354 
r sely packed, and follow no such definite arrange- 
ee Hi ae peers are ‘simple sacs in both Bipalium and Rhyn- 
chodemus, and are placed very far forwards in the head, a 
long distance from the uterus. In Bipalium, short branches 
given off from the posterior positions of the oviduct are the rudi- 
ments of a ramified ovary, such as exists in Dendrocelum lac- 
teum. The organs described as nervous ganglia by Blanchard 
in Polycladus are almost certainly its testes and ovaries, and 
therefore the arrangement of these bodies in Polycladus is the 
hat in Bipalium. ; 
a The cheat 5 ster is ill defined, but appears to consist of a 
network of fibres ee ganglion-cells, which lies within the 
imitive vascular canals. 
eco eye-spots are presented in Bigalium, most of them 
being grouped in certain regions in the head, but some few being 
found all over the upper surface of the body, even down to the 
tail. In MRhynchodemus two eyes only are present. All grada- 
tions would appear to exist between the simple unicellular eye- 
spot of Bipalinm and the more complex eye of Leptoplana or 
Geodesmus, where the lens is split up into a series of rod-like 
bodies, forming apparently a stage towards the compound eyes 
iculata. é pe 1 
‘i Jone tae the general anatomy of ipalium, it is impos- 
sible to help being struck by the many points of resemblance 
between this animal anda leech. Mr. Herbert Spencer has, in 
his ‘‘ Principles of Biology,” placed a gulf between Planarians 
and leeches by denoting the former as secondary, the latter as 
tertiary aggregates, so called because consisting of a series of 
secondary aggregates formed one behind the other by a process 
of budding. Itis obvious, however, that a single lecch is directly 
comparable to a single Bipalium, The successive pairs of testes, 
the position of the intromittent generative organs, the septa of 
the digestive tract, and most of all, the pair of posterior czca, 
are evidently homologous in the two animals. Further, were 
leeches really tertiary aggregates, the faet would surely come out 
in their development, or at least some indication of the mode of 
their genesis would survive in the development of some annelid. 
Such, however, is not the case. — The young worm or leech is at 
first unsegmented, like a Planarian, and the traces of segmenta- 
tion appear subsequently in it, just as do the protovertebrz in 
vertebrates which Mr. Spencer calls secondary aggregates. If 
Mr. Spencer’s hypothesis was correct, we should expect to find 
at least some Annelid developing its segments in the egg as a 
series of buds. It is not, of course, here meant to be concluded 
that Annelids are not sometimes in a condition of tertiary 
aggregation, as ats certainly is when in a budding condition, 
but that ordinarily they are secondary and not tertiary aggre- 
gates, and if so, then so also are Arthropoda. : 
“Qn a new Locality of Amblygonite, and on Montebrasite, a 
new hydrated Aluminium and Lithium Phosphate.” By M. 
Des Cloizeaux. 
Geological Society, Feb. 5, Warington W. Smyth, F.R.S., 
vice-president, in the chair. The following communication was 
read :—‘*On the Oolites of Northamptonshire.—Part II. 
By Samuel Sharp, F.G.S. In the first part of this memoir the 
succession of beds in the neighbourhood of Northampton was 
shown to be as follows :— 
Clay 
White Limestone 
Clay with Ferruginous Band... 
(‘‘ Upper Estuarine ”) ... 
Line of Unconformity. 
Sand with Plant Bed............ 
(* Lower Estuarine”) ... 
Variable Beds.........sc00--20+ 0+ 
Tronstone Beds .......sssseseeee 
Upper Lias Clay. 
The Great Oolite limestone of this section has been con- 
founded, even up to the present time, with a limestone (frequently 
Oolitic) which occurs between Kettering and Stamford, is pre- 
valent about the latter town, extends through Rutland and Lin- 
colnshire (where it attains a thickness exceeding 200 feet) and 
into Yorkshire, which limestone has been distinguished by Mr, 
Judd as the ‘‘ Lincolnshire limestone.” The object of the author 
was to show that these two limestones were distinct, and that 
while the former was of the Great Oolite period, the latter as 
certainly belonged to the Inferior Oolite ; and in citing evidence 
in proof of this position upon stratigraphical and palzeontological 
grounds, he gave a general account of the geology of the northern 
ment. 
Great Oolite. 
Northampton 
Gand Inferior Oolite. 
anc 
NATURE — 
division of Northamptonshire, illustrating his description by the 
exhibition of numerous fossils gathered from the various beds 
and localities referred to. Between Northampton and Kettering, 
the Great Oolite limestone is the surface rock ; and intersecting 
valleys upon that line, and the escarpment of the Ise valley, a 
mile east of Kettering, exhibic this s€quence of beds :— 
Great Oolite Limestone. 
Upper Estuarine Clays. 
Inferior Oolite ... Lower Estuarine Beds ) Northampton 
33 ... Ferruginous Beds ...... Sand. 
Upper Lias......... Clay. 
And this section, with the successive superaddition of Great 
Oolite, Clay, Cornbrash, Kelloway Rock, and Oxford Clay, is 
continued due east across the country to the Valley of the Nene, 
and on into Huntingdonshire. Upon the same Ise escarpment, 
about a mile north-east of Kettering, the thin end of the wedge 
of the Lincolnshire limestone is seen to come in; and this 
sequence, for the first time, is presented :— 
Great Oolite ...... 
Limestone. 
Upper Estuarine Clays. 
LINCOLNSHIRE LIMESTONE (very thin). 
Lower Estuarine Beds ) Northampton 
Ferruginous Beds .....) .Sand, 
Clay. 
The same sequence, with the occasional superaddition of the 
Great Oolite Clay, was shown to be repeated upon the western 
escarpment of the Ise, at Glendon, Barford Bridge, near Rock- 
” 9900 teens 
Upper Ties. tact 
‘ingham at Weekly, and at Geddington (the Lincolnshire lime- 
stone increasing in thickness at every advance), and to occur 
over and over again upon innumerable escarpments in the 
counties of Northampton, Rutland, Lincoln, and York, offering 
unmistakeable and incontrovertible evidence of the true strati- 
graphical position of the Lincolnshire limestone. 
February 21.—Annual General Meeting. His Grace the Duke 
of Argyll, K.T., F.R.S., president, in the chair. The Secretary 
read the Reports of the Council, and of the Library and Museum 
Committee. The general position of the Society was described 
as satisfactory, and the number of Fellows is said to have 
essentially increased. 
In presenting the Wollaston Gold Medal to Sir Philip de 
Malpas Grey-Egerton, Bart, F.R.S., F.G.S., the president 
spoke as follows :—‘ Sir Philip Egerton,—I consider myself 
fortunate in being the organ of the Geological Society in pre- 
senting you with the Wollaston Medal, which has been awarded 
to you by the Council for the present year. The eminent ser- 
vices which you have rendered to geology during a period now 
extending over forty years have long been familiar to scientific 
men, and have given you more than a European reputation. 
These services have been so great and so universally recognised, 
that the only difficulty I now have is not in assigning grounds 
for the vote which I have the pleasure of announcing, but in ex- 
plaining why it has been so long delayed. That delay has been 
occasioned, I believe, solely by the fact that you have yourself 
been so long an honoured member of the Council whose duty it 
is to consider the claims of geologists for the honours of this 
Society ; and whatever influence you have had in that body has 
doubtless been exerted in favour of others to the exclusion of 
yourself. It is at least some compensation for the loss which 
the Council sustains in your absence that it is now able to accord 
a recognition which has long been due. The many papers 
which you have contributed to this Society from 1833 down to 
the present time are a sufficient indication of the wide range of 
your observations. But the special attention you have bestowed 
and the light you have thrown on the structure and affinities o} 
fossil fishes and reptiles, have been of the highest value, and 
have formed in the aggregate a most important contribution to 
our knowledge of the history of organic life. I have the highest 
pleasure in now handing to you the Wollaston Medal.” 3 
Sir Philip Egerton, in reply, said :—‘* My Lord President, 
I know not whether it is owing to the poverty of the English 
language or to my unskilfulness in use of it, but Iam quite at a 
loss for words adequate to express my appreciation of the great 
and unexpected honour conferred upon me by the award of the 
Wollaston Medal, and for appropriate terms to convey to 
your Grace my acknowledgments of the kind, but too 
flattering terms you have used in communicating the decision of 
the Council; and my embarrassment is increased by the con- 
sciousness that, in comparison with those illustrious names 
which already adorn the Wollaston roll, I am quite unworthy 
[ Mar. 6, 1873 
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