408 CALLIOSTOMA-EUTROCHUS. 



lineated with red-brown, and having a broad rose-colored peripheral 

 band. Walls of umbilicus marked with incremental lines, slightly 

 excavated near the carina, above convex, 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 alternating 

 with two fine sim|)le brown elevated lines, then nine subequal, finer, 

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

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

 brown undulated lines, then a larger nodulated peripheral spiral 

 wdth a smaller similar one on each side of it, these and their inter- 

 spaces of a deep rose-pink ; above the pink band is the largest nod- 

 ulated spiral, followed by (on the last whorl) seven or eight somewdiat 

 smaller, alternating larger and smaller, the last separated by a 

 smooth space from the suture. These are all straws-color with brown 

 interspaces anfl an occasional intercalary fine line. Radiating 

 sculpture only of faint incremental line.^. 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. 

 Interior extremely nacreous. Operculum amber-colored, fibrous 

 toward the edges, with twelve or more whorls, a small central eleva- 

 tion on the inner side. Alt. 87, diam. 40 mill. (Dall.) 



Off (Jape Hatteras, in 107-120 fms. 



Calliostoma (Eatrochus) smjanum Dall, " Blake " Gasteropoda, p. 

 370, t. 38, f. 10-11. 



Animal with stout rounded muzzle, short stout tentacles, large 

 black eyes, a very large anterior epipodial lobe, two lateral cirri, 

 and two or three small ones from under the operculum. The foot is 

 bluntly rounded before and behind. The color of the external soft 

 part is uniform straw-color. 



This is altogether the finest American species, and cannot be con- 

 founded with any other now known. (Dall.) 



C. BENEDiCTi Dall. PL 49, fig. 44. 



Shell depressed, with an acute apex and slightly concave outline, 

 umbilicated, polished ; strawcoloi-ed, lineated with red-brown and 

 pale pink; base convex, slightly flattened, periphery rounded; 

 nucleus minute, apparently dextral ; whorls seven or more; um- 



