T. 0. Hilgard—Infusorial Circuit of Generations. 89 
Se., 1833, Tab. III, figs. 11, 1, and Iv, which belong here (as 
well as Tab, XXIV and XXV of os Pritchard’s Hist. Inf. 
1861), are too onto to serve as a guide, or to be rea dily 
identifiable even by those see with the real, natural 
object- aiaiseiat 3 itself. 
At first the bristles of the (tongue-shaped, flat and elongate- 
_ — Oxytricha are fluttering and tremulous; - as - 
and rapidly increases in bulk, all the well- known 
of the complete ‘Oxytri richa,” its stiffish darting- beissiae 
its grumose, obscured body, irregularly replete with granular 
olks, and very frequently cross-dividing, become typified. 
en thus cross-divided (a process well-known and abundantly 
figured) the front part alone retains the barbed mouth, which, 
from the apex, switches down like a moustache on a longitudi- 
nal slit about a quarter of the whole length. The blunt rear- 
part, on the contrary, separates with an incurrent angle which 
Soon contracts into a new mouth; whereby the rear-animal 
takes a blunter “ge (like the cetydideai of an almond, the flat 
side downw ard). 
Seen to “copulate” or adhere lengthwise, or in any other 
fashion, to one another, except in the process of self-division. 
Nor does it readily divide by longitudinal fission, in this state. 
T have seen this scan once. Crawling, and darting by an ay 
rly 
’ coos cape in the rear - portion, sr a great number of 
an and smaller granular Law its body So a e 
dle a large, clear and granulate ‘“ germinal spec 
cleus, which j se ’ often observed to swell, protruding globalary 
over th the pair ae below and above, when seen crawling, in 
pro: 
Oceasion nally it is seen to extrude, suddenly, that turgid 
germinal nucleus or yolk (vitellus), which, as in all these cases, 
Is itself coatless, but hung around with divers jerking molecular 
fragments, torn loose from the parental body a ch is rup- 
ed on the spot, but readily “ re-cemented,” as it were. 
* The transformation of the “rear-part” of Oxytricha, as given by J. Haime 
m Ann. Sci. ee ee tom. Gua ie (and So erage in C: Micr,. p. 447 
oe I have not been able to verify myself; it m y pd 
means be confounded with the encystoncats ( ) of ‘rorticela, “producing wafer- 
; (2) of the non-pulsating, “Paramecium I grub, 
pa ducing tree Oxytricha; nor (3) with "thal ot the “ oyster” or porte manne 
er, producing paramecium-like gregarina-fashion ; nor either (4), wi 
Some large Oxytricha “ currants,” containing the revolving “ crucible. 
