Geological Society. 207 
of its peculiar tentacles. It is, of course, quite possible that 
such have been overlooked, especially in view of the fact 
that so few of the Cestodes known ‘to science have been 
examined in a living condition. Their extreme retractility, 
amounting almost to disappearance, would render it most 
easy to miss them in sections through the scolex. I have 
myself been unable to discover them in sections of Rhab- 
dometra cylindrica. If this lack of tentacles is only apparent 
and due to the difficulty of seeing them, it may be that this 
worm is identical with Rhabdometra numida, a species 
described by Fuhrmann from the Guinea-fowl N. pitilo- 
rhyncha*, While therefore I believe myself to be correct in 
describing the worm as a “ new tentaculate Cestode,” it may 
not be a new Cestode. But further investigation is required 
before it can be asserted that the existence of retractile 
tentacles is characteristic of the genus Rhabdometra, and, for 
the matter of that, of other genera. 
PROCEEDINGS OF LEARNED SOCIETIES. 
GEOLOGICAL SOCIETY. 
November 19th, 1919.—Mr. G. W. Lamplugh, F.R.S., 
President, in the Chair. 
The following communication was read :— 
‘The Pleistocene Deposits around Cambridge.’ By Prof. John 
Edward Marr, Se.D., F.R.S., V.P.G.S. 
This paper deals with the deposits in the immediate vicinity of 
Cambridge, and contains new records of sections, fossils, and imple- 
ments. It is pointed out that, owing to alternating periods of 
erosion and aggradation, relative height above sea-level is nota 
trustworthy index of antiquity, and modifications of the classification 
proposed by W. Penning and A. J. Jukes-Browne are indicated. 
The Author suggests the following chronological sequence, in 
descending order :— 
Feet 
(ie Barnwell Station Beds.2e-.sssawdssteniess ceed. 20 
(2) Newer Downing Site Beds .................000000 35 
(3) Newer Barnwell Village Beds.................... 45 
(4) Huntingdon Road: Claysicre. tence. eeecen cs « 70 
(6) Observatory Beds. 7 ieee soy cee 85 
(6) Corbicula Gravels (Barnwell village, etc.) ... 30 
oS SE eee a 
* Swedish Zool, Exp. Egypt, pt. iii. 1909, p. 36. 
