ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 623 



It was common about the moults of Decapod Crustacea. The locaUzed 

 contractile vacuole, the heterokaryote nuclear apparatus, the typical 

 division of the meganueleus and micronucleus, and the transverse fission, 

 indicate its position among Ciliata. Within a transparent cyst Gymno- 

 dinioides produces about thirty merozoites quite unlike the present unit, 

 like minute Cryptomonad Flagellates. In another remarkable form, 

 Polyspira delagei g. etsp. n., visible to the naked eye, chains of 2-5 in- 

 dividuals are formed by transverse division, and simultaneously or a 

 little in advance, the individuals divide longitudinally without separating, 

 and the chains become double. But this is not all : the individuals of a 

 pair conjugate with one another and show all the typical nuclear changes. 

 A double chain may divide into two chains of ex-conjugates. And these 

 show themselves to be Cryptomonad-like, similar to the mesozoites of 

 Gymnodinioides. Details of this extraordinary " adelphogamic di- 

 schizogonv " will be awaited with interest. 



Notes on Sporozoa.* — H. M. Woodcock discusses Karyolysus larertae 

 (Danil.) and other Hasmogregarines of lizards. A small individual of 

 Karyolysus penetrates a red blood corpuscle and begins to grow. As 

 the parasite grows, changes in the nuclear constitution and position take 

 place. At about the same time a definite envelope or capsule is formed 

 around the parasite, inside which the latter tends to acquire, by bending 

 up, a characteristic U -shape, and ultimately becomes stout and bean- 

 like. The presence of the Hsemogregarine causes very great changes in 

 the appearance of the host-cell, hypertrophy and pronounced alteration 

 in the shape of its nucleus, sometimes its iission. The cytoplasm, or 

 what remains of it, becomes difficult to see. 



The author makes a comparison of the nuclear condition in K. lacertse 

 and certain other Ha^mogregarines with that in Coccidia, and discusses 

 the question of the karyosome and the intranuclear division-centre. 

 Agreeing with Siedlecki, he regards the karyosome as an organella, whose 

 principal function is to store up reserve chromatin — and particularly 

 trophic as distinct from generative chromatin — for use as and when 

 required by the nucleus ; or, as the case may be, for elimination if not 

 required. "Woodcock deals also with the nuclear structure of Leiico- 

 cytozooji and Halteridium ; the significance of the so-called binucleate 

 condition in these forms, and its bearing iTpon the affinities of the 

 Hfemosporidia. 



Minute Structure of Gregarines.f — G. Viguier and A. Weber have 

 studied Hsernogregarina sergentium Nicolle from Gongylus oceUatus, with 

 special reference to the chromophilous granulations in the cytoplasm. 

 Some of these are of nuclear origin, and to be ranked as chromidial. 

 Others which appear in association with a terminal vacuole, are to be 

 ranked as mitochondrial. 



Supposed Haplosporidian in Man.:]: — Max Hartmann refers to a 

 remarkable parasite discovered hj Dr. Schoo in the spleen, liver, etc., 



* Quart. Journ. Micr. Sci., Iviii. (1912) pp. 171-240 (2 pis.). 



t C.R. Soc. Biol. Paris, Ixxii. (1912) pp. 92-3. 



+ Centralbl. Bakt. Parasitenk., liv. (1912) Beiheft, pp. 253-5 (1 fig.). 



