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Show 198 MR. F. E. BEDDA.RD ON THE STRUCTURE [Mar. 5, xviith segment and are close together like the spermathecal pores. The integument surrounding them is raised into a ridge. From each pore protrudes the everted end of the spermiducal glands. The oviducal pore-for there is only one-offers a most remarkable case of asymmetry. In all three specimens there was but a single pore present, that of the left side. This pore is very conspicuous and lies just in front of the ventralmost seta of the fourteenth segment. There was no observable trace of a corresponding pore upon the opposite side of the body. A dissection (shown in text-fig. 55) sketched without any instructions shows plainly that the oviduct of the right side is abbreviated and only just reaches the body-wall. Naturally, this Text-fig. 55. V** $pgl Typhoeus nicholsoni. Genitalia, X 3. sp.s., sperm-sacs; od., oviducts; sp.gl., spermiducal glands. anomalous state of affairs was further investigated by section-cutting ; I found that the two oviducts had funnels of quite the same size, but that the lumen of the right oviduct gradually diminished, and that the tube ended blindly just at the body-wali, which it does not perforate. The wide lumen of the left oviduct, on the other hand, is very obvious where it perforates the body-wall. Alimentary canal.-The gizzard appears to occupy both the |