370 BULLETIN OF THE 



white, minute, globular. (St. Croix, Gov. Rawson. Gulf of Mexico, U. S. 

 Fish Commission.) 



The fossils are not quite equal to the average of recent specimens in size, 

 contrary to the usual rule, but otherwise are identical. The varieties blend in 

 a large series. 



Calliostoma (Eutrochus) yucatecanum Dall. 



Plate XXIV. Figs. 4,4 a. 



Calliostoma yucatecanum Dall, Bull. M. C. Z., IX. p. 47, 1881. 



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. 



Most of the northern specimens are less elevated and proportionally wider 

 than the Blake specimen which has been figured, but which seems to have been 

 a little unusual in its elevation. 



Calliostoma (Eutrochus) Sayanum n. s. 



Plate XXXIII. Fies. 10, 11. 



Shell large, polished, solid, eight-whorled, having a good deal the form of 

 the G. tigris of New Zealand ; umbilicated ; straw-yellow lineated with xed- 

 brown, and having a broad rose-colored peripheral band. Walls of umbilicus 

 marked with incremental lines, slightly excavated near the carina, above con- 

 vex, the convexity revolving with the whorl; convexity straw-color, a deep 

 brown band revolving just within the carina. Spiral sculpture outside the 

 carina, which is not very sharp, consisting of two strong beaded spirals alter- 

 nating with two fine simple brown elevated lines, then nine subequal, finer, 

 less coarsely beaded, the upper angle of the aperture being at the ninth; all 

 these straw-color with brown interspaces; then three fine yellow-brown un- 

 dulated lines, then a larger nodulated peripheral spiral with a smaller similar 

 one on each side of it, these and their interspaces of a deep rose-pink; above 

 the pink band is the largest nodulated spiral, followed by (on the last whorl) 

 seven or eight somewhat smaller, alternating larger and smaller, the last sepa- 

 rated by a smooth space from the suture. These are all straw-color with 

 brown interspaces and an occasional intercalary fine line. Radiating sculpture 

 only of faint incremental lines. Nucleus lost; the earlier whorls have three 

 nodulated spirals. Base and whorls a little convex, periphery eVenly rounded, 

 sutures distinct. Aperture ovate, margin simple, columella concavely arched, 

 a slight angle, not to be called a tooth, formed by the end of the umbilical 

 carina at the base. Jnterior extremely nacreous. Max. Lit. of base, 40.0; of 

 mouth, 18.0; rnax. alt. of shell, 37.0; of mouth, 10.0 mm. Apical angle about 

 80°. Operculum amber-colored, fibrous toward the edges, with twelve or more 

 whorls, a small central elevation on the inner side. 



