1888.] 



7 he Placentation of the Lemurs. 



277 



Cervical nerves. 



Reference. 



Views previously 

 held. 



Authors' views. 



II. 



III. J 



II (alone). 



All authors. 

 Volkmann, loc. cit 



Hermann. loc.~) 

 cit. 



Quain, loc. cit. 

 Bastian, loc. cit. 



Other authors. 

 Volkmann, loc. cit. 



Ml save posterior 

 neck muscles. 



Stei*no-hyoid and 

 sterno-thyroid sup 

 plied. 



Supply" infra- 

 hyoid muscles 

 with descendens 



Supplies the small 

 muscles of neck, 

 but not the de- 

 pressors of hyoid. 



I. Depressors of 

 hyoid, especi- 

 ally sterno- 

 hyoid and 

 sterno-thyroid. 



II. Depressors of 

 hyoid, especi- 

 ally omo-hyoid. 



III. Nil motor. 



II. " An Additional Contribution to the Placentation of the 

 Lemurs." By Professor Sir Wm. Turner, Knt, M.B., 

 LL.D., F.R.S. Received May 21, 1888. 



In 1876 I contributed to the Royal Society a memoir " On the 

 Placentation of the Lemurs," which was published in the ' Philoso- 

 phical Transactions ' of that year (vol. 166, Part 2). The gravid uteri 

 which I examined and described were from specimens of Propithec?is 

 diadema, Lemur rufipes, and Indris brevicaudatus. The examination 

 showed in these Lemurs that the placental villi were diffused over the 

 greater part of the surface of the chorion, so as to approximate in 

 general plan with the arrangement in the Pig, Mare, and Cetacean, 

 though of course with special characters of their own ; that there 

 were also distinct areas on the chorion free from villi ; that the 

 uterine mucous membrane possessed multitudes of crypts, from out 

 of which the villi were easily drawn ; that smooth patches of mucous 

 membrane devoid of crypts, and corresponding to the non- villous 

 parts of the chorion were present, towards which the stems of the 

 uterine glands converged in a remarkable manner, and on the surface 

 of which they opened by obliquely directed mouths in considerable 

 numbers. Further, it was pointed out that the chorion occupied both 

 horns of the uterus, though the part which was prolonged into the 

 non-gravid horn was only a short diverticulum, and that the allantois 

 formed a large pei"sistent sac, which, like the sac of the amnion, did 



