A. C. Stokes—Fresh-water Infusoria. 317 
obtain one of these beautiful polythecia exhibiting more than. 
the thirty-one which composed the colony shown in the figure. 
The loric#, like those of Bicoseeca lepteca referred to on a pre- 
vious page, are remarkable for the great apparent facility with 
which they change their hyaline condition to a translucent but 
deep chestnut-brown coloration. As in the Bicosoeca, again, 
this is occasionally accomplished so early that in some poly- 
thecia, although the terminal loricae have seemed to be incom- 
piete, yet their posterior portions have become brown while 
the remainder, apparently in process of formation, has been 
colorless and transparent. 
n general appearance this form resembles Stylobryon petio- 
latum, differing, as has been stated, in being less variable in the 
manner of building up its polythecium, in the shape and pos- 
lerlor position of the enclosed zooids, in the more conical form 
f the individual loricee, and especially in their much smaller 
Ze, those of § petiolatum measuring from x4, to shy inch, 
while With the present species none greater than 54,5 inch have 
en observed, 
{ gives me pleasure to dedicate the species to my friend Dr. 
Charles QC. Abbott, the well-known archeologist and naturalist, 
see 
Since its batiint was the still waters of that attractive region, 
the vertebrate life of whose upland and meadow Dr. Abbott 
has described so charmingly in his ‘Aambles of a Naturalist 
Mout Home,” and on whose fields and hillsides he has discovered 
= Many evidences of paleolithic occupants, and so many 
Pecimens of their handiwork. 
Titina helia, sp. nov. 
] Body somewhat bean-shaped, or sub-elliptical with an anterior- 
J Situated ventral concavity ; twice as long as broad, slightly 
aad posteriorly, longitudinally striate and entirely ciliate, the 
1a of t i * 5 
‘}Ssicle single, sitwated back of the body-centre in the right-hand 
lateral border, often leaving after systole a rosette of small 
Yacuoles which finally coalesce; anal aperture opening on the 
Ventral surface near the posterior extremity ; nucleus large, 
ete, subcentrall y situated. Length of body s};incb. Habitat. 
landing water, with Alga. 
Although the nucleus is correctly referred to as being sub- 
“entrally placed, its position in reference to any special region 
M. JOUR, Sct.—Turrp Serres, VoL. XXIX. No. 172.—ApRib, 1885. 
22 
