420 -BULLION. 



or discarded it in favour of Utriculus, which has also 

 precedence of Amphisphyra. 



A. Shell cylindrical or pblong, and solid. 

 ft'H' 1. UTRICULUS MAMMirLA^rus^,(Philippi.) N'W 



Sulla mammittata, Phil. Moll. Sic. i. p. 122, t. vii. f. 20. Cylichna, 

 mammillata, F. & H. iii. p. 514, pi. cxiv. c. f. 4. 5. 



SHELL forming a short cylinder, somewhat constricted in the 

 middle, and having the same breadth at each end ; it is semi- 

 transparent and glossy: sculpture, minute and rather slight 

 stria?, which vary in number and contiguity, and in fresh 

 specimens examined under a microscope appear delicately and 

 closely punctate : epidermis inconspicuous : colour clear white : 

 spire truncated, and encircled by a narrow and solid rim ; it 

 is sunk below the level of the apical rim or periomphalus : 

 whorls 2-3 ; the last (as usual in this genus) envelopes all the 

 rest ; the penultimate whorl exhibits the outside rim only ; 

 the innermost is globular, prominent, and turned inwards or 

 inflected, but not reversed : suture deep : mouth narrow above, 

 more contracted in the middle, pear-shaped and wide at the 

 base, which is rounded : outer lip flexuous, curved and folded 

 inwards in the middle ; the upper part projects a little beyond 

 the apex; outer corner rounded; inner corner receding and 

 incurved, so as to make the suture transversely excavated in 

 front : inner lip continuous with the outer lip above, where it 

 is slightly folded on the apex, as well as on the pillar below : 

 pillar short, flattened, and curved: fold indistinct. L. 0*1. 

 B. 0-05. 



HABITAT : Laminarian and coralline zones in the 

 Channel Isles, Devon, and Cornwall; co. Galway 

 (Barlee) ; Turbot bank, co. Antrim (Waller) ; Hebrides 

 and west coast of Scotland (J. G. J. and others) ; 

 Dunbar (Brown) ; Aberdeenshire (Macgillivray and 

 Dawson) ; Shetland (Barlee and J, G. J.) . Fossil at 

 Dalmuir (Crosskey) ; post-glacial beds in Norway, 

 30-50 feet (Sars) ; Bordeaux (Cantraine) ; Sicily 

 (Philippi and Calcara) . Recent : Grip, Finmark, in 

 * Furnished with a nipple ; not a classical word. 



