24 ` Infusoria from Fresh Water. [ January, 
them anon streaming wildly as the waters sank below the stone, 
only to dash them upward again as the waves rushed back. 
Scarcely thinking to obtain any animal life clinging to a plant 
that rejoiced in such swirling turbulence, I gathered the weed 
while my friend adhered to the extremities of my coat as desper- 
ately as the Alga adhered to that limestone rock. The plant, as 
the Rev. Francis Wolle, of Bethlehem, Pa., tells me, is Cladophora 
glomerata Linn.; the undescribed form of Zoothamnium, unex- 
pectedly found in thrifty abundance on the lower branches, is 
Zovthamnium adamsi, sp. nov., named for the Rev. J. E. Adams, 
Fic. 8.—Zosthamnium adamsi, sp. nov. 
of Olean, N. Y., a cultured and eloquent gentleman, who assisted 
in its capture. 
So far as external form is concerned the members of this col- 
ony resemble those of Saville Kent’s Z. simplex, a company of 
elongated zooids clustered at the summit of a smooth, unbranched 
stem. Both are conical, both are widest at the frontal border, 
both are tapering and attenuated toward the insertion of the ped- 
icel, but here the resemblance ceases. The cuticular surface of 
the new form now referred to is not smooth, as is that of every 
other recorded fresh-water species, but is finely and delicately 
striated transversely. So closely approximated and so tenuous 
are these elevations that it is only after the most careful scrutiny 
under an amplification of not less than 400 diameters, that they 
