No. 1.] ORIGIN OF HUMAN MONSTERS. 255 
rest of the structures (heart, ceelom and Wolffian body) are 
quite sharply defined, but are all infiltrated with round cells. 
Most of the epidermis is intact. The arm buds are well 
defined. 
No. 255. 
Ovum, 20 x 20 x 10 mm. 
Professor Brodel, Baltimore. 
The villi are atrophic and fibrous. At points the syncytial 
layer is well mixed with leucocytes, which also have invaded 
some of the villi as well as the mesoderm of the chorion. The 
whole chorion was cut into serial sections, but no trace of an 
embryo was found. ‘There are no blood-vessels in the chorion, 
nor were any remnants of the amnion found. 
No. 257. 
Ovum, 55 x 40 x 40 mm., with a pedicle within, 14 x 2 
mm., to which is attached a body 4 x 0.5 mm. 
Fic. 257.—Photograph of the specimen. > 1.5 times. 
