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aperture, with 7 spiral rows of beads on rounded lirae, and a row of stronger ones, bordering 

 the umbilicus. Moreover the whole last whorl is covered with irregular radiating wrinkles or 

 riblets, instead of the regular ribs on the upper whorls, these ribs are especially conspicuous 

 and more regular on the base, except towards the periphery where they form thinner, irregular 

 wrinkles. Umbilicus pervious, funnel-shaped, its walls with strong wrinkles. Aperture rhombic, 

 its upper margin regularly convex, not very thin, thickened interiorly, separated from the basal 

 margin by a groove, corresponding to the keel, basal margin convex, crenulated, thickened 

 interiorly. Columellar margin rather thick, concave in its upper part, terminating in a sort 

 of tooth below. Parietal wall covered by a thick layer of enamel, thickened at its margin and 

 connected to the pillar by a broad, rounded tongueshaped projection, covering part of the 

 umbiHcus, whose largest diameter, from the base of the columella to the opposite side, is about 

 ^j. of the diameter of the shell. 



Operculum thin, horny, many-whorled, concave at the outer side. 



Diam. maj. (without spines of keel) 8, alt. 4Y0; apert. alt. 2, lat. 3"'/^ Mill. 



This is a beautiful, peculiar shell, quite unlike to anything I know. 



The radula has the teeth in about 48 rows. The rhachidian tooth (R) has a rounded 

 body, with crooked hooks at the angles of the very concave posterior margin, and is thickened 

 by a plate of a triangular shape, with concave sides, the cusp is considerably narrower than 

 the body, which is large in front; it has a sharp point and a few small denticles on each 

 side; the body of the first lateral tooth (i) is larger, subquadrate, with a sharply pointed cusp 

 and a few smaller denticles, the second one (2) has a similar, but more elongated shape and a 

 sharper cusp, also with a few smaller denticles; the third lateral (3) is long and slender, strongly 

 hooked, with denticles at the base of the cusp, and resembles more the uncini; of the uncini the 

 outer ones have a toothed margin, the outermost is broader with many small denticles (U). I think 

 most if not all the uncini, will be more or less denticulated, if seen in a favorable position. 



2. Solariellopsis limbifera n. sp. PL IV, fig. 3. 



Stat. 95. 5°43'.5 N., 119° 40' E. 522 M. Stony bottom, i Spec. 



Shell moderately depressed, conical, slightly convex below, with a very strong, rounded 

 keel, widely umbilicate, yellowish-white, whorls 6^0; nucleus smooth, upper whorls with concentric 

 ribs and traces of one or two spiral lirae, producing small tubercles on the ribs; whorls flattened 

 near the suture, above the upper row of tubercles, this depression is roughened by small lamellae ; 

 lower part of the whorls slightly convex. On the lower whorls, the sculpture consists of a row 

 of rather strong tubercles, at some distance from the suture, the flattened space between suture 

 and tubercles is also lamelliferous ; a second row of smaller tubercles makes its appearance, 

 and becomes more conspicuous on the last whorl; at some distance from the lower suture, a 

 spiral rib, with inconspicuous beads, is crossed by irregular, waved lamellae, which spread on 

 the large keel, which is flat above, rounded at its periphery, and adorned by sharp, compressed 

 folds, which make it crenulated. Base sculptured by five beaded spirals, of which the outer one, 

 placed at some distance from the margin, and the most central one, bordering the umbilicus are 



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