
614 THE AMERICAN NATURALIST. 
one set opening into the upper bladder and a second, much 
larger, opening into the lower bladder. The bladders had 
the usual shape, but inwardly the mucous membrane formed 
a partial partition, near which the two sets of ureters opened. 
There were also two pairs of testes, one of which were resting 
on or quite near the kidneys and the other had descended 
and were “just at the entrance of the inner abdominal ring." ! 
This case is much like that of the calf, — the union of the 
two intestines, the four ureters, and the two bladders, one 
in front of the other; it is not clear that the outer pair 
opened into the hinder bladder, but that seems to be intended. 
The account of the anatomy of the kidneys leaves somewhat 
to be desired ; apparently the fission of the embryonic material 
had not gone so far here as in the calf specimen as to the 
kidneys, while it had as to the ducts. The relation of the testes 
and the ducts seems to have been about the same as in the calf. 
BIOLOGICAL LABORATORY, HAMLINE UNIVERSITY, 
SAINT PAUL, MINN., April 2, 1902. 
LITERATURE REFERRED TO. 
'96 BARBOUR, E. H. A Two-Headed Turtle. Science. Vol. IV, p. 159. 
'94 BATESON, W. Materials for the Study of Variation. 
'00 BRADLEY. Dichotomy as a Factor in Teratogeny. Veterinary 
Journal. Vol. li. | 
'90 CREIGHTON, CHARLES. Article “Monster.” Zucyc. Brit. 
‘66 FISHER, G. H. Diploteratology. Trans. N.Y. Med. Soc. 
'97 GouLD and Pyrr. Anomalies and Curiosities of Medicine. W. B. 
Saunders. 
'01 HEKTOEN AND RIESMAN. American Text-Book of Pathology. W. B. 
Saunders. : 
'00 LINDSEY, JoHN. A Monstrous Foetus. The Veterinarian. Vol. lxxiii. 
'66 WYMAN, JEFFRIES. Description of a Double Fetus. Bost. Med. 
and Surg. Journ. 
! Partly quoted and partly condensed from Wyman’s paper. 

