TRANSACTIONS OF THE SECTIONS, 135 
Jersey consist chiefly of clean primitive rocks, which form little débris and no mud. 
Turbid water is unfavourable to growth, by intercepting the light as well as by its 
mechanical effects on delicate organisms. 
The method by which Miss Dyke Poore prepares the specimens so as to preserve 
their colour and minute structure so parisctly is not novel, but may be referred to 
this principle—that as these delicate forms and organisms are developed and sup~ 
‘a in a medium of nearly the same specific gravity as their own, so they must 
e kept disentangled and cleansed as much as possible in sea-water, and transferred 
to fresh water for the purpose of washing away the salt and of laying them out 
only immediately before the processes of drying and pressing. Thus prepared, and 
fixed by a slight brushing of skim-milk or weak solution of isinglass, they may be 
hep in a book, or sent by post between pasteboards without damage; but light 
and damp may still injure them, 
ZooLoey. 
[For Dr. Hooker’s Address see page 102.] 
On some Points in the Histology of Myriothela phrygia*. 
By Prof. Atuman, 2S. 
The endoderm of that portion of the body which lies at the distal side of the 
gonosome, and which carries the Pe tentacles characteristic of the genus, 
is composed of numerous layers of large polyhedral cells with clear contents and a 
brilliant nucleus. Internally it forms thick conical processes which project into 
the body-cavity, while externally it is continued in an altered condition into the 
tentacles. At the free end of the internal processes there are abundantly developed 
among the large clear cells smaller spherical cells filled with opaque brown granules. 
These cells are easily detached and isolated, and may be then seen lying free in the 
body-cavity. Where the endoderm passes into the cavity of the tentacles, it loses 
its large clear-celled condition, and consists of small round cells loaded with opaque 
brown granules. 
External to the endoderm and interposed between this and the ectoderm 
is the fibrillated layer. This is remarkably well developed. Its component- 
fibrillz run circularly round the body, and form a continuous fibrillated mem- 
brane so strong as to remain entire after the tissues on both sides of it have 
been broken down. No obvious membrane distinct from this and forming a sepa- 
rate “ Stiitzlamelle” could be detected. It is continued as a thinner membrane 
into the tentacles, where it lies between the endoderm and ectoderm of these 
processes. 
The ectoderm is mainly composed of two or three layers of small round cells 
filled with yellowish granules. Among these cells the thread-cells may be seen 
lying at various depths from the surface. The ectoderm retains this structure over 
the body and tentacles; but between the proper ectoderm and the fibrillated lamina 
of the body a peculiar tissue may be demonstrated. This consists of a layer of cells, 
from each of which there proceeds a fine process which can be distinctly traced 
into the fibrillated membrane. In this membrane the cell-processes lose them- 
selves ; and they could not be followed into direct continuation with the fibrille in 
the way in which Kleinenberg traced the prolongations of cells apparently having 
the same significance in the ectoderm of Hydra. These cells differ also from those 
described by Kleinenberg in Hydra in their being nowhere superficial. In a trans- 
verse section of the body in Myriothela the caudate cells form a distinct zone 
immediately external to the fibrillated lamina and between this and the proper 
ectoderm. They are strongly stained by magenta, while the fibrillated membrane 
takes up scarcely a trace of the colour. It is impossible not to see in this tissue 
elements referable to a very primitive type of the nervous system. 
-* [Received after the close of the Belfast Meeting. Printed with the authority of the 
Council.—G. G.] 
