VOtAJTOPSIS. 119 



N. NORVEGICA, Chemn. PL 48, figs. 276, 277 ; PL 49, figs. 278, 



279; PL 50, fig. 288. 



Whorls smooth, polished, sometimes veiy faintly striate ; pink- 

 ish cream color or white. Length, 3-4-25 inches. 



North Sea Coast of England ; Shetland Is.; Greenland; Iceland; 

 Newfoundland ; Norway (100 fathoms) ; Sea of Okhotsk; Alaska. 



The animal has a pale orange or yellowish white body, irregu- 

 larly streaked with purple. " The egg-cases are solitary. Each 

 forms a compressed hemisphere about one inch in diameter, 

 dirty lemon color, semi-transparent, and attached by the whole 

 of its base to the inside of old bivalve shells and other flat sub- 

 stances, and edged by a rim or strip of membrane. The upper 

 surface is covered with a thin whitish crust, which breaks up 

 into crystalline particles and is finely corrugated ; the under side 

 is 'satiny. Ova pink or bright flesh-color. There are in each 

 capsule from two to four perfect fry, which make their escape 

 through a slit in the rim. The shell has the expressive name of 

 ' wide mouth ' among the North-country fishermen."* 



Occurs fossil in the glacial shell mounds at Udevalla ; and in 

 England in the Norwich Crag. At the former locality the spire 

 is somewhat longer, approaching the next species. 



N. Largillierti, Petit, from Newfoundland (fig. 278), is con- 

 sidered by its author a synonym of this species ; nevertheless 

 Kobelt has figured and described a specimen (fig. 279) which 

 differs still more than Petit's type from the normal Norvegica, 

 and which he thinks is distinct ; it approaches the next species 

 in form. 



I can scarcely doubt the identity with this species of N. regu- 

 laris, Dall (fig. 271), which, by a curious error, was described as 

 a var. of N. Beringii, Midd., supposed by him to be equivalent, 

 or nearly so, to N. Norvegica. It comes from Unalashka, etc., 

 and appears to be a stunted form. 



N. TURTONI, Bean. PL 48, fig. 275 ; PL 49, figs. 281-283. 



Shell whitish, spirally striated. Length, 3-5-4- 7 5 inches. 

 North Sea, JSnglish and Norwegian Coasts, 



coralline zone to 100 fathoms. 

 Animal white with purple markings. 



* Jeffreys Brit. Conch., IV, 331. 



