i6 



Shell Life 



globose shell of rather handsome appearance, pale buff- 

 coloured and polished, the upper side of the whorls 

 ornamented with a series of dark red 

 or violet zigzag or V-shaped marks. 

 The epidermis is retained only within 

 the umbilicus. There are 7 whorls and 

 a large deep umbilicus. Tlie operculum 

 Large Necklace-shell \^ hom-coloured. The slicll Ordinarily 



(one-fourth nat. size) i i • i i i i ii • 



measures 1;^ inch each way, but this 

 is often increased to 2 inches. It is tolerably 

 common, between extreme low water and a depth 

 of 10 fathoinSj from the south of 

 End and to the north of Scotland. 

 The Sordid Necklace-shell (iV. «or- 

 dida^ is similar to the last named, 

 but somewhat smaller and more 

 deeply, less clearly coloured, more 

 oval — longer than broad — and 

 thicker, without the markings. The 

 whorls are 5 or 6. The horn- 

 coloured operculum edged with 

 white. It frequents sand}^ shores 

 of a somewhat muddy character in 

 from 7 to 90 fathoms, from Shetland to Scilly, but 

 is more local than N. catena, and the individuals far 

 less numerous. 



The Greenland Necklace-shell {N. gra^nlandica) is 

 thinner, almost semi-transparent, without gloss, 

 white, with a cream-coloured epidermis ; whorls 4 or 5. 

 The umbilicus is narrow, and the operculum thin, 

 lemon coloured. Its measurement is less than 1 inch 

 either way. It is a deep-water species, and is dredged 

 from muddy ground in from 40 to 50 fathoms in 



Life aspect of N. cateva 



