Noland—Anatomy of Troctes Divinatorius Muell. 
201 
the digestive tract is made up largely of brown crystals. The diet 
on the whole appears to be gained from the organic material in 
particles of dust^ rather than from gnawing portions from dried 
grain or specimens. Frequently the mid-intestine is found to be 
two-thirds filled with large gregarines, the only parasites discov¬ 
ered in the digestive tract. 
The hind-intestine is at its beginning much narrower than the 
mid-intestine. The anterior portion, or ileum, is the longest part, 
and is coiled once toward the dorsal wall of the abdomen. Imme¬ 
diately after coiling, the ileum enlarges into the short, broad rec¬ 
tum (fig. 7, rg.) which is fully as wide as the mid-intestine. Its 
walls contain four swellings which, in section, appear to be glandu¬ 
lar. These rectal glands are composed of large cells with large 
nuclei, and both cells and nuclei stain heavily. The rectum nar¬ 
rows abruptly before it opens to the outside in the ninth segment 
of the abdomen. 
At the beginning of the ileum four Malpighian tubules (fig. 7, 
m.t.) open. These extend anteriorly half or two-thirds of the 
length of the abdomen. Each tubule stretches anteriorly for about 
half of its length and then doubles back on itself, coiling about, 
with its blind end in the posterior part of the abdomen, near the 
rectum. 
The Female Reproductive System 
The two ovaries of the female reproductive system of Troctes, 
lying one on either side of the mid-intestine and between the intes¬ 
tine and the dorsal wall of the abdomen, are each made up of five 
ovarian tubules (fig. 9, o.). Each tubule is of the type in which 
nutritive cells alternate with egg cells. The young oocyte (fig. 11, 
ov.) is found at the proximal end. Distal to it in the tubule are 
three or more large nutritive or nurse cells (fig. 11, n.c.) in a sin¬ 
gle chamber which supply nutriment to the oocyte. The apex of 
the ovarian tubule forms a terminal chamber (fig. 11, t.c.) contain¬ 
ing a mass of undifferentiated cells, and the tubule terminates dis- 
tally in a long terminal filament which unites with those from the 
other ovarian tubules to form a single filament (figs. 9 and 11, f.) 
that serves to hold them in place in the abdomen. The proximal 
ends of the tubules are long and slender and unite to form the two 
short oviducts (fig. 9, od.) which join almost immediately in the 
broad vagina (fig. 9, v.) that opens to the outside at the posterior 
