318 SECTIONAL TRANSACTIONS.—D. 
is the result. Among the Stomatopoda, however, in Lysiosquilla the 
swimming function is seen to be passed gradually from the thoracic ap- 
pendages to the pleopods. It is suggested that this orderliness of develop- 
ment is due to the absence of a respiratory current in the Stomatopoda. 
Mr. A. G. Lownpes.—The movement of ostracod spermatozoa as shown by 
the cinematograph film (12.0). 
Fresh-water ostracods possess both relatively and absolutely the largest 
sperms known throughout the animal kingdom. ‘Their length may be as 
much as ten times the length of the adult male. 
If these sperms are taken from the male they show no sign of movement, 
but if they are taken from the spermatheca of the female they are highly 
motile. 
While the spermatogenesis has been worked out in a few species, no 
nucleus has been found in the adult sperms, and there is strong evidence 
that the sperms are now functionless. 
The sperms have been filmed under varying powers of the microscope 
and the nature of the movement examined. 
The survival of these functionless sperms, and especially the survival of 
a very long spermathecal duct in genera and species in which males have 
long ceased to occur, presents an interesting problem from a genetical point 
of view. It is hoped that this point will be discussed. 
Dr. H. Sanpon.—Pseudopodial structure and movements in Foraminifera 
(12.30). 
The pseudopodia of Foraminifera have been studied from three points 
of view: (1) In relation to the life processes (especially feeding and 
locomotion) of the Foraminifera themselves, (2) in connection with the 
interrelationships of the different orders of Rhizopoda (the separation of 
which is based largely on pseudopodial form), and (3) in connection with 
more general problems of protoplasmic structure and movement. 
Commonly even the finest pseudopodial thread contains two oppositely 
moving streams of granules, the velocities of which are independent of the 
thickness of the thread. A relatively tough moving ‘ skin’ is also present 
on whose properties depends the selection (i.e. adhesion or non-adhesion) 
of food and other foreign objects. The exact location of the other moving 
parts and the existence of an axial rod are more doubtful. The proto- 
plasmic movements are independent of the existence of a free pseudopodial 
tip or of contact of the pseudopodium with a substratum, and are therefore 
not dependent on any gradient in surface tension, etc. Analogy with the 
known structure of an amceban pseudopodium is of only very limited 
application. Some preliminary experiments on the effects of chemical 
and other stimuli seem to open up a promising method of studying the 
physical conditions which confer the necessary stability on these fine fluid 
threads. 
AFTERNOON. 
Prof. W. C. O. Hitt.—The affinities of the Lorisoids (2.15). 
Definition of the Lorisoids to include Slender and Slow Lorises, Galagos 
and Pottos. Characters which all these have in common. Characters in 
which they resemble the Lemuroids. Characters in common with Tarsioids. 
General status therefore intermediate. Position of Cheirogaleus. Relation 
of Loris to the remaining Lorisoids and to Tarsius. General appearance 
