2 inches in length, body elongate, head small. Tentacles and rhinophores very small. 4 clumps of vivid-blue frills on each side of the body. Dorsal side smooth, striped with dark-blue, light-blue and white. Underside pale grayish blue. With strong jaws and a radula of a center row of about 10 denticulated teeth. Moderately common at certain seasons. Washed ashore with Janthina, the Purple Sea-snail. G. atlanticiis Forster, G. radiata Gmelin and G, forsteri Lamarck are all this species. Family FLABELLINIDAE Genus Eiibranchiis Forbes 1838 Resembling Tergipes. Radula with central plate with several stout denticles. A triangular lateral tooth is on each side of the central plate, Eubranchus exiguiis Alder and Hancock Dwarf Balloon Eolis Plate 15c Arctic Seas to Boston, Massachusetts. Europe. % inch in length, characters as shown in our figure and the generic description. Seasonally uncommon.