^C. annulatum.^ A remarkable species of /Calliostoma/, found in California. The whorls are adorned with revolving rows of raised dots, and the sutures are frescoed in exquisite purple. This beautiful species lives upon seaweed, and on pleasant days comes to the surface of the water. It can then be collected from a boat by drawing in quantities of seaweed. It is very unlikely that the collector will ever find a specimen upon the beach, for the shell is too fragile to withstand the rough handling of the waves. Length one inch. ^C. canaliculatum.^ The largest member of this genus to be found in American waters. It resembles the last species in form, but lacks the purple sutures. The revolving ribs are very numerous and prominent. There is no umbilicus. Length one to one and a half inches. Found on the Pacific coast. ^C. costatum.^ A heavier shell than the preceding, with somewhat more rounded whorls. Reddish-brown in color; numerous revolving ridges; no umbilicus; about three quarters of an inch in length. It is found in rocky places, and sometimes in considerable numbers, just at low-tide mark. Found in California. [pg362] GENUS ^Chlorostoma^ This genus is represented in California by several species, the commonest of which is probably /C. funebrale/—a doleful name, no doubt given on account of the jet-black color. ^C. funebrale.^ The shell is thick and strong, like most between-tide species, which are constantly exposed to the buffeting of the waves. It is to be found in countless thousands upon rocks exposed at low tide, and may be gathered at any time except full flood-tide, like the littorinas and purpuras of the east coast. Within the aperture the surface is nacreous and greenish in tint; the last whorl is drawn in, like gathers, at the suture. The umbilicus is closed. There is a white nodule at the base of the lip of the columella. Length one half of an inch to one inch. (Plate LXVII.) ^C. brunneum.^ This species is brown, as its name would indicate, and there is greenish nacre within the aperture. It lives upon kelp, or upon rocks at very low tide. Length about an inch. (Plate LXVI.) GENUS ^Trochiscus^ ^T. norrisi.^ A flattened shell with rounded, dome-like spire and obtuse apex; a fairly common species. It has a wide, deep umbilicus and a sharp lip. It is of a rich brown color, with dark chestnut about the umbilical region and greenish-white within the umbilicus; there is a band of dark olive-green about the inner margin of the lip. The shell is about two inches in diameter and of a somewhat greater height. The operculum is multispiral, with a central nucleus, and is shaggy and rough. Like all other trochids, it feeds upon algæ. It is often found upon the beach after violent storms. Found in California, south of San Francisco. (Plate LXVI.) GENUS ^Livona^