Genus Gadinia, Gray.

Shell conical, with a slight internal siphonal groove in front of the right side of the muscular impression. Head distinct; tentacles, expanded funnelshaped; pulmonary cavity with a gill placed obliquely across the back of the neck. Jaw none. Radula rather short, teeth quadrate, arranged in angled transverse rows.

Gadinia nivea. Plate XVII., figs. s. to v.

Gadinia nivea, Hutton, Jour. de Conchyliologie, 1878, p. 36.

Stell ovate, depressed, white, with about forty radiating ribs; apex rather posterior, slightly uncinate.

Length .75 or .8, breadth .7, height .15 to .2.

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Dentition, 60—1—60/150., transverse rows forming an angle of about 90°, reentrant anteriorly. Jaw none. Central tooth with the reflexed portion somewhat rectangular with four minute denticles on the oblique posterior edge. Laterals about twenty-one, each with a long pointed cutting-point and a small denticle on the inner side. Marginals with a long median cutting-point and two small denticles on each side.

Animal probably white, but the only specimen I have had, had been for some time in spirit and was not in good condition. Buccal mass very large and oval; œsophagus short and as broad as the stomach, which turns sharply to the right and passes gradually into the intestine. The intestine passes backward, then curves to the left, then forward and to the right passing over the pylorie end of the stomach, it then makes a complete circle forward and to the left, and then passes straight to the anus which is on the right side of the head. The reproductive orifice is situated between the anus and the mouth. The penis is long, narrow, and straight, lying