108 MALL. [VoL. XIX. 
The specimens of the fourth week cannot be considered in 
the sequence given in Table IX, for a number of them are 
straightened and, therefore, measure larger than others that 
‘are more advanced in development but curled up in their 
natural shape. This, I think, is well shown in the various 
illustrations. However, it is clear that Nos. 334, 285, 312, 
336 and 347 are decidedly larger than the rest, about the 
same stage of development as the normal specimen No. 2, and, 
therefore, about twenty-eight days old. The rest of the speci- 
mens are younger and belong to the beginning of the fourth 
week. In the first and younger group some of the embryos 
that are straight and measure 8 mm. are a little earlier than 
others that are but 5 mm. long. 
TABLE VIII 
NorMAL EmBryos OF THE FourtH WEEK. 
E 
Specimen. Embryo. Chorion, 2 & 
g <q 
Ss 
mm. mm. days 
INGOs SOs civere niet 5 24x18x8 
iSiC)2)) ere 5 20X15 
His (W) 5 25 X 20 2I 
Rist (IRS) Aare renee che 5 22 
WERE 55 ab o400 05 Boe 22 18 
No. 19 S55 TOM LA. 
NOs TOi syereeretieres 6 24x18 
INO}, 2akers ars asioranens 6 40 X 40 ir 
NOtP2 4S actu tence 6 58 
Steubenrauch (1). 6 45 
Ion (Secon oto 2 cexeny ao 54 
NOMITTO ses eos 6.5 28 X 20X10 55 
INOS 2s fade evens 7 BS xe)5 52 
INO wES Ss cease 7 18 x 18 
INO:aNS Tirana 7 64 
Steubenrauch (11) 7 51 
Hist (B)F a, sesnes 7 25 X 22 
Eis ei(Sti)ieeese. ve A 2E X17 57 
Meyer \it sedis 8 45 28 
INGOs 22a a ee 8 40 X 33 X 33 
No. 2odi.2 te oF 8 22X11 X11 49 
