Clathrulina el eg an s, Cienkoicsky, in Essex. 53 
external spinulose membrane. After some time the cysts 
develop nucleated and flagellated zoospores, which finally 
pass through the Actinophrys-]ike and Clathrulina stages, as 
in (J) In this mode (as observed by Sara G. Foulke, 
Proc. Acad. Nat. Sci. Philad., 1884) the Clathrulina with¬ 
draws its rays and the protoplasm divides, as above mentioned 
in section a, but the masses are smooth and transparent. 
After a period of quiescence, each sarcode mass passed out of 
the capsule, developed a flagellum, and swam freely about in 
the water. “Finally it was seen to attach the top of its 
flagellum to the glass and revolve swiftly for a few moments, 
when instantly the whole body became spherical, rays were 
shot out, and the transformed monad was in no point, except 
that of size, to be distinguished from its Actinophrys- like 
cousin.’’ This reproduction by free-swimming monad-forms 
may be of great service in securing a widespread distribution 
of the species, and so preventing its destruction by the 
dangers attendant upon a too-restricted habitat. 
In addition to the references given in the above notes, the 
reader will find information in Mr. Archer’s papers in the 
‘ Quarterly Journal of Microscopical Science ’ (1868-1877), 
and in Journ. Eoy. Microscopical Soc. for 1884 (Ser. ii., 
vol. iv., p. 402). It is to be hoped that those of our members 
possessing the requisite microscopical powers will search for 
Clathrulina in Essex, and endeavour to follow out the various 
details of its reproduction and development, which are hardly 
yet thoroughly understood, and which seem to be of very 
great biological interest.— Ed.] 
