258 KEV. E. BOOG WATSON ON THE 



of growth. Spirals — there are a good many faint flexuous lines, 

 and very obsolete but broader furrows. Colour apparently yel- 

 lowish white, but there is a very persistent, dull ruddyish-brown 

 epidermis, in which there are narrow longitudinal lines of lighter 

 and darker shade. Spire high and scalar, each whorl rising high 

 out of the one below. Apex quite worn away in both specimens. 

 Whorls 4§, tumid, large from the beginning and of slow increase. 

 Suture not very oblique, channelled. Mouth very slightly oblique 

 to the axis, semicircular, but a little slewed, so as to be very 

 slightly pointed above, and unduly bulging below beyond the point 

 of the pillar ; it is two thirds of the total height of the shell. Outer 

 lip retreats somewhat on leaving the body-whorl, and at this part 

 is slightly contracted, but below this it is open and its curve is 

 very regular ; there is a very faint tendency to angulation on the 

 base ; its edge is narrow and sharp. Inner lip straight till it 

 strikes the base of the shell, where it curves with a full rounded 

 sweep to the right ; it is carried across the body on a thickish, 

 prominent, reverted layer, crosses the umbilicus with a thin re- 

 verted edge, which half covers the opening, and is thickened and 

 rounded, with a narrowed edge at the point of the pillar. Um- 

 bilicus is a funnel-shaped opening, very much contracted and con- 

 cealed by the reverted pillar-lip. H. 0'7. B. - 63. Penultimate 

 whorl, height 0-22. Mouth, height 0-47, breadth 0-38, 



This species has so strongly the aspect of Natica islandica, Gkn. 

 ( = helicoides, Johnston, =canalieulata, Grd., = cornea, Mtiller, out 

 of which and the two latter synonyms Messrs. Adams form their 

 genus (=M6rch's subgenus) Amauropsis, characterizing it by a 

 feature which the species has not, viz. the absence of an um- 

 bilicus), that I can easily believe connecting links will yet es- 

 tablish their identity. The age of iV. islandica and its distribution, 

 as well as its present habitat in Subarctic and Arctic seas, make 

 its presence in Antarctic regions more probable. But for the 

 present it is impossible to unite them. ~N~. suturalis has an epi- 

 dermis which, though minutely marked Very much like that of 

 N. islandica, is coarser, darker-coloured, and more fibrous ; the 

 form of the shell is broader ; the spire is lower, less scalar, with a 

 less deeply channelled suture ; the mouth is much rounder and is 

 less pointed below. 



5. Natica iiadiata, n. sp. 



North Atlantic, April or May, 1873. Over 1000 fins, 



