158 Miscellaneous. 
In some of the articular cartilages sometimes there are peculiarities 
of structure which I think have never been pointed out, and are 
worthy of notice. 
In the articular cartilage of the condyles of the os femoris, I have 
occasionally noticed numerous minute lacune?, found in greatest 
abundance near the surface of attachment, and gradually decreasing 
in number until they entirely disappear in the superficial third of 
the cartilage. They are elongated, compressed, and their long 
diameter is invariably situated transversely, at right angles to the 
filamentous matrix, or parallel with the surface of the cartilage. 
The longest measure transversely yg'j9 of an inch, the shortest 4,5 
of an inch, in the vertical direction z,5 of an inch. When well- 
defined, they appear more transparent than the cartilaginous matrix 
in which they are situated; when viewed a little within the focus 
they appear deep black. 
Fibres of bone are not unfrequently met with in the articular car- 
tilages, especially in that of the head of the os femoris. They are 
generally found near the surface of attachment, but are not the con- 
tinuation of the bony structure upon which the cartilage is placed, 
for they are always arranged in a direction parallel to the surface. 
They are compressed cylindrical in form, and in transverse section 
present an elliptical figure, the long diameter of which iz placed at right 
angles to the filaments of the cartilage matrix. ‘They present a con- 
centrically laminated and a radiated structure, resembling somewhat 
that of the Haversian ossicle, but they neither present the canal nor 
the Purkinjean corpuscles.—Proceedings of the Academy of Natural 
Sciences of Philadelphia, vol. iv. p. 117. 
NOTICE OF AN EXCAVATING CIRRIPEDE. 
On the 8th of last June Mr. Albany Hancock communicated to a 
Meeting of the ‘Tyneside Naturalists’ Field Club,” an account of 
an excavating Cirripede which he had recently discovered on the 
neighbouring coast. This animal possesses much interest, not only on 
account of the peculiar habit of burying itself in the shell of mollusks, 
but likewise for its remarkable deviation of form from all the known 
types of the class. No part of the animal, though unprovided with 
shelly plates, is exposed, except two lips which guard a small narrow 
opening in the surface of the substance in which the Cirripede is 
concealed. 
On the Arrangement of the Areolar Sheath of Muscular Fasciculi and. 
its relation to the Tendon. By Dr. Lerpy. 
It is well known that the fasciculi of fibres of the muscles are 
surrounded by sheaths of areolar tissue, but the arrangement of the 
filaments of fibrous tissue forming the sheaths, and their relation 
with the tendon, I think has not been properly pointed out. From 
repeated observation, I have found that the filaments of fibrous tissue 
cross each other diagonally around the muscular fasciculi, forming 
a doubly spiral extensible sheath. None of the filaments run in the 
direction of the length of the fasciculi, and but few are transverse. 
Many of the filaments of a sheath form an interlacement in the same 
diagonal manner with the filaments of the sheaths of neighbouring 
