PACIFIC COAST OLIGOCH MTA, 79 
tain comparatively few blood glands, others three or four times as many. They 
are of all sizes and shapes, as Perrier has shown. Some contain only one single 
nucleus, then frequently surrounded by a blood clot; others again contain a very great 
pumber of nuclei, which are then situated in a sac-like pocket at the end of the blood 
‘apillary. In some of the larger blood vessels in the salivary gland the blood gland 
takes the form of a “hertzkérper.’ The smaller ones situated on the capillaries 
may be named terminal blood glands, while those situated inside the larger vessels 
may be designated interior blood glands. The structure of the two are at least in this 
species very similar, 
In fig. 73, a. to s., [ have endeavored to illustrate the structure of these blood 
glands from sections. In g.a large blood vessel with a blood clot, at the base of which 
is an inner blood gland. On one side of the blood vessel is a part of a salivary gland 
with brown secretions. In a. a small terminal blood gland is shown, and in 0. and e. 
some of a greater development. The nuclei are not always surrounded by a distinct 
cell membrane, in fact in almost every gland are found some nuclei with distinct cell 
membranes while others lie loose in the granular serum. The exterior line in all 
the figures represents the wall of the blood vessel, and the difference between the 
terminal and inner blood glands consist in reality only in the absence or presence of 
blood surrounding the glands. As far as the granular protoplasm concerns it is always 
differentiated in two parts. The one at the distal extremity is more evenly dif- 
fused and finer grained than the one next the capillary, which again is coarser, streaky 
and which, besides, stains differently or at least more intensely than the other. Many 
of the glands contain larger or smaller bodies (p., ¢. and 0.) equally of round form 
and lighter in color than the cytoplasm, but sometimes they are very opaque, stain- 
ing deeply as at r., the two classes probably being of entirely different character. 
The former resembles a pale nucleus, while the latter opaque bodies appear only to be 
secreted matter. The paler ones may possibly be parasitic protozoa. 
The blood glands described by Claparede, Lankester and others in Lumbricus, 
ete., are probably of a similar construction, and judging from the figure given by 
Michaelsen of the “ hertzkérper” in Enchytreeus, we may conclude that it, too, is 
identical with the blood gland in Pontodrilus. 
Spermathece (figs. 30, 55, 56, 57, 58). There are two pair of spermathecz 
found in somites viii and ix, the exterior pores being as usual in the intersegmental 
grooves between vii/viii and viii/ix in line with sete 2. Hach spermatheca possesses 
a tubular diverticulum, the junction of the two being in the body-wall. The position 
of the diverticulum is always ventral to the spermathece proper. This is cylindrical, 
quite narrow, with a larger globular chamber at the free inner end, in which the wall 
is much thinner than in the cylindrical part. At the junction with the body-wall 
is a much larger swelling, the lower and more strongly muscular part of the main 
cylinder being greatly widened, presenting a muscular cushion partly projecting above 
the body-wall, partly again being immerged in it. The spermatozoa are principally 
massed in the inner globular chamber, though they are seen also in the diverticulum. 
