99 
Century’ just published, referring to the great interest of many 
which had already been very useful to himself, as well as to the great 
elegance of the preparations, one and all. 
Mr. Archer showed fine examples of that handsome rotatorian 
Noteus quadricornis, which, at least in our walks, appears to be a 
rareform. He also showed Anwrea heptodon, seemingly not common, 
and some other forms. 
Mr. Archer showed various species of Euglena and Phacus in con- 
tradistinction, which presented themselves in a rather fortunate 
collection for these forms; some of these it was not an easy 
matter to identify; Dujardin’s figures do not appear sufficiently 
graphic in certain cases. Amongst those shown attention was 
drawn to a much twisted form of Phacus longicauda; this often 
occurs with one twist, but the preseut examples were three or more 
times twisted, and, moreover, presented the characteristic of possess- 
ing a keel- or wing-like projection upon one face, giving the form 
still more of a screw-like aspect, and forming a pretty object as it 
progressed along, turning on its axis as if went, and presenting a 
varied outline as it revolved. This could not be regarded as else 
than a form of Phacus longicauda, and might seemingly go to indicate 
that Phacus triquetra (Euglena triquetra, Ehr.) and Phacus 
pleuronectes (Nitzsch) were but one and thesame. These were both 
shown in the water, as well as that most tiny and, perhaps, most 
elegant of all, Phacus pyrum (Euglena pyrum, Ehr.). It would 
seem, perhaps, even to further indicate that the form brought 
forward at last meeting by Dr. Barker, considered by him to be 
Euglena geniculata, and now again shown for comparison, may be 
the representative of but one truly distinct form only, called by the 
various names of HB. geniculata, E. spirogyra, and even Phacus 
tripteris, supposing the strie on examples of the latter to have 
been overlooked. There is, however, a considerably smaller form 
than these, darker in colour, the skin brownish and thicker, and, above 
all, distinguished by the spirals being due to rows of thickened dot- 
like prominences, not uninterrupted minute ridges; this form Mr. 
Archer showed side by side in the present gathering, so fortunate for 
forms appertaining here. If this latter be the true E. spirogyra, 
then Dujardin’s figure is erroneous in presenting the striz as linear 
ridges, not as rows of conspicuous dots. This latter form occurs in 
several places. There was also shown a very elegant form, pro- 
bably the Euglena acus (Hhr.). This is long, slender, fusiform, 
not flexible, swimming along by no means slowly ; eye-speck rather 
large and bright red, anterior extremity truncate, “ tail acute ; this, 
in outline of the anterior extremity, might somewhat call to mind 
the aspect of a “ pipe-fish,”” without its flexibility. All these are, 
however, hard to discriminate, but, nevertheless, appear to be pretty 
constant to themselves. And besides certain specialities of the 
externals, those of the contents appear to be often characteristic too. 
Still, how far these are actually “ specific’? in their importance, 
though seemingly constant in their recurrence, would require a great 
deal more experience and research to determine. 
