10; CARL G. HARTMAN 
No. 208. Caught Jan. 29; Jan. 30, 11:30 a.m., removed left uterus 
containing 4 eggs: 3 unfertilized, measuring in alcohol 1.1 mm., and 
one young bilaminar blastocyst measuring in salt solution 0.85 mm., 
“in alcohol 0.8 mm.; size of vesicle in salt 0.65 x 0.6 x 0.5 mm. (figs. 10, 
10A, and 10B, pl. 19). 
No: 208’. Killed Jan. 31, 1:45 p.m. (interval 26% hours); right 
uterus yielded 8 eggs: one unfertilized, one defective vesicle, 1.25 mm. 
in diameter, and others like No. 205’, measuring in salt solution 1.30, 
1.45, 1.59, 1.59, 1.94, 2.85 mm. 
No. 214 (D. marsupialis). Received from south Texas, Feb. 1; 
operated Feb. 2; a dozen or more undivided, unfertilized eggs, a slight 
degeneration apparent only after sectioning. 
No. 214’. Feb. 6, right uterus removed, leaving right ovary; 14 large 
eggs with opaque shell membrane, dense albumen and fragmenting ova 
(interval 4 days). Killed Feb. 28; after 22 days the completely 
hysterectomized and semi-spayed animal had again come into heat. 
No. 256. Removed three pouch young Feb. 9; 10 days later, numer- 
ous small eggs in early stage of degeneration were found in uteri. 
No. 285. Caught Jan. 12; injured. Jan. 13, 10:25 p.m., 10 eggs: 2 
unfertilized, the remainder small blastocysts partially lined with ento- 
2QODOQVOP 
Fig. 3. <A, B, and C, three eggs of litter No. 285; D, E, and F, three eggs of 
litter No. 285’, sketched alive in Ringer’s solution with the aid of the camera 
lucida: <8! 
derm; eggs measured 0.85 to 0.9 mm. in salt solution; no preparations 
made of this litter (text fig. 3, A to C). 
No. 285’. Killed Jan. 14, 12:30 p.m. (interval 14 hours); 14 eggs: 3 
unfertilized; others as illustrated by D, E, and F, text figure 3; ento- 
dermal lining complete (least advanced, figs. 3, 3A, and 3B, pl. 20; 
most advanced in figs. 7 and 7A, pl. 21). 
No. 287. Jan. 15, 8:15 a.m.; 7 or more eggs (the collection contains 
7 preparations) undivided, unfertilized, little or no signs of disin- 
tegration (fig. 6, pl. 13; fig. 19, pl. 14). 
No. 287’. Jan. 18, 6 p.m. (interval nearly 33 days); 13 clear, hyaline 
eggs, disintegration evident in ovum. 
No. 290. Copulation during night of Jan. 11 to 12; motile two- 
headed spermatozoa recovered from vagina A.M., Jan. 12; Jan. 17, 
8:45 p.m., 5 eggs: one unfertilized; 2 with small thick-walled vesicles 
at one pole, abnormal (compare No. 290 (8), fig. 2, pl. 6); 2 eggs with 
normal bilaminar vesicles occupying about one-half of the egg (compare 
290 (4), fig. 2, pl. 6; fig. 6, pl. 12). 
No. 290’. Killed Jan. 18, 4:30 p.m. (interval 192 hours); 8 eggs: 
2 unfertilized; one retarded blastocyst; 5 apparently normal bilaminar 
