. REPORT ON THE GASTEROPODA. 437 



impressed, but not channelled. Mouth very small for the genus, very oblique, semi- 

 circular, but reduced by the large superior labial pad to a flat-sided oval ; deep but uot open ; 

 its height is less than three-fourths that of the whole shell. Outer lip narrow, but strong ; 

 it rises a very little at its junction with the body, retreats a good deal throughout its 

 whole very equable sweep, till on the base towards the point of the pillar it very slightly 

 advances, and there alone is a very little patulous. Inner Up oblique, very slightly con- 

 cave ; on the body it is formed by a large porcellauous white, pad projecting in a rounded 

 knob, between which and the sharp edge of the outer lip is a small shallow depression ; 

 retreating and becoming thinner on the body this pad projects prominently across the 

 shell above the umbilicus, which it somewhat covers, but a furrow above the umbilical 

 pillar cuts in on it ; it spreads out in a half-circle on the point of this umbilical pillar ; 

 below this point another umbilical furrow cuts still deeper into it, but toward the point of 

 the pillar it is broadened and reverted on the thickening of the slight circum-umbilical 

 carination. Umbilicus strong and 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. 0-3. 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 com- 

 pression. 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 

 Natica islandica, Gm., especially in the form of the spire ; but is very obviously different, being more 

 compressed, with a much broader and shorter base. 



9. Natica amphiala, 1 Watson (PI. XXVII. fig. 6). 



Natica amphiala, Watson, Prelim. Report, pt. 7, Journ. Linn. Soc. Lond., vol. xv. p. 260. 



Station 169. July 10, 1874. Lat. 37° 34' S., long. 179° 22' E. North-east from New 

 Zealand. 700 fathoms. Blue mud. Bottom temperature 40° Fahr. 



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 dispro- 

 portionately lnrge, especially toward the mouth. Suture strong, slightly channelled, 



1 afirj)ia>.oc, sea-girt. 



