DUBLIN MICROSCOPICAL CLUB. 337 



new forms of algae of strictly parasitic nature, so long over- 

 looked, though possibly many of them may be widely enough 

 dispersed. 



Some rare HMzopoclous forms exTiihited, with a new species of 

 Quadrula, Schulze. — Mr. Archer had on the table some seemingly 

 rare Ehizopodous forms, though the great difficulty of finding in 

 a moment objects so minute and so readily evading observation 

 prevented his being able to exhibit them individually. Amongst 

 these was Plagiophrys sacciformis, Hertwig et Lesser, a form 

 of Pseudochlamys patella, Clap, et Lachm., as well as Quadrula 

 symmetrica (Wallich) Eilhard Schulze, and he was further able 

 to show a new form appertaining to the latter genus. Mr. 

 Archer must altogether concur with Professor Schulze in the pro- 

 priety of making a genus distinct from Difflugia, of which Dr. 

 Wallich's form D. symmetrica was the type, and, in illustration, 

 Mr. Archer was able to exhibit at same time a specimen of that 

 very marked form. The new form which he had now the pleasure 

 to show was distinguished from Q. symmetrica by being smaller, 

 quite without any " neck," the opening irregular and without any 

 rim-like border ; the square or oblong, occasionally triangular, 

 "plates" of the test much more irregular and varying in size ; it 

 showed also now and again a few spines comparable to those of 

 JEuylypha compressa, but much fewer. The "plates" were of 

 much more variable size than in Quadrula symmetrica, very large 

 and very small side by side. They often showed a square inner 

 space which was either much thinner than the frame-like outer 

 part, or this space represented possibly a square opening occupy- 

 ing a greater or less proportion of the area of the plate, some- 

 times, indeed, reduced to a minute dot ; often indeed, absent, and 

 the plates like those of the other form. Thus this form, apart 

 from the want of any projecting border to the mouth of the test, 

 might be said to bear a relation to Q. symmetrica, somewhat com- 

 parable to that of Euglypha glohosa to Euglypha alveolata. Mr. 

 Archer hoped to prepare a more enlarged description and a figure 

 of this form, which he would call Q. irregularis, for some future 

 occasion. — Mr. Archer further presented a preparation in Beale's 

 Carmine fluid of the curious Amoeba form, plus a cluster of 

 finger-like posterior appendages =Ouramoeba, Leidy, which, how- 

 ever, did not cause any contraction of the processes, a fact, so far 

 capable of being urged by Professor Leidy in favour of his views; 

 but, on the other hand, the gathering abounded with specimens 

 of the ordinary character, that is, without the faintest evidence of 

 any linear processes — simple Amosba villosa (princeps), — but, the 

 appendages apart, quite identical with the so-called Ouramceba. 



Blood-cells from a leukhcemic patient exhibited. — Mr. B. W. 

 Eichardson exhibited a mounting of blood-cells taken from a 

 leukhaemic patient ; the white cells were largely increased in 

 number and varied in size ; the resemblance of many of them to 

 pus-cella was very striking. 



Exhibition of section of Spine of Strongylocentrotus lividus, in 



VOL. XVI. NEW SER. Y 



