GEMS OF rUlVATK COLLECTIONS. 
449 
tho weald clay of Sussex is named P. Sussexiensis by Sowcrby, 
in tho Geol. Transact., 2 ser., vol. iv., p. 178, pi. 22, fig. G. 
Other Paludina, but of smaller size, fire found in the wcaldcn beds, 
namely, P. car'mifem, (Sow. Min. Conch., ])1. 509, fig. 3 ; and Geol. 
Trans , 2 ser., vol. iv., p. 178) ; and P. elmigafa, (Sow. Min. Conch., 
pi. 509, fig. 2.) Fig. 1, of the same plate, shows a similar Paludina for 
East Peckham. 
The Uniones of the Sussex marble appear to be Unio compressus, 
(Sow. Min. Conch., pi. 594., fig. I, and If. antiqnu.s, Sow. Min. Conch, 
pi. 594, figs. 3, 4, 5. The specimen figured in our plate (pi. xiv.), is 
probably the latter. 
The other Wealdeu TJnioa are Unio aduncus, (Sow. M. C, pi. 695, 
fig. 2); If. cordiformis, (Sow., M. C, pi. 595, fig. 1); U. porrectus, 
(Sow., M. C, pi. 594, fig. 1) ; U. Valdensis, (Sow., M. C, pi. 646) ; 
U. Mantellii, (Sow., Geol. Trans., 2 ser., vol. iv., pi. 21, fig. 14) ; 
U. sulitruncatus, (Sow., ibid. fig. 15) ; Z7. Gaulterii, (Sow., ihid., fig. 
16; and U. Martini, (Sow., ibid., fig. 17.) Several of these are from 
the sandy beds far below the weald clay, that is, in the Hastings 
sands and their associated beds. 
The Betliersdeu Marble used to be very extensively for build- 
ing, and for making long narrow causeways along the wet and muddy 
roads of tlie wealds of Kent, Sussex, and Surry ; but in both respects 
it is now less used. There is an account of this stone and its localities 
by Dr. GviW Hartley, entitled, " On Fossil shells in Kent/' to be 
found in Mr. Lowthorp's Abridgment of the Philosophical Transac- 
tions, 4th Edit., vol., vi, p. 426. This old-fashioned philosopher refers 
to the Paludina bed in the blue clay " at Hinton, five miles from 
Maidstone, in Kent ;" and at " Pluckley, in the wild of Kent." 
At the former place, Unios, (or, as they are termed, " bivalvular 
stones,") appear to be rather numerous (as they were, indeed, near 
Pluckley and Bethersden) ; but the " turbinated," or " wreathed 
conchites," formed the majority. We may remark that Dr. G. Hartley, 
according to the mode of the day, found good reasons " for their never 
having been the spoils of animals but stones (" lapides sni generis"), 
formed, perhaps, of " the salts of plants or animal bodies, washed down 
with rain, and lodged under ground," and " disposed into such little 
figTires !" 
T. R. J. 
VOL. III. 3 L 
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