1891.] MR, T. D. A. COCKERELL ON CLAUalLIA. RUGOSi. 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's ^ 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- Jackson^ 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 vrould serve much purpose until I 

 am in the position to describe a large series of specimens ; the varia- 

 tion 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 May 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 

 Olausilia ruffosa, Drap. (C. bidentata, Strom), and made the follow- 

 ing 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 importaBce of this furrow is shown by tlie 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. 



' Forms of Animal Life, 2nd ed. p. 369. 



Proc. Zoot.. Soc— 1891, No. X. 10 



