504 
smaller than the recent ones. This, however, may he due to tlio 
practice of selecting unusually large specimens for a museum. 
The two Danuhian species, L. fascus, Zieg. and L. naticnides, Fer. 
are very closely allied, and have apparently been transposed by 
several German writers.* Under the circumstances it does not 
seem perfectly certain to Avhich of the two species our fossil should 
be referred. 
A description of the genus, and a figure of L. fascus (the type of 
the genus) Avill be found in Woodward’s ‘ Mollusca/ but as it is not 
included in any monograph on British recent or fossil shells, the 
generic characters are given below : — 
LUhor/Iyphiis, Megerle. Type L. fiiscus. Shell naticoid, often 
eroded ; Avhorls few, smooth ; aperture large, entire ; peristome 
continuous, outer line sharp, inner lip callous ; umbilicus rimate ; 
epidermis divaceous ; operculum pauci-spiral. 
The Norfolk fossil is semi-globose, thick, solid ; spire short, 
obtuse, whorls 4 ; length 8 mm., breadth G mm. The recent shell 
lives on stones and Avater plants. 
The discovery of this fresh-Avater shell in England, associated Avith 
Corhicida Jluminulis, is of especial interest, as L. fascus is uoav con- 
fined to tlie Danube, and no species of the genus had previously 
been recorded, either living or fossil, north of the Alps. It seems to 
be a fresh instance of a genus, formerly distributed over a Avide area, 
Avhich has noAV become extinct in the intermediate districts. The 
living species inhabit tlie Danube, South America, and, according to 
Woodward, Oregon ; the only extinct form of Avhich I have been 
able to find any record is also from the Danubian basin. 
* See Spiridion Brusina, Fossile Binnen — ‘ Mollusken aus Dalmatien 
Kroatien und Slavonien,’ p. G7. 
