REPORT ON THE GASTEROPODA. 447 



Shell. — Globose, with a rather high spire and a somewhat elongated and pointed base, 

 thin, with a delicate light-green epidermis ; umbilicus closed. Sculpture: Longitudinals — 

 the lines of growth are fine, hair-like, close-set strise. Spirals — the surface is somewhat dis- 

 tinctly, though finely, scored with shallow furrows and faint lines, which are microscopi- 

 cally crimped ; below the suture the whorls are compressed by a broad very shallow furrow, 

 the lower side of which is very doubtfully angulated. Colour porcellanous white under 

 the delicate, slightly glossy epidermis, which is pale green, streaked on the lines of growth 

 with darker green ; the umbilical pad, pillar, and inside are dead white. Epidermis is a 

 thin, rather persistent smooth membrane. Spire is rather high and conical. Apex rather 

 large, raised so that the extreme tip projects, but rounded though not flattened. Whorls 

 G (of which the first 1^ are embryonic) ; they are scarcely rounded between one suture 

 and the next, with a slight and narrow margin below the suture, then very slightly 

 compressed ; the last is very large and tumid in proportion to the rest, which project very 

 little above it ; they are of slow and very regular increase to the last, which quite swallows 

 up all the others. Suture nearly horizontal, small, not at all impressed, but very distinct, 

 being slightly channelled, and being defined by the small margin and compression of the 

 whorl below it. Mouth large but not very open, semicircular,- oblique, almost right- 

 angled above, rounded below ; the swell of the body- whorl is just perceptible within ; 

 its height is more than seven-ninths of the whole height. Outer lip very regular all the 

 way round, its edge is thin. Inner Up a little flexuous ; the upper corner of the mouth 

 is filled up with a thinnish but broad pad, whose edge crosses the body in a slightly 

 concave line ; below the umbilicus, which it completely covers, it is contracted in on the 

 pillar, which is reverted and thickish, but bevelled to a narrow rounded edge. Operculum 

 testaceous, scored with slightish radiating lines ; the spire is membranaceous, being 

 left uncovered by the limy coat ; but the one specimen which preserves the operculum 

 is a young shell. H. 0'9 in. B. 075. Penultimate whorl, height 0*1 9. Mouth, 

 height 073, breadth 0-52. 



This species so closely approaches Natica affmis, Gm. (= Natica clausa, Brod. and Sow.), that 

 I have hesitated very much to separate them, and have been glad to he strengthened in so doing by 

 the opinion of Prof. v. Martens and of Mr E. A Smith, Natica fartilis is more globose, higher in 

 the spire, longer and more pointed in the base, and less obliquely transverse in its outline ; its apex 

 is larger and slightly more prominent. Natica globosa, King, from Magellan, like this in form, is 

 umbilicated, and has a thin operculum. 



19. Natica (Lunatia) grdnlandica, Beck. 



Natica pusilla (not Say), Gould, Inverteb. Massachusetts, 1841, p. 237, fig. 166, and (ed. Binney) 



p. 341, fig. 611 (Lmmtia). 

 „ grdnlandica, Beck in Moller's Index Moll. Grcenl., 1842, p, 7. 



„ alba, Philippi, Abb. und Besch., vol. i. p. 16, pi. i. fig. 13, and {Natica pusilla) vol. ii p. 42, 

 pi. ii. fig. 9. 



