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Show 1891.] MR. T. D. A. COCKERELL ON CLAU9IMA RUGOSV. 145 bends back. In the Kangaroo and Wallaby it is directed backwards, and apparently also in the Koala. The fissure which separates the anterior lobe of the cerebellum is directed forwards in the Thylacine \ but is nearly vertical in the Kangaroo and Wallaby, though with a decidedly forward inclination. I do not feel able at present to identify any of the remaining fissures of the Thylacine's brain with those of the Kangaroo. With regard to the other viscera, I have not much to add to Prof. Cunningham's2 excellent account ; I may remark, however, that one of the papillary muscles connected with the right auriculo-ven-tricular valve is attached to the free wall of the ventricle. I call attention to this point since Mr. Hatchett-Jackson3 has particularly mentioned as a characteristic of the Marsupials that all these muscles arise from the septal part of the ventricular wall. I have preserved a record of the number and arrangement of the papillary muscles in order to compare them with those of other Marsupials. I do not, however, think that a description would serve much purpose until I am in the position to describe a large series of specimens ; the variation in these muscles from individual to individual needs to be first discounted. February 17, 1891. Prof. Flower, C.B., LL.D., F.R.S., President, in the Chair. Mr. Edward Gerrard, Jr., exhibited a very fine head of a Koodoo Antelope (Strepsiceros kudu). The specimen had been shot by Mr. F. C. Selous, near the River Macloutsie, Khama's Country, South Africa, on M a y 23rd, 1890. The length of the horns was 3 ft. 9| in. on one side, and 3 ft. 9 in. on the other, measured in a straight line from the base to the extremity. Mr. T. D. A. Cockerell exhibited some abnormal specimens of Clausilia rugosa, Drap. (C. bidentata, Strom), and made the following remarks:- The specimens exhibited were all found in the same place, at the base of a wall, at Isleworth, Middlesex, on Feb. 15th. The specimen with the two apertures (figs. 1, 2, p. 146) shows a curious result of a fracture of part of the body-whorl behind the original mouth of the 1 The importance of this furrow is shown by the fact that it is the most prominent one next to the rhinal fissure in the Opossum. See Appendix to Dr. Elliott Coues's paper "On the Osteology and Myology of Didelphys vir-giniana," Mem. Bost. Soc. Nat. Hist. 1872, by Dr. Wyman, where a figure will be found. 2 In Zool. Chall. Exp. vol. v. 3 Forms of Animal Life, 2nd ed. p. 369. PROC. ZOOL. Soc-1891, No. X. 10 |