INFUSORIA. 487 
H species, of which he identified 6 as also American. Q. J. Micr. Soc. 
xii. p. 98. 
Greeff’s paper on the VorUcellidcB {cf, Zool. Rec. vii. & viii.) is translated 
in Ann. N. H. (4) ix. pp. 106-1 12, 196-210, 384-397, and 462-473 : cf. Allman’s 
note “ On some points in the development of Vorticellidccy^ Q. J. Micr. Sc. 
xii. pp. 393 & 394. 
Noctiluca. 
Allman, G. J. Notes on Noctiluca. Q. J, Micr. Sc. xii. 
pp. 327-334, pi. 18. 
The most perfect account hitherto given of this organization, which 
consists essentially of an enormous vacuolated protoplasm, involving a 
nucleus and enclosed in a structureless sac, which is provided with an 
inferent, and probably also with an efferent opening j the vacuolation takes 
place to such an extent as to separate the contents into a peripheral layer of 
protoplasm, w^hich remains adherent to the outer sac, and a central mass 
kept in communication with the poriplioral layer by processes of protoplasm, 
which pass from one to the other in the form of a mesliwork of branched 
and intercommunicating filaments.” In these threads of protoplasm only 
feeble cyclotic movements could be traced by means of the refringent cor- 
puscles. The nucleus ” is not contractile. At the bottom of the spacious 
atrium” is the base of the flagellum and the gullet-shaped mouth, with 
its interior filament &c. The peripheral layer, in which the luminosity has 
its special seat, is studded with nucleated cells, to which the origin of the 
“ zoospores ” might be attributed. Noctiluca is most nearly related to Peri- 
dinimn, Ehrnbg., and especially to an allied organism described by Allman 
in 186^ 
L. CiENKowsKi describes shortly (Z. wiss. Zool. xxii. pp. 297 & 298 ; 
Q. J. Micr. Sc. xii. p. 414) the development of the “ zoospores.” They 
originate as numerous small elevations, forming together a shield of varied 
shape and size on the body, which, previously to the budding of the ‘^swarm- 
spores,” has lost funnel, mouth, nucleus, and flagellum, and is almost with- 
out any definite contents. Copulation is not an absolutely necessary intro- 
duction to this gemmiparous propagation, which is preceded by a division 
of the protoplasm into 2, 4, 8, 16 portions. The author agrees with 
Allman in regivrding Noctiluca as a gigantic Flagellate. 
