Like S. communis, jun., but with the upper whorls slightly coronated.
Scalaria crebricostata, Cpr. n. s. State Collection, 393.
S. t. gracili, tenui, albâ; anfr. x. rotundatis, haud attingentibus; costis circ. xv., acutis, reflexis, vix attingentibus, lineis irregulariter spiralibus ascendentibus; costis juxta suturam eleganter coronatis; sculpturâ spirali, nisi striulis interdum exillimis, nullâ; aperturâ rotundatâ; umbilico nullo; operculo normali, dense corneo.
Long. 0·70; long. spir. 0·52, lat. 0·18, div. 26°
Hab. Monterey, San Pedro, Cooper, common.
= “Scalaria, unique” Mus. Cum. No. 32.
Somewhat resembles S. tenuis, Sby., but is not so turrited.
Genus Opalia, H. & A. Adams.
Opalia spongiosa, Cpr. n. s.
O. t. turritâ, parvâ, albidâ, marginibus spiræ rectis; anfr. ix. subplanatis, suturis impressis; costis undulantibus circ. xiii., plerumque (nisi ad suturas crenulatas) obsoletis; totà superficie lineis punctorum creberrimis, spiralibus, punctis creberrimis, minutis, altissimis; circa basim imperforatam costa anticâ latissimâ, spirali; aperturâ ovatâ, valde callosâ; operculo aurantiaco, paucispirali.