HYALINIA LEIA AND. DAWSONI. 153 
Hyalinia sconciensis (Newton & Harris). 
Helix sconciensis (Edw. Ms.) Gardner, Geol. Mag., 1885, p. 249 [nomen nudum). 
Vitrea sconciensis Newton & Harris, Proc. Mal. Soe., 1894, i., p. 71, pl. 6, £. 13. 
SHELL much depressed, subdiseoidal, and 
umbilicated ; WHORLS five, ornamented with 
numerous closely-set strive, which extend over SSE, 
the whole surface quite to the umbilicus ; f aw 
SUTURE deep; SPIE slightly elevated; LIP aaa 
simple. 
Diam. 9 mill. ; alt. 4 mill. Fic. 207.—H, sconciensis (N. & HL), 
Messrs. Newton & Harris remark that enlarged (after Newton & Harris). 
its nearest ally is Helix @urbani Edwds., which occurs in the same beds, 
but the present species differs in the highly ornate character of the 
striation, more depressed spire, and slightly larger umbilicus. 
BRITISH ISLES. 
Oligocene—In the Bembridge limestone series, Sconce, Isle of Wight. 
- 8 5 ; . 
Hyalinia leia (Newton & Harris). 
Helix leia (Edwards Ms.) Newton, Syst. List Edw. Coll. Brit. Mus., 1891, Y 27( 
Vitrea leia Newton & Harris, Proc. Mal. Soc., Mch. 1894, i., p. 71, ‘pl. vile ie 
SHELL depressed, discoidal, and umbilicated ; 
WHORLS four, regularly increasing, the surface 
polished and showing numerous obscure lines 
of growth ; APEX very obtuse ; APERTURE sub- 
ovate, and extending to the margin of the 
umbilicus, which is small and deep. coma, \ f 
Diam. 6 mill. ; alt. 2°5 mill. Sw 
nagrdine Cap] re ia 1a Fic. 208.—//. deta (N. & H.), enlarged 
According to the describers, this is a Ge Ne & bare) 
small and delicately formed shell, having 
a contour very similar to that of /yalinia cellaria, but differing in its 
much more depressed spire, and it may be added more laterally expanded 
last whorl. Only one specimen is known of this form. 
BRITISH ISLES. 
Oligocene—Headon limestone series, Headon Hill, Isle of Wight. 
Hyalinia dawsoni (Moore). 
Helix dawsoni Moore, Quart. Journ. Geol. Soc., 1867, p. 549, p. xv., f. 12. 
Original Description.—‘‘Shell small; spire but 
slightly elevated, with about four apparently small 
convex volutions, divided by a slight sulens ; the base 
of the shell is slightly crushed, but it is seen to he 
flattened and to possess a deep and rounded umbilicus 
with a rounded aperture.” 
“The somewhat imperfect condition of this shell, 
of which I have but one specimen, renders it rather 
difficult to determine it with precision; but its 
generic determination is facilitated by its being found 
in association in the same deposit with the land and 
freshwater genera I have previously enumerated.” 
Fic. 209.— H. dawsont 
(Moore) enlarged, after Moore 
Mr. Kenneth McKean, who has kindly examined the type specimen in 
the Museum of Bath, reports that the original specimen is less than a 
millimetre in diameter, and secured within. class tubing upon a cement 
into which the shell has partially sunk, but that he could not discern 
markings of any kind upon the smooth surface of the whorls. 
BRITISH ISLES 
Lias—l*ound by Moore in a bed of clay, twelve feet in thickness, at a depth of 
270 feet, in the Charter-House lead mine, Mendip Hills, North Somerset. 
