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On some new Species of Hemipedina from the Oolites. 
' By Tuomas Wricut, M.D., F.R.S.E. 
Since the publication of our paper in the August Number of 
the ‘Annals and Magazine of Natural History,’ on the new 
genus Hemipedina and the Synopsis of the species included 
therein, our friend S. P. Woodward, Esq., has kindly sent us 
three new English forms of this group, one found in the cal- 
careous grit of Berkshire, and two in the Kimmeridge clay of 
Bucks ; our friend Thomas Davidson, Esq., has hkewise com- 
municated a figure of one found by M. Bouchard Chantereaux 
some years ago in the Kimmeridge clay of Boulogne-sur-Mer ; 
we lose no time therefore in recording these additions to the 
Oolitic fauna, at the same time returning our hearty thanks 
to the kind friends who have so liberally communicated the 
specimens. 
A. Species from the Calcareous Grit. 
Hemipedina Marchamensis, Wright, nov. sp. 
Test large, and depressed ; ambulacral areas narrow, with two 
rows of marginal tubercles, nearly as large as those of the 
interambulacra, extending regularly and without interruption 
from the peristome to the apical disc, and separated by a zig- 
zag line of small granules down the centre, the areas retain- 
ing a nearly uniform width throughout ; poriferous zones form 
a slightly waved line, from every three pairs of pores being set 
slightly oblique to the line of the zones ; interambulacral areas 
four times the width of the ambulacral, with eight rows of 
tubercles at the equator, each tubercular plate supporting 
four nearly equal-sized tubercles abreast ; bosses prominent ; 
areolas surrounded with incomplete circlets of small granules ; 
mouth-opening less than one-third the diameter of the test ; 
peristome unequally decagonal ; five jaws, in situ, each jaw 
having two broad flat central ridges, and two oblique mar- 
ginal ridges with two intervening depressions ; teeth long, and 
obliquely truncated at the points. 
Dimensions.—Transverse diameter 2,9, inches; height 1,3; 
inch ? 
Locality.—The calcareous grit of Marcham, Berks. 
Coll. The Hon. R. Marsham. 
