Shell belonging to the group of C. palmeri Dall and C. eximium Reeve of the western coast of America. Shell depressed conic with a rather acute apex and six whorls ; nucleus white, delicately sculptured ; remainder of shell whitish with faint streaks of brown transverse to the whorls, arranged so as to present the appearance of seven brownish streaks radiating from the apex ; other dots and streaks of brown irregularly distributed ; upper side of whorls with one smooth revolving keel nearly midway between the sutures, but a little nearer the periphery ; this gives the whorls a somewhat tabulated aspect ; above this on the last whorl are four smaller more or less beaded or crenulated keels, below it are two without nodosities, reaching the gently rounded periphery ; between these are intercalary threads or grooves ; base supplied with nine rounded revolving ribs, those nearer the umbilicus with a tendency to beading ; interspaces about as wide as the ribs, which are crossed by slight elevations due to lines of growth ; umbilicus perforate, bordered by a strong white rib, inner walls smooth or transversely striate ; pillar emarginate, twisted, not thickened, ending in a rounded lump above the basal margin of the aperture ; the latter oblique, subrectangular, nacreous, sharpedged, crenulated by the ribs. Operculum as usual in the genus. Alt 7.0. mm; Basal diam. 7.0. mm; Diam. of aperture, 4.0 mm; of umbilicus, 1,0 mm.

Calliostoma yucatecanum Dall, 1881 Depressed Topsnail
Distribution: North Carolina to Texas; Mexico. Size: 16 mm.
Description: Color faded pink with irregular patches of tan on spiral cords; shape trochoid; sculpture of convex whorls, early whorls beaded and becoming smooth on body whorl; microscopic spiral threads in between beaded spiral ribs; spire low; umbilicus deep; suture distinct; numerous fine spiral threads below periphery and over base. Habitat: Common at depths from 10 to 70 m (33 to 233 ft). Remarks: Specimen in photograph from Garcia collection. The species is first listed in Dall s Blake Report (1889), collected in the Yucatan channel at about 1152 m (3840 ft). That depth is questionable, as most records give 9 to 63 m (30 to 210 ft) as its depth range. Records for Texas are from Smith (1958) and Abbott (1974). See Clench and Turner (I960); Quinn (1992).
Synonym: C. agalma Schwengel, 1942.

Habitat. Yucatan Strait, in 640 fms. U. S. Fish Commission Stations 2605, 2608, 2615, and 2619, off the coast of North Carolina, in the warm area, in 15-32 fms., sand; bottom temperature 78° to 80°.0 F.