L. t. parvâ, subglobosâ, albâ; anfr. nucl. ii. lævibus, apice satis extante; anfr. normalibus iii., carinis in spirâ maxime extantibus ii., anfr. ult. vi.; suturis subrectangulatis; aperturâ circulari; labro extus parum contracto; labio conspicuo; umbilico haud magno.
Long. 0.12, long. spir. 0.06, lat. 0.10, div. 95°.
Hab. Catalina Island, 10-20 fms. 4, alive; Monterey, 4, dead, dredged?
This pretty little Cyclostomoid species is easily recognized by the sharp revolving keels, and absence of radiating sculpture.
Amycla H. & A. Adams, 1858.
Amycla undata Carp. n. sp. State Collection, Species 1067.
A. t. parvâ rufo-fuscâ, turritâ, epidermide tenui indutâ; marginibus spiræ subrectis; anfr. nucleosis iv. lævibus, tumidis, apice mamillato; anfr. normalibus v. valde tumidis, suturis impressis; costis radiantibus ix. valde tumidis, latis, antice et postice obsoletis; interstitiis undatis; liris spiralibus acutioribus, distantibus, costas superantibus, secundum interstitia eleganter undulatis, quarum vi.—viii. in spirâ monstrantur; aperturâ ovali, in canalem brevem rectam productâ, intus haud liratâ; labro acuto, labio acuto extanti ad suturam juncto; columellâ planatâ: operculo nassoideo. ?
Long. 0.44, long. spir. 0.20, lat. 0.20, div. 45°.
Hab. Catalina Island, not rare, 30-40 fm. 10, some alive.
The nuclear whirls in this shell resemble a minute Paludina. The only operculum in the specimens sent was broken in extraction, but appeared to be Nassoid. The sculpture consists of elongate knobs swelling in the middle; with spiral lines hanging as it were from pier to pier, as in a suspension bridge. The aperture is somewhat Columbelloid, the inner and outer lips joining at the suture; but neither are lirate within, although they have that appearance from the outside sculpture showing through.