372 BULLETIN OF THE 



and pointed behind. The epipodiuni has a very large anterior lobe reaching to 

 the base of tlie tentacles, and four long cirri diminishing backward, set at 

 regular intervals, two being under the shadow of the operculum; the posterior 

 part has no cirri. The muzzle is long, widened and papillose at its extremity 

 which seems as if it might expand into a sort of tube in front of the jaws, 

 which are black. There are no epipodial lobes between the tentacles. The 

 animal recalls that of Eutrochus cinctellus, but is larger. 



Calliostoma (Eutrochus) cinctellum n. s. 



Plate XXXII. Figs. 1, 4. 



Shell small, thin, pearly white with faint touches of pale brown, seven- 

 whorled, with a globular inverted minute nucleus and rather convex base; 

 spiral sculpture of two prominent spirals, one peripheral, simple, sharp, with 

 occasional touches of brown ; against this the suture is laid in the earlier 

 whorls, while in the last whorl it descends below it; the other spiral is above 

 the periphery, and is stronger and ornamented with (on the last whorl) about 

 forty sharp projecting thorn-like tubercles, each inclined a little forward, and 

 alternating brown and white. Between this and the periphery the space is 

 excavated. Above these there are about four (on the earlier whorls one or two) 

 small raised spiral lines separated by much wider interspaces, nodulated with 

 small but prominent nodules at the intersections with the radiating sculpture; 

 all the sculpture growing fainter, and intercalary fine lines appearing, toward 

 the aperture on the last whorl. Base with two strong nodulous spirals sepa- 

 rated by a deep interspace, the inner one forming the umbilical margin; outside 

 of these 16-20 fine flattened spiral threads, with about equal interspaces, reach- 

 ing to the periphery and hardly ruffled by the incremental lines. Radiating 

 sculpture much like that of C. tiara, of numerous, on the early whorls strong, 

 slightly elevated oblique threads, extending clear across the whorls and reticu- 

 lating the spirals; these radii grow fainter and finally on the last whorl nearly 

 disappear; on the base there are only faint flexuous Incremental lines. Um- 

 bilicus narrow, its walls flexuous, yellow. Aperture squarish, the pillar little 

 concave, not toothed, margin thin and simple. Upper surface of whorls ex- 

 cept the sculpture flattened; suture distinct, not channelled. Operculum horny, 

 multispiral. Alt. of shell, 9.5; of spire above the aperture, 6.5; max. diam. of 

 base, 8.0; min. diam., 7.0 mm. 



Soft parts whitish, foot short, pointed behind, muzzle rounded, gill single, 

 anus prolonged into along free papilla, eyes large; tentacles long and stout, 

 without frontal lobes; epipodium with a large anterior lobe, and four cirri all 

 anterior to the operculum and about of equal size. Jaws separate, squarish, 

 composed of small horny obliquely set rods, whose lo-zenge-shaped end-sections 

 reticulate the surface under the microscope. 



The dentition is peculiar. The rhachidian and (on each side) five laterals 

 have broad simple bases with a pear-shaped outline; the cusps, which might be 



