1870. ] LANKESTER—NEWER TERTIARIES OF SUFFOLK. 501 
as Nassa conglobata, on account of the deceptive appearance of its 
internal cast (a specimen is thus named in the British Museum). 
Mr. Searles Wood’s Pyrula acclinis is shown, by the impression 
taken from the concave cast of similar specimens, not to have a more 
elevated apex than P. reticulata, a character which he was led to 
attribute to it from the deceptive appearance of the internal cast. 
The specimens of the box-stones and gutta-percha impressions have 
been placed in the museum of the Society. 
The additional facts which I have gathered relative to these 
nodules since 1867 tend to confirm the conclusion then maintained, 
viz. that they are of Diestien age, 2. ¢. approximately equivalents of 
the so-called Black Crag of Antwerp. It also appears very probable 
that they are of the same age as the Lenham sandstones, which they 
rasemble most closely in condition and contents. 
The box-stones of the Suffolk bone-bed represent a period sepa- 
rated by a wide gap from the Red and Coralline Crags, between which 
and the latter, or true-crag period, the numerous ziphioid and other 
cetaceans, the great sharks and Z'richecodon, had passed away; a few 
of the mollusca, such as Voluta, Pyrula, and Cassidaria, compara- 
tively abundant in these nodules, still lingered on into the Coralline 
and Red-Crag period, but attained a larger size, recalling the fact 
observed with living mollusca, that northern specimens of a species 
are larger than those from more southern regions. 
The most important organic remains which I have found in the 
Suffolk box-stones, or with the sandstone adherent, may be now men- 
tioned ; a list is given below. Mr. Baker, of Woodbridge, has the lett 
upper penultimate molar of a Trilophodont Mastodon with this sand- 
stone adherent. Teeth of Ziphioids and fragments of cetacean bone 
are also found included in this way. The largest tooth of Carcharo- 
don which I have seen from Suffolk is one which I obtained from 
a “digeer,” and has the box-stone matrix adherent. Pectunculus 
glycimeris is the most abundant mollusk, and next to that Jsocardia 
lunulata (Plate XXXIV. fig. 10), the casts of which I have compared 
with casts from Antwerp specimens. It will be remembered that 
Lsocardia, though very rare indeed in the English crags, is an abun- 
dant shell in the Antwerp Diestien beds. Pyrula reticulata is by no 
means uncommon amongst the Gasteropods, far more abundant than 
in the English Crags. ‘Two specimens of a Conus, identified by Mr. 
Searles Wood with Conus Diyjardinti, one found by the late Mr. 
Acton, the other by the Rev. H. Canham (Plate XXXIV. fig. 5), are 
the most distinctive mollusks yet obtained in the nodules. Alto- 
gether about 36 species of organic remains haye been found at pre- 
sent in the box-stones; though I cannot say that all these species 
have been satisfactorily identified. The specimens are placed in the 
Society’s cabinet, and through their further e-amnson it will be 
possible to fill in the list more completely. 
In the collection of Mr. Whincopp is a crocodilian scute imbedded 
in this sandstone; it is clearly of Kocene age, and shows that the 
destruction of Eocene strata and admixture of their contents had 
commenced at this period of the history of the East-Anglian area, 
