1903.] ON POLYCLADS FROM ZANZIBAR AND BRITISH E. AFRICA. 99 



16. Davenport, C. B. " Review of von Guaita's Experiments in 



breeding Mice." Biol. Bull. 1900, ii. p. 121. [Interesting 

 as a careful attempt to discuss the facts before the Mendelian 

 principles were rediscovei-ed.] 



17. Day, J. R. Monthly Homceop. Rev. Lond., 1897, xli. p. 148. 



[Case of albinos from parents who were first cousins.] 



18. ' Fancy Mice.' Anonymous. London (Upcott Gill), pp.4, 5. 

 [Contains also Carter Blake's notes, pp. 14-23.] 



19. VON GuAiTA. " Versuche mit Kreuzungen von verschiedenen 



Rassen der Hausmaus." Ber. naturf. Ges. Freiburg-i.-B. 

 1898, X. p. 317. 



20. Ibid. 1900, xi. p. 131. 



21. Haacke, W. " TJeber Wesen, TJrsachen, und Vei-erbung 

 von Albinismus, &c." Biol. Centralblatt, 1895, xv. p. 45. 



22. Pickering, J. W. " Coagulation in Albinos." Jour. Phys. 



1896, XX. p. 310. [Full references.] 



23. Seligmann, C. G. "A Note on Albinism." Lancet, 1901, 



Ixxx. p. 803. 



24. Weldon, W. F. R. " Mendel's Laws of Alternative Liheri- 

 tance in Peas." Biometrika, 1902, i. p. 244, [Refers to 

 Johann von Fischer's testimony.] 



25. ' N"ature,' 1903, Ixvii. pp. 512, 610; Ixviii. p. 34. 



26. ZoTH, 0. " Ein Beitrag zu der Beobachtungen und Yersuchen 



an japanischen Tauzmiiusen." Arch. ges. PhysioL 1901, 

 Ixxxvi. p. 147. [Full references to Cyon, Rawitz, &c.] 



27. CuENOT, L. " L'Heredite de la Pigmentation chez les Souris." 



Arch. Zool. exp. (4) 1903, vol. i. no. 3. 



28. Darbishire, A. D. " Third Report, &c." Biometrika, 1903, 



ii. pt. iii. 



29. Weldon, W. F. R. " Mr. Bateson's Revisions of Mendel's 



Theory of Heredity." Biometrika, 1903, ii. pt. iii. 



4. On the Marine Fauna of Zanzibar and British East 

 Africa, from Collections made by Cyril Crossland in the 

 Years 1901 and 1902.— Turbellaria Polycladida. Part I. 

 The Acotylea. By F. F. Laidlaw, B.A. Cantab., 

 Assistant Demonstrator and Lecturer in Biology in the 

 Owens Colleo-e *. 



[Received May 25, 1903.J 



(Plate IX. t & Text-figures 3-7.) 



Mr. Crossland's collection contains, so far as the Acotylea are 

 concerned, specimens of four new genera and eight new species out 

 of a total of nine species in all. This high percentage of novelties 

 is not surprising when one remembers that but little is known of 



* Communicated by the Seceetaey. 



t For explanation of the Plate, see p. 113. 



