276 PROCEEDINGS OF SOCIETIES. 
Dr. Frazer, referring to a former instance in which portions of 
the pulp of an orange had been sent to him as hydatids taken 
from the human stomach, mentioned another instance of the same 
blunder having been made within the last week. This was a good 
instance of how easy it is to fall into an error from want of a 
sufficiently accurate diagnosis of various objects, which may more 
or less simulate each other, without having the smallest affinity or 
community of nature. 
Mr. Archer had an opportunity to show specimens of Coleochete 
orbiculare, quite barren, unfortunately. These were, indeed, 
mainly remarkable for the great number of bristles issuing from 
the frond, whereas Pringsheim, whilst he justly regards this 
character as of little importance, describes this species as re- 
markable for the fewness of the bristles. 
Mr. Archer would here venture to observe that it seemed to 
him quite probable that the plant lately recorded by Dr. Gray in 
Seeman’s ‘ Journal of Botany’ as a Phyllactidium, is in reality a 
Coleochete ; but without figures it would not be easy to form a 
definite opinion, and it is to be hoped that Dr. Gray may fulfil 
his promise by giving a plate of his plant. 
Mr. Archer showed, likewise, a Bulbochete in fruit, which he 
regarded as Pringsheim’s Bulbochete gigantea, these specimens 
being chiefly remarkable for the very short “foot” to the 
antheridium, and the somewhat varying sizes of the oogonia, as 
compared with Pringsheim’s figures and descriptions of his 
species. 
Mr. Archer drew attention to the record in de Bary’s recent 
work treating of Lichens, in Hofmeister’s ‘ Handbuch der physio- 
logischen Botanik’ (Band ii, p. 270), of what he (Mr. Archer) 
conceived was nothing else than the plant we know as Chroolepus 
ebeneum. As Mr. Archer had already exhibited this plant, and 
showed its structure, and referred to it on two occasions at the- 
_Meetings of the Club (‘ Quart. Journ. Mic. Sci.,’ vol. xiii, p. 168), 
indicating reasons why it may be considered a lichen rather than 
an alga, and predicating for it an apothecium whenever it may be 
found fruited, he thought it right to mention that that idea was 
not then borrowed, and that until he saw de Bary’s work a few 
days ago, he did not know that lichenists had already claimed 
this species. 
Mr. Archer showed also a number of dried Desmids from Italy, 
thanks to the kindness of Professor Gagliardi, which were quite 
identical with British species. 
ee 
