fusus. 331 



(specimens from Vadso being very large) ; Iceland 

 (Steenstrup) ; sea of Okhotsk (Middendoff) . The Ud- 

 devalla form (F. LargilUerti, Petit) has been recorded 

 from Newfoundland by Petit on the authority of M. 

 Largilliert, and from Greenland by Morch on the autho- 

 rity of Herr Jorgensen. 



The egg-cases were first noticed by Professor King, 

 and figured by Mr. Howse. They are solitary. Each 

 forms a compressed hemisphere, measuring about an inch 

 in diameter; it is of a dirty leinoncolour, semitransparent, 

 attached by the whole of its base to the inside of old 

 bivalve shells and other flat substances, and edged by a 

 rim or strip of membrane. The upper surface is covered 

 with a thin whitish crust, which breaks up into crystal- 

 line particles, and it is finely corrugated ; the underside 

 is satiny. Ova pink or bright neshcolour. 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. 



It is the type of Morch's subgenus Volutopsius, and 

 of Gray's genus Strombella. 



3. F. Turto'ni* Bean. 



F. Ttirtoni, Bean in Mag. N. H. viii. p. 493, f. 61 ; F. & H. iii. p. 431, 

 pi. cv. f. 3, 4, and cvi. f. 2-4. 



Body white, with purple markings (Howse) : odontophore 

 having a small plain oblong rhachis without any cusp ; pleura) 

 irregularly triangular, the base broad and straight, inner side 

 sloping outwards, outer fang shaped like a canine tooth, inner 

 fang short and cloven. 



Shell of an elegant shape (not unlike that of F. antiquus, 

 monstr. acuminatum, but having a much shorter and straight 

 canal and a shallower suture), rather solid, nearly opaque, 



* Named in honour of Dr. Turton. 



