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(1) The sporozoa of Spatangoids, previously referred to Lithocystis schneideri, Giard, include at least five species. In addition to Giard's original species of Lithocystis it has been necessary to establish two others, namely, L. foliacea, n. sp., and L. microspora, n. sp. Further, the genus Urospora is also represented by two species which have not been recorded before, namely, U. neapolitana, n. sp., from Naples, and U. echinocardii, n. sp., from Plymouth. On the other hand, it has been shown that there is no such species as "Urosporasænuridis, " which has been ascribed to Tubifex by some authors. (2) The instances of so-called "solitary eucystment," of which Lithocystis is quoted in text-books as furnishing a clear case, are shown not to be normal stages at all, but necrotic specimens attacked by the phagocytes of the host. (3) In both Lithocystis and Urospora there is intercalated a stage--Prozygote--in which the cytoplasm of the gametes has fused and the tail of the spore has appeared, but the nuclei have not yet combined to form the syukaryon of the true zygote. (4) Iu Urospora, both the "male" gamete and the prozygote are flagellated and motile.

On the Life-History of the Sporozoa of Spatangoids, with Observations on some Allied Forms