MONOGRAPH OF BRITISH LAND AND FRESHWATER MOLLUSCA. iol 
FOSSTL SPECIES. 
Hyalinia d’urbani (Edwards). 
Helie @urbani Edwards, Mon. Eoe. Moll., 1852, pt. ii., pp. 62, 63, pl. x., ff. 5 A-D. 
Helix keepingi Edwards Ms., Edwards’ Collection, British Museum. 
Helie omphaloides Edwards MS., Edwards’ Collection, British Museum. 
aes. 
Pe ig. 
t 
“NS 
Hyalinia @urbani Edwards (after Edwards). 
Fic. 199.—Natural size. Fic. 200, 201, and 202.—Lower, upper, and frontal aspects x 2. 
SHELL smooth, depressed and moderately but perspectively umbilicated ; SPIRE 
somewhat raised ; WHORLS about five, convex in the adult, but slightly carinate 
when young; SUTURE somewhat channeled ; APERTURE crescentic; PERISTOME 
simple and direct. Diam, 10 mill. ; alt. 5 mill. 
_— 
A variety occurs in which the spire 
is more depressed, the whorls conse- 
quently assuming a less bluntly 
convex form. 
The smooth and polished surface, 
with faint growth lines and thin 
unreflected lip, prevent its being 
confused with //. vectiensis, which is 
of somewhat similar outline, but 
although not an uncommon species, 
it is generally casts only that are 
found, in which condition the width 
of the umbilicus is almost the only 
character distinguishing it from //, 
rectlensis, 
This species is here associated with 
the distinguished — paleontologist, 
Mv. Frederic E. Edwards, the author 
of the superb Monograph of Eocene 
Mollusca, published many years ago 
by the Paleontographical Society, 
and still the standard work upon 
I S See the subject, 
ile = 
; 77 ae Mr. Edwards named this species 
in honour of the late Mr. J. d’Urban, 
the paleontologist. It is said by its author to somewhat resemble 
HT. lemani of Prof. Brongniart, but the spire is less elevated and the 
umbilicus more open, while Sandberger remarks that though flatter and 
more widely umbilicated, it resembles //elix voltzii from the Upper Hocene 
of Buxweiler in Alsace. 
According to Mr. R. 8. Gardner, the Helix keepingi, H. omphaloides, 
and HH. morrisii of Edwards, may all be appropriately referred to //elia 
d urbani, the two first-named being also so labelled in the British Museum. 
