Fig. 41. A median longitudinal, or sagittal section through a rabbit em- 

 bryo, at the end of the twelfth day. The section is a strictly median one 

 except in two respects , the cerebral hemisphere of the left .side has been 

 introduced in order to render the figure more complete ; and the Wolffian 

 body and ureter of the right side. The terminal portion of the tail has 

 been removed. 



BF, Cavity of fore-brain or tbalamencephalon. 



BH, Cavity of hind brain, or fourth ventricle. BL, Cerebellum 



BM, Cavity of mid-brain. BS, Cavity of cerebral hemisphere or 



lateral ventricle. CH, Notochord. GP, Post-anal gut. 

 IN, Finger-like process of infundibulum. KC, Wolffian duct 

 KD, Ureter. KM, Wolffian bodv. LE, Epiglottis 

 LG, Lung. LR, Trachea. PN, Pineal bodv. PT, Pituitary body 

 RS, vSinus venosus. RT, Truncus arteriosus. 



RV, Ventricle of heart. T, Glottis. TA, Stalk of allantois, cut short 

 TC, Cloaca. TA, Thyroid body. TO, CEsophagus. TP Pharynx 

 W, Liver. WD, Bile duct. YK, Yolk stalk, cut short. 



(Marshall). 



