No. 1.] ORIGIN OF HUMAN MONSTERS. 209 
central nervous system is markedly dilated and filled with 
round cells. In front the walls are broken and the round 
cells are extended into the tissues of the front of the head. 
The eye and ear vesicles are also dilated and filled with round 
cells. No trace of a lens is seen, and the ear vesicle has two 
sprouts on its ventral side. The whole epidermis is intact. 
No. 310. 
Ovum, 18x 14 xX 14 mm. 
Dr. Watson, Baltimore. 
The specimen is covered with villi which in sections proved 
to be markedly changed. The mesoderm is hyaline, with 
vacuoles in which there are free nuclei. The epithelial layer 
is irregular and invades the wall of the chorion as well as 
Fic. 310a.—Exterior of the ovum. X 2 times. 
Fic. 310b.—Interior of a piece of the ovum, showing a large lump of 
magma. XX 2 times. 
