Only one specimen having been seen, without animal or even operculum, the genus is doubtful. In its slight labial deposit it resembles “Litiopa” dubiosa, C. B. Adams.
Genus Cythna, A. Adams.
Cythna albida, Cpr. n. s.
C. t. minutâ, albidâ, lævi, diaphanâ, latâ; anfr. nucl. normalibus, vertice mamillato; norm. iii. tumidis, rotundatis, rapide augentibus, suturis valde impressis; basi rotundatâ, valde umbilicatâ; umbilico subangulato; aperturâ subrotundatâ; peritremati continuo, acuto, t. adultâ nonnunquam à pariete separato.
Long. 0·03, long. spir. 0·015, lat. 0·025, div. 80°.
Hab. S. Pedro; in shell-washings. Cooper.
Known from C. tumens, Maz. Cat. No. 421, by the non-keeling of the umbilicus.
Genus Chrysallida, Cpr.
Chrysallida pumila, Cpr. n. s.
Chr. t. minutâ, angustâ, albâ; vert. nucl. subito immerso, dimidium truncationis tegente; marginibus spiræ parum excurvatis; anfr. norm. iv. planatis, suturis vix distinctis; clathris radiantibus rectis, validis, planatis, circ. xx., marginibus spiræ utroque latere parallelis, sæpius attingentibus, circa basim elongatam, rotundatam continuis; interstitiis lirulis acutis distantibus, haud extantibus, circ. x. decussatis, quarum iv. v. in spirâ monstrantur; aperturâ ovali, peritremati vix continuo; plicâ parietem tenus acutâ, haud celatâ, declivi.