44 Dr. D. Bergendal on the Land-Planartce. Scytonema pentcillaium, Ag. Ferguson ! Geogr. distr. Blekingia. Lynghya majuscula^ Hook. Harvey ! No. 84. Geogr. distr. Mauritius, Socotra {Balfour' !), Europe, North America, Bermuda, Martinique. Trichodesmium erythrceuniy Ehrenb. Ferguson ! Geogr. distr. Bed Sea, Indian Ocean, Chinese Sea. HyphcBothrix confervce^ Kiitz. Ferguson ! Geogr. distr. Germany. Cylindrospermum macrospermum, Kiitz. Ferguson ! Geogr. distr. Throughout Europe. IV. — Contribution to the Knowledge of the hand-Planarice. By Dr. D. Beegendal *. In the orchid-house of the Botanic Garden in Berlin some Bipalia were observed last autumn. These have since greatly multiplied there, and I have made a careful investigation of them in the Berlin Zoological Institute. In 1878 Moseley described f Bijpalium Icewense from the hothouses of Kevv Gardens. The form here observed seems to be identical with this, although the ground-colour of the back is usually more of an olive-green and the streaks are almost quite black. The head is comparatively small, with a dark crescent upon the upper surface. The mouth is situated further forward than in most other Bipalia, at the anterior end of the second third of the body. The animals found are all without any developed sexual organs. Only in one animal have I been able to interpret some small aggregations of cells in the sec-tions as the rudiments of testes. Of the oviducts and vasa deferentia I have never observed any traces. In other Bi-* Translated from the * Zoologischer Anzeiger/ No. 249, April 18, 1887, pp. 218-224. t Ann, & Mag. Nat, Hist, ser, o, vol. i. p. 238,
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