UTRICULUS. 419 



C. striata {Bulla striata, Brown) =jB. insculpta, 

 Totten = iL Reinhardi, (Holboll) W6llev= C. propinqua, 

 Sars, is one of the Clyde-bed fossils ; but it does not 

 now exist in our seas. The late Mr. Thompson of 

 Belfast erroneously noticed this arctic species as found 

 at Bangor, co. Down, by Mr. Hyndman. It inhabits 

 the eastern coasts of North America, Greenland, and 

 Finmark. 



Genus II. UTRI'CULUS* Brown. PL VIII. f. 2. 



Body containable within the shell : mantle slightly thickened 

 at the edges : head broad : tentacles separate and triangular : 

 eyes minute, placed at the base of the tentacles : foot oblong 

 or oval, shorter than the shell, more or less divided or bilobed 

 behind : [odontophore, according to Loven's description of that 

 organ in his Amphisphyra globosa, having the rhachis broad 

 and nearly rectangular, with the cutting-point transverse and 

 jagged ; the uncinus is single, claw-shaped, slender, expanded 

 at the base, and winged outside :] gizzard small, horny. 



Shell altogether external, forming a short cylinder, or 

 globular : spire exposed, mostly truncated : whorls angulated 

 or keeled, the first being nipple-shaped : mouth usually ex- 

 tending the whole length of the shell, narrow at the upper 

 part, and expanding in front : pillar furnished at the base 

 with a small fold or plait : operculum none. 



This genus differs from Cylichna in the tentacles 

 being separate, eyes distinct, gizzard horny, and the 

 shell having a visible spire with a mammillar apex. It 

 is the Bullina of Risso and De Blainville, and perhaps 

 of Ferussac also ; but that name has been appropriated 

 to another genus allied to Aplustrum. I regard Am- 

 phisphyra of Loven as a synonym of the present genus. 

 Brown had many years previously proposed the objec- 

 tionable name Diaphana ; but he afterwards cancelled 



* A husk of grain. 



