260 EEV. R. BOOG WATSON ON THE 



deep, narrowed by the overspread of the pillar-lip and by the 

 strong, twisted, umbilical pillar, but helped by the strong furrow 

 above and below this pillar. H. 0-42. B. 03. Penultimate whorl, 

 height 0-13. Mouth, height 03, breadth 0'16. 



This species is very peculiar in the squareness of its outlines, 

 arising from an oblique lateral compression. When the shell is 

 laid on its face a very slight angulation at the middle of the mouth 

 is the only thing which breaks the whole basal profile. It has a 

 slight resemblance to the young of JV. islandica, Gm., especially 

 in the form of the spire ; but is very obviously different, being 

 more compressed, with a much broader and shorter base. 



6. Natica amphiala, n. sp. (a/j^iaXos, sea-girt.) 



St. 169. July 10, 1874. Lat. 37° 34' S., long. 179° 22' E. 

 N.E. from New Zealand. 700 fms. Grrey ooze. Bottom tem- 

 perature 40° E. 



Shell. — Thick, depressedly globose, with a small scalar, rather 

 elevated spire, and a narrow obliquely pointed base ; pale yellow, 

 umbilicated. Sculpture. Longitudinals — there are many fine 

 close-set lines of growth. Spirals — there are a few faint traces 

 of obsolete lines and furrows ; there is a slight angulation round 

 the mouth of the umbilical pore. Colour is slightly brownish 

 yellow, but is pure porcellanous white below the epidermis, which is 

 thin, slightly puckered, smooth, not glossy, persistent. Spire short, 

 but abrupt and scalar. Apex seemingly rather large, but abraded. 

 Whorls 4-5, narrow, flatly rounded, of gradual increase to the last, 

 which is disproportionately large, especially toward the mouth. 

 Suture strong, slightly channelled, almost quite horizontal. Mouth 

 large, oval, very little oblique, and rather straight, scarcely pointed 

 above ; it is more than two thirds of the whole height. Outer 

 Up sharp, but strong, patulous throughout. Inner lip straightish, 

 but slightly concave in its whole length ; it is expanded on the 

 labial callus, which is thick, but has no labial nor umbilical pad ; 

 the front of the pillar is thickened and flattened back on the very 

 indistinct circumumbilical carina. Umbilicus is a rather coarse, 

 pervious, smallish round hole, hardly encroached on at all by the 

 inner lip. Operculum membranaceous, thinnish, of a yellow colour, 

 with a dark-maroon outer edge which does not quite coil in to the 

 centre. H. 0'27. B. 025. Penultimate whorl, height 0-07. 

 Mouth, height 021, breadth 0-17. 



This species combines a flattened globose form with a pro- 



