WILLIAMS: BOOPHILUS ANNULATUS. 
331 
eggs almost to the destruction of other organs. The alimentary 
diverticula lie against the outer walls of the body or against support¬ 
ing muscle fibers. Their cavities are entirely suppressed although 
the triangular cells, which are assumed to be liver cells (pi. 20, fig. 
11, cl. hep.), are still evident. The tracheae are proportionately 
much less important. Only the muscles and the Malpighian tubules 
with their contents of shining granules occupy large spaces still. 
shy/- 
The Malpighian tubules are larger in proportion to the whole animal 
and therefore much larger absolutely than in smaller specimens. 
One or two of the eggs in this section dropped out and left the 
cavities as indicated in the figure. Except for these the section 
is perfect and well illustrates the relative sizes of eggs and other 
organs. 
Male Reproductive System. 
The male reproductive organs are bilateral and are shaped some¬ 
what like the ovaries of Ixodes ricinus as figured by Pagenstecher, 
but not at all like the male organs figured by him. They also resem¬ 
ble in shape the male organs of Uropoda as reproduced by Lang, 
(’94, p. 553, fig. 377) after Winkler. 
There is first a heavy-walled mass just back of the sexual opening 
which I have labeled })e. (pi. 22, fig. 25) though there is no evidence 
that it is an extrusible organ. At the sides of this come the vasa 
deferentia. Posterior to the thick-walled mass in the midline is a 
system of sacs running as far as the anal opening and with diverti¬ 
cula even farther back. A section shows that these sacs are seminal 
vesicles (pi. 22, figs. 23, 25, sem. ves.). The sperm contained in 
