_Margarita acuticostata_ Carp. n. sp. State Collection, Species 354. M. t. _M. lirulatæ_ simili; parvâ, tenui, albido-cinereâ, olivaceo-fusco varie maculatâ, seu punctulatâ; anfr. nucleosis ii. lævibus, tumidis, fuscis, apice mamillato; anfr. norm. iii. tumidis, tabulatis, suturis rectangulatis; carinis acutis in spirâ iii., quartâ peripheriali, æquidistantibus; interstitiis spiraliter striatis; in spirâ et circâ basim radiatim creberrime striulatis; basi subrotundatà, lirulis distantibus circ. ix. ornatâ; umbilico magno, infundibuliformi, vix angulato, intus interdum striis spiralibus paucis sculpto; aperturâ subrotundatâ, pariete parum attingente: operculo anfr. paucioribus, circ. vi. suturis subelevatis. Long. 0.18, long. spir. 0.12, lat. 0.19, div. 87°. _Hab._ Santa Barbara, in kelp-root, 2, dead; Catalina Island, 8-10 fms. 20, some alive; Monterey, 20 fms. 4, dead. This shell might be taken for a delicate form of _Gibbula parcipicta_, which in painting it exactly resembles. It is known from the Vancouver _M. lirulata_ by the three sharp keels on the spire, between which there are no others intercalating, and by the details of sculpture. The patches of color are very variable, sometimes scarcely appearing; and are generally deeper tinted on the keels, giving a false appearance of granulation. _Margarita salmonea_ Carp. (? var.) State Collection, Species 352. M. t. inter _M. undulatæ_ et _M. pupillæ_ intermediâ; minore, spirâ satis elevatâ; anfr. nucl. iii. purpureis; dein iv. normalibus, colore salmoneo; liris spiralibus in spirâ viii., quarum ii. suturales, minimæ; suturis haud undulatis; interstitiis à lineis incrementi creberrimis, haud elevatis, sculptis; basi lirulis creberrimis, æqualibus, circ. xviii. ornatâ; aperturâ subquadratâ; umbilico minore, angulato: operculo tenuissimo, diaphano, anfr. circ. x. vix definitis. Long. 0.22, long. spir. 0.14, lat. 0.22, div. 80°. _Hab._ Monterey, 6-20 fms. 5, alive; Catalina Island, 30-40 fms. 2, alive. This shell differs from the common _Margarita_ of the Vancouver district (_M. pupilla_ Gld. = _calliostoma_ A. Ad.), in its much deeper and salmon-tinted hue; its finer sculpture, absence of decussation, and want of distant liræ round the umbilicus. From the Norwegian specimens of _M. undulata_ it is known by the absence of sutural waves, and by the finer basal riblets, of which the interstices are minutely sculptured across. The operculum differs from both, in its great thinness and smoothness. Additional specimens may better display its true relations.[10] LIOTIA GRAY, 1842. _Liotia fenestrata_ Carp. n. sp. State Collection, Species 1006.