Development of the Jugular Lymph Sacs. 181 
LIST OF MATERIAL EXAMINED. 
SOMITES SERIES | MILLIMETERS SERIES | MILLIMETERS SERIES MILLIMETERS SERIES 
I eg wer 3 12 ie kG 12 
13 86 8 Sox 12 97° .| 16 15 
eeS.5 102 — be ao 100 | 16 95 
Millimeters Scries| 8.5 T5A| 12 Zl 4 16 96 
45 Baile 5 12.5 Boh. AG 222 
5 134 9 elena ean Dt 16 224 
5 ie 9 106 | 13 35 | 16 230 
5 ATS 10) 136s" I> ES 92 | 16.5 197 
5 + 30-40. -9:5 D Spale? 107 | 16.5 240 
Bo ieee O s5 239 13.5 MG6-7|. 31% 23 
5.18 (SBP) 10 Ee alia fe 189°") 17 36 
5.6 110 | 10 79 2185 223 17 94 
5.7 103° - |) 416 101 14 ese 142 
6 CA t6 111 14 SAE 17 190 
6 85. | <10 142-0}, 14 GALLI 17 
6 115 10 ASI 14: 122 | 18 41520 
6 116 | 10 TAN 14 1272 ule 19 87 
6 i alltel 140 | 14 210 18 88 
6 128 | 10 237 14 Fi Liltne Wels 10 
6 rey 1083 81 14 212) 218.5 21 
6.2 109 |- 10.5 GE D140 2A 199 
6.5 130 | 10.5 120 | 14.5 eae a9 80 
6.5 131 | 10.7 474(Har-| 14.5 38 | 20 83 
6.5 129 vardEmbryological 15 53 21 242 
6.5 186 (Collection). 15 53 | 22 16 
6.8 LOS) 1d 6 | 15 "fs eae 22 
7 iBSecbee th rey | a Oi» |i 25 44 
if mater tl Fefh 15 216 25 147 
7 adie bt Final abs FAS | 31 144 
7 135 | 11 98 |-15 F19 -|- +34 168 
7 11S ype ee 313. | 15 243 | 35 90 
ier 108) 4) 125 29. | 15 244 | 37.5 99 
2 119112 1 15.5 141 | 45 14 
7.2 Pipi 24 | 15.5 143 | 51 104 
7.25 Clee ees 55) sag 215 
7.50 Sos ie 26 245 | 
The measurement of each embryo was made after fixation. All 
measurements of embryos referred to in this paper represent the 
distance between the crown of the head and the baseof the tail 
(Crown-rump measurement). 
Series 1 to 74 belong to the Princeton Embryological Collection, 
