52 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Foraminifera of Deep Water off the S.W. Coast of Ireland.* — Mr. 
Joseph Wright gives a list of the species of Foraminifera dredged in 
1000 fathoms during Mr. Green’s recent expedition. Among the forms 
noted as very rare are Bilocidina sphdera and B. elongata, Planispirina 
contraria, Cornuspira carinata, Astrorhiza arenaria, several species of 
Bulimina, and others. 
Cytoplasm and Nucleus in Noctilucse.f — M. G. Pouchet, who has 
already shown that by abundantly feeding Noctilucae one may produce 
in them in a few days cellular segmentation and, later, gemmation, has 
continued his observations. The plastic cytoplasm is not hyaline, but 
uniformly granular, the granulations being all of the same diameter and 
refractive power, and separated by equal distances from one another. It 
always lies near the nucleus, and the latter is somewhat different from 
that of forms already known. The chromatin seems to be formed of two 
substances, which, perhaps, correspond to the microsomes and hyaloplasm 
dissolved in one another. During gemmation, and as the nuclei multiply, 
the mass of chromatin increases absolutely, but it would seem that the 
proportion of chromatoplasm increases, from what is shown by the more 
and more vivid coloration of the segmented nuclei. In ends which have 
become free, the spherical nucleus is completely and uniformly coloured 
by methyl-green. At no time and in no stage do Noctilucse appear to 
have nucleoli. 
New Sporozoon in Vesiculse seminales of Perichseta.J — Mr. F. E. 
Beddard has observed a remarkable Gregarine in the vesiculse seminales 
of a sj)ecies of PericJiseta from New Zealand, in which they were present 
in crowds. In the youngest stage this Gregarine has a spherical body 
with one or two long processes. If there are two, they are placed at 
opposite poles. There is a delicate cuticle, and ectoplasm and endoplasm 
can be distinguished. In the next stage they are, though larger, similar 
in form. The granules of the endoplasm are, for the most part, large 
and oval. The endoplasm is especially thick in the processes of the 
body. The cuticle is raised into fine ridges which run obliquely to the 
long axis. In this stage, and in the last, multiplication by fission occurs. 
A swelling at the extremity of one of the processes gradually grows, 
developes a process at its other free extremity, and becomes separated 
as a new individual. In the third stage the Gregarine is covered by a 
cyst-membrane consisting of a fibrous substance, in which numerous 
nuclei are imbedded. In this stage sporulation occurs, commencing by 
a rapid division of the at first single nucleus. Karyokinetic figures are 
formed during the division of the nucleus. The protoplasm also divides, 
but not so rapidly as the nucleus. 
* Ann. and Mag^. Nat. Hist., iv. (1889) pp. 447-9. 
t Comptes Kendus, cix. (1889) pp. 706-7. 
X Zool. Jahrb., iv. (1889) pp. 781-92 (1 pi.). 
