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varieties of them at Grignon, was much disposed to place them under 
the same genus, until he adverted to the circumstance of the spiral turns 
in these shells being contiguous, whilst in Spirula they are separate. 
They in general form one or two spiral turns in a horizontal direc- 
tion, and then become elongated in a straight line. In some species 
there is only a little curvature, instead of the spiral turns ; and, in 
others, the whole shell is entirely straight. Some have their spiral 
turns flattened, others have them cylindrical ; but the chambers in all 
form some degree of projection externally which gives the shell the 
appearance of being divided by transverse ridges. May not the 
straight species be the ^Nautilus radicula of IVIontague ? Plate XL 
Fig. 8 and 9, represent the different species particularized by Lamarck; 
S. depressa and S. cylindracea, Fig. 10, being supposed to be a 
variety of S. cylindracea, Fig. 9. 
LXXXIX. Miliola. A transverse, ovato-globose or elongated, 
multilocular univalve, with transverse chambers, involving the axis 
alternately, and in three directions : the opening small and circular, 
or oblong, at the base of the last chamber. 
The frequency of these fossils, in the neighbourhood of Paris, is 
such, that some species of them form the principal part of the masses of 
stone in some of the quarries. Lamarck describes seven species : and 
gives figures of five of these species, which are here copied. These 
figures are considerably magnified, the actual size being about that of 
a grain of sand. Plate XI. Fig. 11, is Miliolites ringens ; Fig. 12 
and 13, are of M. Saxorum ; Fig. 14, 15, and 16, of M. cor anguinum ; 
Fig. 17, 18, and 19, of M. trigonula ; and Fig. 20, of M. opposita. 
The other species mentioned by him are, M. planulata and M. hirostris. 
It is also mentioned by this author, that he possesses recent specimens 
of these animals, which were taken on fucus, near the Island of Corsica. 
Agreeable to this account of Lamarck’s, of these animals having been 
found in a recent state, are the discoveries of the late Mr. Boys and of 
