894 THE AMERICAN NATURALIST. [VoL. XXXIII. 
Placenta of Tarsius and of Tupaja. — Professor A. A. W. 
Hubrecht! has made a careful study of the placentas of Tarsius 
and of Tupaja to determine whether these organs are centers for 
the formation of blood corpuscles (hematopoetic organs). He 
concludes that blood corpuscles are produced on both the maternal 
and embryonic sides of the placenta and that many of the cor- 
puscles which are produced from embryonic tissue make their way 
into the maternal circulation. The bearing of this on questions 
of telegony is obvious, though it must not be forgotten that in some 
mammals this kind of blood formation does not occur. G, H. P. 
Uterus masculinus of the Rabbit. — Professor Ramsay Wright? 
confirms Kolliker’s statement that the so-called uzerus masculinus in 
the rabbit is formed from the fused caudal ends of the Wolffian 
ducts and not from the Miillerian ducts as might be inferred from its 
name. The organ then is not homologous with the vagina of the 
female nor with the uterus masculinus in man. Cc He 
Fossil Hyracoid. — Professor H. F. Osborn ° has described a new 
species of fossil Hyrax, Pliohyrax kruppii, from the Lower Pliocene 
of Samos. The specimen is interesting in being the only well- 
established fossil remains of this peculiar group. Cup 
Bipedal Lacertilia. — Mr. W. Saville-Kent* has collected evidence 
on bipedal locomotion among existing lizards and finds that it may 
be assumed by the following species: Chlamydosaurus kingi, Phy- 
signathus leseuri, Amphibolurus muricatus, Agama stellio, Teguexin 
americanus, Ameiva surinamensis (according to Mr. H. Prestoe), and 
Basiliscus americanus (W. F. H. Rosenberg). Presumably this habit 
has been inherited from some such ancestor as the extinct bipedal 
Dinosauria. G. H. P. 
1 Hubrecht, A. A. W. Ueber die Entwickelung der Placenta von Tarsius und 
Tupaja, Proc. Fourth Internat. Congress Zoöl., pp. 345-411, 12 pls. 18 
2 Wright, R. On the So-called Uterus masculinus of the Rabbit, Pa. Fourth 
Internat. Congress Zoöl., p. 185. 1899. 
Osborn, H. F. On Pliohyrax kruppii Osborn, a Fossil hyracoid, from 
Samos, Lovit Pliocene, in the Stuttgart Collection, Proc. Fourth Internat. Con- 
pa Zool., pp. 172, 173, I pL 1899. 
t Saville-Kent, W. Bipedal Locomotion among Existing Lizards, Proc. 
Fourth Internat. Congress Zoöl., pp. 168, 169. 1899. 
