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Rh COSCINODON WRIGHTII, Sulliv.

Tab. 45.

pusillæ, compacte pulvinulatæ, terra obrutæ, e sordide viridi incanæ).

3-4 lineas altus, simplex vel fastigiato-ramo-sus, basi sola radiculosus.

arcte imbricantia; inferiora ovalia; superiora majora obovata, coclileariformi-concava; omnia apice eroso-dentata, costa valida in pilum incanum serratum lamina duplo longiorem exeunte instructa, basi laxe pellueide oblongo-areolata; cellulis mediis et apicalibus minoribus oblongo-ovalibus, illis valde chlorophyllosis, his hyalinis.

monoici: masculi in ramis terminales; perigonialibus ovatis vix costatis; antheridiis elongatis parce paraphysatis.

immersa, in pedicello brevissimo curvulo erecta, ovali-oblonga, basi truncata, tenui-membranacea, sicca lævis; annulo lato fragmentarie secedente; peristomii dentibus sedecem lanceolatis purpureis apice irregulariter 2–3-fissis, inferne cribrosis; operculo e basi depresso-conica rostellato; calyptra mitraaformi multoties plicata infra capsular medium descendente; vaginula apice breviter fimbriata.

On rocks near San Marcos, Texas, Wright. Santa Fe, New Mexico, Fendler.

The only known congener of this species is the European C. pulvinatus, in which the capsule is obovate and emergent, with a very large operculum and a simple and narrow annulus: