? N. t. parvâ, carneâ, lævi, tenuissimâ; vertice “Emarginulæ” simulante, subspirali, sed apice patelloideo, adunco; t. adultâ valde elevatâ; margine laterali antico subrecto, apice projiciente, valde remoto; postico maxime fornicato; aperturæ margine antice et postice prolongato.
Long. 0·26, lat. 0·19, alt. 0·20, div. 80°.
Hab. Catalina Island, 10-20 fm., 4 dead, Cooper.
This may be the young of the long-lost Patella calyptra, Mart. It may be a Scutellina. Even the genus cannot be predicated from the shell alone.
Genus Acmæa, Eschholtz.
Acmæa (? pileolus, var.) rosacea, Cpr.
A. t. parvâ, conicâ, tenui, lævi; t. jun. pallide rosaceâ, elegantissime maculis albis et fuscis subradiatim sparsis; t. adulta strigis fusco-rosaceis et albidis pictâ; apice elevato, parum antico; intus rosaceo.
Long. 0·20, lat. 0·16, alt. 0·08, div. 100°.
Hab. San Diego, 1 sp. jun. (Palmer): Monterey, 1 dead sp. Cooper.
The absence of striæ, very thin texture, and regularly conical growth, distinguish this shell from A. patina, a rare variety of which has a pinkish tinge. Specimens in Mus. Cuming are marked “pileolus, Midd.,” but do not accord with the diagnosis. It is almost exactly like Herm[19] specimens of A. virginea. Col. Jewett’s similar shells, marked “Panama,” were perhaps West Indian.