ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
219 
flagella, which are described by von Lcndenfeld as present in all 
Calcareous Sponges, and the author expresses scepticism as to their 
existence. 
Sponges of Oceanic Shores of France.*— M. E. Topsent gives a 
list of forty-one species of Sponges collected on the coasts of France that 
are washed by the Atlantic ; of these all but three have already been 
found also on the northern coasts, but a closer study of the fauna of the 
Bay of Biscay would probably reveal some new forms. 
Protozoa. 
Remarkable Argentine Protozoa.! — Prof. J. Frenzel describes 
several remarkable Protozoa which ho has observed in the Argentine 
Republic. Chromatella argentina g. et sp. n. is an Amoeboid organism 
with a diameter of only *005 to *006 mm. Its form is like that of 
Amoeba (Dactylospheera) radiosa, tho pseudopodia move slowly, and serve 
also as tactile and seizing organs. As they radiate in all directions no 
anterior or posterior end is indicated. There is but slight differentiation 
into ectoplasm and endoplasm ; the protoplasm contains a number of 
small granules. In tho living state no signs of a nucleus are discernible ; 
there is only one pulsating vacuole. After trying a number of reagents 
the author was forced to conclude that the nuclear substance was repre- 
sented merely by granules. 
Grinya filiformis g. et sp. n. has a certain resemblance to Biomyxa 
vagans ; it is small in size, of an elongated spindle shape, each pole 
gradually passing into a pseudopodium which is generally curved like 
an S. The contour of the body is knobby rather than smooth. There 
is no distinction into ectoplasm and endoplasm, and what are callel 
pseudopodia are nothing more than thinned out continuations of 
the body. There are three to five vacuoles, which pulsate at regular 
intervals. Nothing can be certainly said as to the presence of a nucleus. 
Gringa (Protamoeba) flava sp. n. is in optic section multangular, 
and the pseudopodia are given off as delicate and almost filamentar 
processes from the angles. They are curved and branching, but they 
do not fuse to form a network. The contour is still rougher than 
in G . filiformis. No signs of a nucleus could be detected. 
Stylamceba sessilis g. et sp. n. is interesting as being the first true 
Rhizopod which is known to lead a fixed life. The central body 
is spherical to oval and has two poles ; from the lower pole there is 
given off the foot, in the form of a pseudopodiura, while two or three 
pseudopodia radiate from the upper pole ; tho footstalk passes more 
or less gradually into the body, so that the whole has the form of a 
Vorticella ; the upper pseudopodia are thin and finger-like, and have 
rounded ends. The foot is capable of considerable contraction, or may 
thin out to a filament ; the pseudopodia move like the tentacles of a 
Hydra. The endoplasm is distinct from the ectoplasm, and not only 
occupies the centre of the body, but also the whole of the foot; it is 
very rich in granules. A nucleus is present, but leagents are needed 
to make it distinctly visible. 
* Bull. Soc. Zool. France, xvi. (1891) pp. 127-9. 
f Zeitsuhr. f. Wiss. Zool., liii. (1891) pp. 331-GO (1 pb). 
