PROCEEDINGS OF SOCIETIES. 135 
median series of globular corpuscles, and usually with a pale 
space at the centre. 
Length of joint varying from ;}5 to zs mch; diameter 
at the middle of the joint, 3/55; just under the dilated 
extremity, z,';5 ; and of the extremity itself, <3'55 m. 
Although the compliment may be but an unpretending 
one, it affords me great pleasure to have the opportunity of 
associating the name of my friend, George Porte, Esq., with 
this species—a gentleman whose manipulative skill in its 
use is only equalled by his admiration of the many beautiful 
objects brought to view by the microscope—while it will be 
commemorative, too, of the origination and initiation by 
him of a series of pleasant re-unions, at once scientific and 
social, on the part of a limited little circle, in the number of 
whom it is my own esteemed privilege to be counted a unit. 
Another form to which I would next direct attention is 
one in which I find a single, but important, difficulty, in 
referring it to the genus Spherozosma, and it is the following : 
I cannot find either one or two “glandular processes” 
between the joints of the filament, the presence of which is 
one of the characters of the genus Sphzrozosma (Corda). 
The filament, which is very minute, is, however, plane and 
fragile; while the joints, which are about as broad as long, 
are constricted by a sharp, not deep notch at each side 
between the projecting lateral inflations at the base of the 
segments, giving a pinnatifid appearance to the margin of 
the filament, which thus possesses all the characteristics of 
Spheerozosma, save the one above noticed. Surrounding this 
form I do not think there exists a gelatinous sheath; but I 
am not able to affirm this at all confidently. The ends of 
the segments are straight and abruptly truncate, each in 
close apposition to the truncate end of the neighbouring 
joint, without the apparent intervention of any “ glandular 
processes.”, This form is very minute, and is very 
fragile; hence seldom found having more than fifteen or 
twenty joints in the filament, generally less; often one single 
cell only is met with. The endochrome is light green, and 
possesses a single “ vesicle’ (or corpuscle) at the centre of 
each segment. Its minute size, the absence of the conspi- 
cuous central solitary “ gland,” its truncate and square- 
angled (not rounded) ends, and the lateral pouting projections 
of each joint at the base of the segments, readily distinguish 
this form from Spherozosma vertebratum. It differs from 
Spherozosma excavatum, which it more nearly approaches in 
size, by its square ends and lateral protuberant inflations, 
with a sharp notch at the constriction at each side, and in 
