Descriptions of New Marine Shells from the Coast of California.
PART I.
BY PHILIP P. CARPENTER, B.A., PH.D.
Corresponding Member of the Académies of Philadelphia and California, etc.
Warrington, England, May 4th, 1864.
The shells to be described in these papers were collected by Dr. J. G. Cooper, for the State Geological Survey of California. Being aware that I was engaged in preparing descriptions of the shells of the Smithsonian collections, to serve as a handbook on the Mollusca of the western coast, and also (at the present time), a “Supplementary Report on the present state of our knowledge of the Mollusca of the west coast of North America,” for the British Association; he has very obligingly transmitted to me such duplicates as could be spared from the State collection for identification.
Calliostoma Swainson, 1840.
Calliostoma formosum Carp. n. sp. State Collection, Species 615 a.
C. t. subelevatá, brunnescens, fusco-purpureo nebulosa, anfr. vii. valde tumentibus, suturis impressis; carinis majoribus in spirâ duabus, gemmatis, interdum brunneo huc et illuc tinctis; serie granulorum minorum prope suturam; serie quartá minimorum inter duas carinas; lirulis basalibus circ. ix., fusco maculatis; interstitiis à lineis incrementi corrugatis; aperturá subquadratá. Long. 0.47, long. spir. 0.34, lat. 0.43, div. 68°.
Hab. San Pedro five; San Diego four dead on beach at low water—very rare. It is well distinguished by the two principal necklaces, with smaller rows intercalating. In coloring it resembles C. eximium Reeve, (versicolor Menke, Mazatlan Catal.), from the Gulf of California.
Calliostoma splendens Carp. n. sp. State Collection, Species 530 a.
C. t. parvâ, latiore, tenuiore; exquisité rufo-castaneo et purpureo, interdum intensioribus, et livido, varie nebulosâ et punctatâ; anfractu primo nucleoso diaphano, granuloso, apice mamillato; dein iv. normalibus, subtabulatis; primo costibus spiralibus ii. acutis, valde expressis, alterâ parvâ suturali; anfr. penult. costis iii. quarum media extantior, superior subgranulosa; anfr. ult. aliis intercalantibus, supra peripheriam v. quarum tertia magis extans; interstitiis à lineis incrementi vix decussatis; costâ circa peripheriam angulatam conspicuâ; basi costulis rotundatis, haud extantibus, peripheriam et axim versus conspicuis, medio sæpe obsoletis; basi nitidâ, subplanatâ; aperturâ subquadratâ, intus carneo-nacreâ, valde splendente: operculo tenuissimo, levissimo, pallido, diaphano, concavo; anfr. circ. x. crebris, parum definitis.