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Our patient was a 69-year-old woman admitted to our hospital for heavy proteinuria and hematuria. A renal biopsy showed findings similar to those of membranoproliferative glomerulonephritis associated with nodular lesions, and immunofluorescence showed marked deposits of IgG, C1q, and C3 on the peripheral capillary walls. IgG3 alone was observed on IgG subclass staining with no κ or λ light chains, and Congo red staining was negative. These findings suggested IgG3-heavy-chain deposition disease (HCDD). However, we did not find a deletion of the first heavy-chain constant domain, which is commonly observed in HCDD. Electron microscopy showed randomly arranged subendothelial microtubular structures with diameters of 70–90 nm. Altogether, the diagnosis of HCDD could not be made, although monoclonal IgG3 deposits in glomeruli were observed. This is the first case report of monoclonal IgG3-heavy-chain glomerulonephritis with subendothelial-based, randomly arranged microtubular structures with diameters of 70–90 nm.

Tsushima has often been wrongly treated as two islands, for it appears as if divided into two parts by an inlet "As6-wan," which extends from west to east deeply into the land. These two parts thus separated, however, are united by a narrow isthmus, though there exist two canals connecting the waters of east and west coasts of the island. Therefore, each of the two parts is not in itself a complete and independent island, and the whole Tsushima is but a single mass of land that lies in the midst of the Korean Straits. As administrative district, the northern half is called "Kamiagata," and the southern half "Shimoagata." Such is Tsushima, and from geographical, geological, and as well as from faunal and floral points of view, this island does not belong to Kyuishfi proper as Iki does. A mere observation of the fauna of Tsushima reveals a very complicated phase, a mixture of two types, those of Kyfishfi and those of Korea. As to Hynobius, a urodelan genus, which I am now treating, I found a feature peculiar to this island and entirely different both from those of Kyfishfi and Korea. It has been known that in Tsushima lives a kind of Hynobius. In 1907, Stejneger and Tago acknowledged it as H. nebulosus (Schlegel), but Abe, in 1922, named it H. tsuensis, a new species. On the other hand, Dunn, in 1923, from an examination of only a single individual obtained from the northern half, considered it as a new species, differing from tsuensis chiefly in its color pattern, and named it H. tagoi. It is his view that this species is restricted to the northern half of the island, and H. tsuensis to the south. For this reason he regards Stejneger's specimen as referable to tagoi. .