104 Tue Microscope. 
ing of the pedicle is a mystery. It is possible that when the 
creature darts backward into its sheath a rotation in the oppo- 
site direction may straighten out its affairs; but of this I have 
witnessed nothing, as its retractile movement is very rapid. _ 
The ciliation of the cuticular surface is, as the specific name 
indicates, and as stated by the discoverer, confined to the ante- 
rior region. 
Nothing has been published, or, I presume, observed, in 
reference to the position of the anal orifice. In my specimens 
it opens anteriorly, outside of the peristome border and at one 
side of the pharyngeal cleft (aa, in Figure 2). The contractile 
vesicle is somewhat larger and more anteriorly placed, and the 
nucleus rounder and more granular than represented by the 
discoverer’s figures, but with these unimportant exceptions and 
the partial ciliation of the pharyngeal passage, which may easily 
be overlooked, and is, indeed, visible only when that cleft is 
widely expanded. the forms in my gathering do not essentially 
differ from Tintinnidium semiciliatum. The mucilaginous 
loriea is .0050 inch long, the animal, exclusive of adoral wreath 
and pedicle, .0028 inch. Figure 2 represents an optical some- 
what diagrammatic section of the Infusorian as observed by the 
writer. 
Reproduction is by transverse fission, the first noticeable 
feature of the process being the appearance of the adoral cilia 
on one side of the equatorial region of the mature zooid. The 
newly formed cilia do not seem to become fimbriated before the 
escape of the separating moiety. The nucleus elongates, as- 
sumes a dumb-bell form, and divides transversely with the 
body. The newly separated zooid is entirely ciliated and with- 
out pedicle. 
In Sezence, October 18, 1883, I noted the discovery for the 
first time in this country, of the uncommon Phalansterium 
digitatum (Stein). Ihave recently taken the only other spe- 
cies of the genus, PA. consociatum (Cienk.), in the same little 
pool with the Zintinnidium. It is interesting that both these 
species should be on this side of the sea and not in England, 
where they have been searched for; and the fact seems of suffi- 
cient importance to be recorded here. 
TRENTON, NEW JERSEY. 
