Page:American Seashells (1954).djvu/181

Rh Shell smooth except for microscopic, spiral scratches. Color light-tan to brown with the spire tinted with purplish rose. Often confused with Litiopa which has a blade-like ridge on the columella just inside the aperture. Common from low water to 25 fathoms. Alias L. divaricata Fab. and solidula Loven.

$1/4$ inch in length, moderately fragile, similar to the other Lacunas, but characterized by its very narrow, long, chink-like umbilicus and by the carinate periphery of the whorl which bears a fine, dark-brown spiral line. Early whorls usually pinkish, remainder yellowish tan. Umbilicus and columella white. The peripheral carina may be weak or obsolete, and the color line may consist of a series of faint, slanting streaks of light reddish brown. Very common in littoral seaweed and kelp in southern California.

$3/8$ to $1/2$ inch in length, 3 to 4 whorls, moderately fragile. Aperture semi-lunar, large. Outer lip thin. Columellar chink large, long and white. Shell smooth, chalky-white, but always covered by a thin, yellowish brown, smooth periostracum. Common on kelp weed. L. porrecta Cpr. and striata Gabb are the same. Do not confuse with vincta which has a higher spire and much narrower, brownish-tan umbilical chink.

$1/4$ inch in length, similar to unifasciata, but having a very deep umbilical chink which is bordered by a sharp ridge. The spiral carina at the level of the suture is very small, but quite sharp. The yellowish tan shell has mottlings or oblique bands of darker color. Moderately common in eel-grass along the shore.

$1/2$ inch in length, fragile, 3 whorls; body whorl large. Resembles a