1884.] 



OF TEIKACEROS QUADRICORNIS. 



Fig. 3. 



One extremity of chorion of Tetraccros qnadncoriiiit. 

 al., allantoic diTerticulum ; co., cotyledon; r., its raised rim ; di., diffuse -vas- 

 cular ridges ; b., crown of blood-vessel, shown by greater prominence of 

 ridges ; v., small patch of cotyledoruu-y villi. 



Fig. 4. 



u.ql 



Maternal cdlyledon of Tcfraceroa. 

 II, gl., mouths of uterine glands. 



