222 
Proceedings of the Royal Society 
the other, utterly ignoring, if the expression may be allowed, its 
proximity, while the vas deferens fades away in a mass of rather 
loose cells without showing the least desire to unite with its com- 
panion. 
According to Leuckart’s account of the development of these 
organs in P. tcenioides, there is first formed a continuous tube 
extending from the testis to the external surface, and the curved 
caecal tube is formed later as an outgrowth from it ; * this makes 
it more difficult to understand why a stoppage should occur in a 
tube which was once open, and which must be open again in the 
adult condition of the animal, in order to allow of the functional 
activity of the reproductive organs. 
The posterior of the two tubes given off from the sac above 
mentioned does not extend backwards beyond the sac itself ; its 
lumen is almost filled, and reduced to a crescentic form by a cylindrical 
body, attached by one side to the interior of the tube ; anteriorly 
it terminates in a sharp point, and is clearly homologous with two 
conical bodies which Leuckart has described in P. tcenioides under 
the name “ Chitinzapfen,” f and which he regards as being in some 
way accessory to the process of reproduction, 
BUSINESS. 
The following Candidates were balloted for and declared duly 
elected Fellows of the Society; — Mr J. B. Eeadman; Mr Henry 
Hewcombe, F.R.C.S.E.; Mr Charles Watson. 
Monday, ISth June. 
Professoe DOUGLAS MACLAGAM, Vice-President, 
in the Chair. 
The Chairman read a Memoir of the late Sir Wyville Thomson, 
drawn up by Professor Eedfern. 
The following Communications were read : — 
* Ijeuckart, Ba%i Entwickelungsgescli. d. Pentastomen, 1860 ; S. 134, tab. 
iv. fig. . . 
t Loc. cit., S. 78. 
