Miscellaneous. 415 
Prof. Harkness, whose connexion with the Lake-district and its 
geology renders such a commemoration on the part of the Cumber- 
land Association peculiarly graceful aud appropriate. Mr. Good- 
child has had access to many letters addressed to Prof. Harkness by 
distinguished geologists at home and abroad; and his long extracts 
from these give additional value to his memoir. 
Besides the formal papers above mentioned, the part contains a 
set of “ Local Scientific Notes and Memoranda,” relating chiefly to 
various: minor matters of natural history, some of which may have 
interest for students outside the district. Not content with having 
written the longest article in the book, the Editor is the principal con- 
tributor of these short notes, and, indeed, throughout he seems to 
have performed his duties in an energetic and conscientious manner, 
which has naturally led to the production of a most respectable and 
valuable volume. 
MISCELLANEOUS. 
On the Structure of the Otocysts of Arenicola Grubii, Clap. 
By M. E. Jourpan. 
Tne author’s investigations were made upon the small Arenicole 
of the coast of Marseilles and in the laboratory of that place. 
By sectioning the cephalic segment of an <Arenicola previously 
fixed by the injection of a solution of osmic acid of 0°50 per cent., 
the auditory capsules were shown in some sections and easily 
recognized by their little calcareous corpuscles. The otocysts are 
situated in the thickness of the integuments far from the hypodermis 
and in the midst of muscular bundles; they are fixed by the con- 
nective envelope of these bundles, which surrounds them. They are 
not in direct contact with the cesophageal commissures, but connected 
with them by several nerves. They are placed towards the dorsal 
surface. 
The nerve-fibres composing the commissure and the brain are 
very fine and striated longitudinally. Nerve-cells exist throughout 
the length of the commissure, some in its interior, but a much 
greater number between the commissure and the hypodermis, often 
intimately connecting these two parts. 
The otocysts are spherical. The diameter of their cavity is ;)), 
millim. and that of the sphere formed by the outer capsule ;22, mil- 
lim. The thick walls consist of a layer of fusiform cells, a network 
of fibrille arranged in a dense plexus, and a connective envelope. 
The cells form the greater part of its thickness ; they are very deli- 
cate, spindle-shaped, slightly inflated towards the middle, where the 
nucleus is situated; they also increase in thickness towards their 
inner extremity, where they are surmounted by a thick plate. The 
plates of all the cells are closely soldered together, forming a cuticle, 
which, in sections, is often detached from the cells which produced 
