D. t. parvâ, turrito-conicâ, cerinâ, politâ, nitente; anfr. nucl. ii. naticoideis, vertice mamillato, apice indistincto; norm. v., omnino planatis, suturis indistinctis; peripheriâ acute angulatâ, vix carinatâ; basi omnino planatâ; aperturâ subquadratâ; peritremati continuo; labro postice paullum contracto; labio appresso; columellâ antice angulatâ, vix sinuatâ.
Long. 0·15, long. spir. 0·09, lat. 0·07, div. 29°.
Hab. Catalina Is. 8-10 fm.; on beach to Monterey. Cooper.
Diala marmorea, Cpr. n. s.
D. t. solidâ, exacte conicâ, læviâ, nitente; subdiaphane pallidâ, rufo maculatâ; anfr. nucl. rotundatis, planorbeis, sub-oblique sitis, apice celato; norm. vi. planatis, suturis indistinctis; basi planatâ, sub-angulatâ; aperturâ ovali, peritremati continuo, haud varicoso.
Long. 0·17, long. spir. 0·11, lat. 0·08, div. 31°.
Hab. Monterey, S. Pedro; Cooper. Lower California, off Haliotis. Rowell.
The description is written from a single perfect specimen in Mr. Rowell’s collection, and some fragments from the shell-washings of Dr. Cooper’s.