RHIZOPODA. 515 
phryan without any previous encysted condition (Q. J. Micr. Sc. July 1870, 
pp. 30G, 307). 
J. G. Waller has some observations on the conjugation of Actinophrys 
sol. J. Quek. Micr. Club, 1870, pp. 93-98. 
Acanthocystis spinifey-a, GreefF, recorded by Archer from Tipperary (Proc. 
R. Irish Ac. Dec. 12, 1870). In the centre of the presumed central capsule 
Archer figures a minute round body, deeply taking on the carmine dye, 
and which he considers may be the “ vesicula intima.” The same struc- 
tures were observed in A. pertyana, Archer, in which he had previously failed 
to make out a central capsule ; but in this case the central capsule took on the 
dye as well as did the inner vesicle. A. spinifcra was observed in conjuga- 
tion ; the yellow globules seen in this species are regarded by Mr. Archer as 
oil-globules. 
After examination of several Radiolaria, collected partly in Messina and 
partly in the Canary Islands {Thalassicolla pelagica, Collozoum inerme, 4 spe- 
cies of Sphcerozoum, Raphidozoum acufet'um, and Collospl%(srahuxleyi), Hackel 
finds that certain granules in their yellow cells are coloured blue by iodine, 
and are therefore starch. According to Muller, the yellow cells only became 
dark brown when treated with iodine. Hackel explains this by supposing 
that the magnifying-power used was not strong enough (it must be at least 
700 diam.), so that the intense yellow of the remaining protoplasm dis- 
guised the blue of the starch -granules. (Jen. Z. Nat, v. 1870, pp. 492-560.) 
Myxobrachittf g. n., Hackel (Jen. Z. Nat. v. 1870, pp. 492-660). Central 
capsule globular, with vesicula intima. Extracapsular sarcode prolonged 
into 1 or more depending arm-like processes, whose button-shaped ends 
enclose collections of calcareous spicules or concretions. Central capsule 
excentric, in the pear-shaped mass of alveoles, which is swollen towards the 
upperside of the sarcode body. Yellow cells numerous around the central 
capsule, and traversing the arms in a row. M. pluletis, sp. nov., Hackel 
(/. c.), arms as many as IG ; M. rhopahim, sp. nov., Hackel (/. c.), with only 
one arm. Both from Lanzarote. This singular genus of Radiolaria owes its 
interest to the calcareous bodies contained in the terminations of its arms, 
and which greatly resemble the well-known coccoliths and coccospheres of 
the Atlantic sea-bottom ; but unfortunately Hackel neglected to determine 
the question of their identity beyond doubt. If they are identical, Hackel 
asks. How do they get to the surface of the water, seeing that the Myxohrachia 
floats ? for it is very improbable that the great masses of coccoliths and 
coccospheres at the bottom of the Atlantic should be only the spicules of 
pelagic Radiolaria sunk to the bottom after the death of the creatures which 
formed them. 
Thalassicolla sanyuinoU'nta^ sp. nov., Hackel (?'5. p, 52G), Lanzarote. Very 
like Myxohrachia y but has no arms. 
In Carpenter, Jeffreys, and W. Thomson’s Report on the ^ Porcupine ’ 
Expedition of 18G9 (Proc. R. Soc. xviii. pp. 397-492) frequent mention is 
made of Foraminifera and also of Polycystina, In the warmer parts of the 
areas dredged in the three cruises Foraminifera were, as before, extremely 
numerous, a large proportion being arenaceous. 
Mention is made (p. 421) of a peculiarly interesting Orhitolites (O. tenuis- 
simus, sp. nov.. Carp. P. R. Soc. xix. p. 166) dredged from 1443 fathoms 
depth, off the N.W. coast of Ireland, a type not hitherto di.scovered north of 
