114 H. CHARLTON BASTIAN ON THE STRUCTURE AND 
so-called nervous cords, we meet with vessels that do not contain a trace of the charac- 
teristic fatty particles met with in Ascaris*. 
Filaria medinensis would seem to present us with a higher type of development, in 
which lacunar channels in the axis of peculiar **fat-canals" are replaced by distinct 
walled vessels. 
Glandular System.—Lining the whole interior of the body is a bed of pulpy granular 
matter, containing numerous interspersed gland-cells. This system is most highly 
developed dorsally and ventrally, especially in the anterior part of the body, where it is 
situated on the corresponding muscles, and forms distinct circumscribed projections ; 
but in the lateral regions, where it lies on the inner layer of integument, no regular pro- 
jections can be seen. In both situations its inner boundary, or investing membrane, 
seems formed by the peritoneum lining the general cavity of the body. 
For about two inches from the anterior extremity, over the dorsal and ventral muscles, 
well-marked glandular processes (Pl. XXII. fig. 29) are met with, projecting into the 
cavity of the body. They vary much in shape as well as size, being either flask-like, 
ovoidal, oblong, or quite irregular in form; and whilst those situated in the middle line, 
next the dorsal and ventral vessels, are very small, they gradually enlarge outwards 
towards the free borders of the muscles. 
To the naked eye and by reflected light these processes are of an opaque milk-white 
colour ; but when examined under the microscope by transmitted light, each is seen to be 
composed of a very delicate limiting membrane containing fine granular matter and a 
distinct spherical cell varying from 4455th to 4i5th of an inch in diameter, more 
densely crowded with the granular material, and having a central dot or nucleus about 
zogoth of an inch in diameter (Pl. XXII. fig. 30). These projections are apparently 
connected at their base with an areolar arrangement of filamentous tissue, lying on the 
surface of the muscles—the areolæ corresponding in size with the processes with which 
they are connected. | 
Sometimes near the posterior extremity distinct projections are also met with; but 
throughout the greater portion of the body the muscles are lined with a comparatively 
smooth layer of more equal-sized glands, having a beautiful mosaic-like arrangement 
(Pl. XXI. fig. 27). Where much pressed upon by the distended genital tube, this layer 
wholly disappears (Pl. XXI. fig. 20). 
Opposite the lateral spaces I have not been able to trace any arrangement into separate 
glands, the highly granular nucleated cells in that situation seeming to be dispersed, at 
intervals, through a thin stratum of the pulpy substancet, though, from a figure given 
by Carter in the Transactions of the Bombay Medical Society, I imagine the tessellated 
* "There is just & possibility that these dorsal and ventral vessels of the Guineaworm may be collapsed canals from 
which all the fatty particles have been absorbed, as is stated to occur late in life in Oxyuris ornata ; but all I can say 
is, that such absorption does not take place in Ascaris lumbricoides, as I have never seen any difference in the 
quantity of these fatty particles in many specimens that I have examined ; neither can they have been dissolved out by 
م‎ as they may be found as numerous as ever in specimens of Ascaris which have been three times as long in . 
spirits of wine as the Guineaworms examined. 
T Near the tail and in other parts of some of the specimens examined, the only trace of these cells was a faint oval 
or circular outline, with one or more bright, highly refracting bodies enclosed. 
