PROCEEDINGS OF SOCIETIES. 123 



1858. This form seems quite distinct and constant ; it is compara- 

 tively but a small form, and the test of a reddish or foxy colour, 

 and broadly elliptic figure ; the foreign particles are impacted with 

 beautiful regularity, so that the mosaic work presents a very even 

 external surface ; there is a short but distinct neck, of a smooth 

 appearance and darker colour, seemingly without particles and 

 undulate at the opening, presenting thus a few shallow lobes. This 

 is a quite distinct looking form, its reddish colour and even outline 

 causing it to be readily detected even under a moderate power. 



Dr. John Barker exhibited excellent characteristic examples of 

 the very minute but seemingly very distinct and constant little 

 rhizopod to which he had first drawn attention at the Club meeting 

 February, 18G7 ; but on that occasion he had not a specimen to 

 show. This is exceedingly minute, nearly orbicular or broadly 

 elliptic ; from two opposite points there emanates a tuft of filiform 

 pseudopodia ; and in the body of the organism is immersed an oil- 

 like refractive globule of an orange or amber colour. The tufts of 

 pseudopodia have been here alluded to as opposite one another, but 

 they are not diametrically so, being always placed slightly oblique 

 to one another. There are, of course, two positions of the organism 

 as regards the observer, when the tufts of pseudopodia might present 

 the appearance of being exactly opposite, but a partial revolution of 

 the organism shows that they are not really so. Dr. Barker showed 

 some examples with the pseudopodia retracted, and their place 

 occupied seemingly by a minute globular, hernia-like, sarcode pro- 

 trusion ; other exam])les showed neither pseudopodia nor this little 

 globular protrusion, but in their place a little depression, pointing 

 to the existence of a kind of coat or cuticle, with two minute aper- 

 tures for the emission of the pseudopodia. For this creature Dr. 

 Barker would propose the name of Diplophrys (nov. gen.), and 

 would call it Diplophrys Archeri. 



Mr. Archer, in reference to Dr. Barker's new rhizopodous form, 

 said that, so far as he could venture to form an opinion, it should be 

 relegated to a new genus, although, supposing it has a test, it 

 might be thought by some to appertain to and form a second species 

 in his own rhizopodous genus Amphitrema. But Diplophrys would 

 be to Amphitrema in some measure as Cyphoderia or Euglypha to 

 Pseudodifflugia (Schlumberger), or as Arcella to Difflugia, which 

 he thought as yet to be well founded as distinct generic types, not- 

 withstanding the views of some that all these are but extreme 

 varieties of one and the same protean rhizopod. Nothing could be 

 more distinct and constant, per se, than Dr. Barker's little 

 Diplophrys. Mr. Archer had several times met with it since Dr. 

 Barker first pointed it out, and it was always readily recognisable 

 when encountered, even when its pseudopodia were not extended ; 

 but its great minuteness well calculated it to elude observation, 

 unless it accidentally presented itself under a comparatively high 

 amplification. 



Dr. Robert M'Donnell exhibited some specimens of the entozoon 

 known as the Trichina spiralis, met with in the muscle of man. 



