42 
the same appearance as when first observed, viz., the young visible in 
the chamber of the carapace. 
On the following morning both fleas were living, but the last 
mentioned had discharged her four embryos, which were alive in the 
box. She also had moulted. Though he had not witnessed it, he was 
inclined to think that the birth of the embryos and the moulting of the 
carapace were simultaneous acts. It was well known, the Daphnia 
exhibited two distinct kinds of eggs, the agamic and ephippial, which 
were easily distinguished, the latter by their darker colour and absence 
of oil globules ; moreover, the carapace enclosing the ephippial eggs was 
much thickened and otherwise modified in structure, so that when the 
creature shed its carapace the ephippial eggs were cast away with it. 
The agamic eggs were much more transparent and showed auabundance of 
oil or yolk globules congregated in their centres. They never became 
dark or opaque as did the ephippial eggs, and there was no thickening or 
- other modification of the egg chamber of the carapace, nor could a 
limiting membrane be detected in some agamic eggs. At a very early 
period the yolk mass termed the egg began to divide, and the members 
of the nascent embryo were easily observed moving without any limiting 
membrane, long before the time of birth. If the ephippial eggs were 
known to be cast with the moulting, it was not improbable that the 
young derived from agamic eggs were born quite or nearly simulta- 
neously with the moultings of the parent. 
Mr, MarsHatt Hatt exhibited a new pocket lamp by Moginie 
of London, which appeared to be a very compact and portable appa- 
ratus. 
Mr. Wonror exhibited a fresh specimen of the Morel Morchella 
esculenta obtained near Brighton. 
The meeting then became a Conversazione, when 
Mr. Marsnatt Hatt exhibited spicules of the new sponge, Phe- 
ronema Grayii, dredged up by him off the coast of Spain. 
Mr. Sewe tt exhibited scalariform tissue of fern, sections of cocoa- 
nut wood, whalebone, &c. 
Mr, Hennau, under one of Beck’s new one-tenth immersion lenges, 
exhibited living diatoms : the performance of this lens was pronounced 
very perfect, the definition being very precise, while the distance at. 
