80 PROF. G. ELLIOT SMITH OF 



along the ventral wall of the rectum ; at the second curve, which 

 forms a sharp kink, two muscular bands or retractors are attached, 

 the other ends of which run to the ventral wall of the rectum. 

 On each side of the rectum are situated four glandular masses of 

 spherical shape. Three of these (a, /3, and y) are shown in the 

 diagram (fig. 10) ; the fourth one is small and is hidden by the one 

 marked 7. On section y shows a series of concentric fibrous 

 planes of a pale colour, while the darker soft tissue between is on 

 microscopic examination seen to be glandular. Prof. A. H. 

 Young has referred in detail to these bodies in the Koala (Journ. 

 Anat. & Phys. vol. xiii. p. 316), and he has pointed out that, 

 while three of them are Cowperian glands, the fourth (corre- 

 sponding to a in fig. 10) is one half of the divided corpus 

 spongiosum. This conclusion a section of o compared with that 

 of y seemed to bear out, though the specimen had not been 

 well enough preserved for careful microscopic study. 



further Notes on the Lemurs, with especial Eeference to the 

 Brain. By G. Elliot Smith, M.C (Communicated by 

 Prof. G-. B. Howes, D.Sc, LL.D., F.E.S., Sec.L.S.) 



[Eead 5th March, 1903.] 



(With 4 text-figures.) 



Since my memoir on the Prosimian brain was presented to the 

 Society *, 1 have come into possession of some valuable material 

 which is of sufficient interest to call for these additional notes. 

 At the same time, I shall avail myself of the opportunity of 

 referring to some interesting communications of Hubrecht t and 

 Earle J, with which I was not acquainted when my memoir was 

 writtei). Professor Howies has called my attention to these, and 

 generously lent me copies of them. 



* Trans. Linn. Soc., Ser. II. Zool. vol. viii. pp. 319-432. Eeferences in this 

 paper under " Mem." refer to the illustrations of the memoir. 



t A. A. W. Hubrecht, "The Descent of the Primates," Princeton Lectures, 

 New York, 1897. (Compare also " Die Keimblase von Tarsius," Festschrift 

 fiir Carl Gegenbaur, Leipsig, 1896.) 



j Charles Earle, "The Lemurs as Ancestors of the Apes," 'Natural 

 Science,' vol. x. no. 63, May 1897. 



Id., "On the Affinities of Tarsius: a Contribution to the Phylogeny of 

 the Primates," The American Naturalist, vol. xxxi. July 1897, pp. 367 et seq. 



