PROCEEDINGS OP SOCIETIES. 
43 
loss sustained by tlie club was moved by Dr. Braithwaite, and duly 
carried. 
Mr. W. W. Jones described an instrument for cleaning very thin 
covering glass without danger of fracture. 
Mr. T. C. White made a further communication respecting the 
salivary glands of the cockroach, and described an instance in which 
the sac when dissected out was found filled with fluid containing 
salivary corpuscles. He exhibited one of these sacs still attached to 
the thorax, the whole being immersed in alcohol. 
Dr. D. Moore read a paper, giving " The results of some observa- 
tions on the Bucephalus Haimeanus of M. Lacaze-Duthiers, and another 
allied organism not yet named." Soon after reading his last paper, 
he found that the organism he had figured as the young of the cockle 
had been fully described by M. Lacaze-Duthiers, in the ' French 
Annals of Natural History,' under the name of Bucephalus Haimeanus, 
the other allied organism obtained from the mussel not having been, 
so far as he knew, either described or named. The admirable resume 
of the subject by one of the Hon. Secretaries of the Eoyal Microscopical 
Society, which appeared in the ' Monthly Microscopical Journal ' for 
April, rendered the history Vv^hich he had intended to give of previous 
observations and conclusions unnecessary. He then gave a short 
sketch of the life history of a Cercarian, Cercaria ephemera, described 
by Siebold, which went through all its changes in certain water-snails, 
whose skin it penetrated, in which it became encysted, and developed 
into a perfect sexual Distoma, whose eggs in the course of time pro- 
duced the sporocysts or nurses, which were found to contain Cercarice 
in various stages of development, which being ultimately set free from 
the sporocysts and snail in a way not clearly traced, might then be 
found as freely-moving Cercarice in the water, ready to start on the 
same round again, thus forming a complete illustration of alternation 
of generations. This life history, with modifications, was supposed to 
apply to B. Haimeanus, the ramified tubular structure in which it 
was found being considered a sporocyst. After comparing his own 
observations with those of M. Lacaze-Duthiers, showing that the facts 
observed were much the same, although the interpretation he had 
been led to put on them was different, he pointed out that the 
branched character and apparent connection with egg-sacs observed in 
this structure might be accounted for, supposing it an anomalous form 
of sporocyst, by such sporocyst being contained in the genital ducts. 
The presence of blind extremities, and an appearance of budding, he 
had thought indicated the points where egg-sacs had emptied their 
contents into the tubular structure. If it were a sporocyst, the blind 
extremities were doubtless the ends which M. Duthiers had found it 
almost impossible to examine. Other appearances described by M. 
Duthiers he briefly alluded to, the interpretation he had put upon 
them being influenced by his different experience. He had never 
found B. Haimeanus in oysters, but only in cockles containing fully 
formed eggs, although he had examined large numbers procured from 
Hayling, where from their juxtaposition it would appear probable 
that this organism might be found in both if parasitic. He thought 
