472 WILLIAM A. HASWELL. 
As regards its general form and appearance, this gizzard (fig. 
1, g.) is a longer or shorter, straight cylinder, connected 
directly with the walls of the body only by two long, narrow 
bands of muscle (pr.), which pass from its posterior end 
forwards to become connected with the walls of the buccal 
segment, and act as protractors of the whole proboscis. Along 
each side of the cylinder runs a narrow longitudinal line which 
is lighter in colour than the rest of the surface. When 
examined under the microscope the whole wall of the organ is 
seen to be crossed by a series of fine parallel transverse lines, 
the number of which varies considerably in different species. 
The band-like spaces between these lines, again, are subdivided 
by a number of still finer cross lines into a series of (usually) 
squarish arez, in the centre of each of which is a rounded spot 
which differs in colour from the rest. In preserved specimens 
these spots project as minute papillz on the external surface of 
the organ. In some parts of the surface this arrangement of 
the parts is departed from, the aree composing the transverse 
rows being hexagonal and being divided through the central 
spot by the transverse line. 
In most of the interpretations of those appearances which 
have been published by previous observers I find a singular 
unanimity on one point, viz. the presence of transverse rows of 
glands, corresponding to the transverse rows of dots above 
referred to. In his masterly essay on all that was then known 
(1851) on the anatomy and physiology of the Annelida, 
Williams makes the following observations on the organ under 
consideration. 
“To the cesophagus in all Syllide succeeds an elongated 
highly glandulated gizzard-like portion peculiar to and charac- 
teristic of this genus (fig. 59, d). The parietes of this portion 
are perhaps not dense and muscular enough to claim for it the 
character of a true gizzard. The glandules are arranged in 
transverse or circular rows, and communicate with the interior 
by means of a minute excretory tube or orifice.’”} 
1 “On the British Annelida,” ‘ Report of the British Association for the 
Advancement of Science,’ 1851, p. 234. 
