434, Dr. F. Miiller on Philomedusa Vogtii. 
anterior extremity, but there remains here a round aperture in 
each, serving as a communication between every two adjacent 
chambers. In this way a sort of annular canal is produced 
round the mouth at the base of the tentacles. The partitions 
are seldom seen perforated with holes in other places. Pos- 
teriorly the partitions are continued, following the longitudinal 
furrows, to the extremity of the body; but beyond the stomach 
they form very inconsiderable projections into the general cavity. 
They seem to be formed of two lamelle,—at least, when looked 
at straight from the outside, they appear like two dark stripes, 
separated by a narrow, pale, intermediate one. 
From their insertion upon the stomach to the beginning of 
the hindmost third or fourth of the length, the partitions are 
bounded by a broad, yellowish, moderately opake border, folded 
in an undulated or frilled manner, of which the margin floating 
freely in the body-cavity is thickened into pads or cushions. 
On this margin, about 0-1 millim. in breadth, and which is 
sharply separated from the frilled portion by a paler line, the 
ciliary movement is particularly lively; and an abundance of 
thread-capsules, of twice the length and thickness of those oc- 
curring in the external integument, are imbedded in it. These 
twelve frills differ in their anterior and posterior extension, and 
thus show still more distinctly the bilateral symmetry already 
indicated in the formation of the mouth, in relation to a plane 
drawn through the axis of the body and the oral channel. When 
considered in their posterior extension, the first, third, and fifth 
pairs (counting from the side of the oral channel) constantly 
appear to be the longest, the sixth pair is of intermediate length, 
and the second and fourth are the shortest. The two latter 
pairs, on the contrary, reach furthest anteriorly, the partitions 
belonging to them descending’ only to about the middle of the 
stomach; the third, fifth, and sixth pairs are inserted at the 
bottom of the stomach, whilst the two partitions of the first pair 
form a chamber closed towards the interior above the stomach. 
I believe that we may regard the thickened margins of the frills 
as analogous to the mesenteric filaments of the Actinie, which 
here only exhibit the peculiarity of being attached throughout 
their whole length. The frills themselves may prove to be the 
place of formation of the sexual materials, of which I have been 
unable to find any indubitable traces in numerous animals exa- 
mined in the course of nearly a year. 
In the larger Actinie the existence of small apertures in the 
cavity of the body is usually betrayed only by the squirting-out 
of fine streams of water when the animals are seized ; in our 
animals these orifices themselves are easily detected. They ap- 
pear, even to the naked eye, as ¢welve radiating rows of pale dots 
