590 



REPTILIA. 



ruptured ovisacs of the ovaria in the same way as those of Mam- 

 malia are seized by the fimbriated extremities of the Fallopian 

 tubes. The first portion of the Fig. 267. 



oviduct is thin and intestini- 

 form; but lower down, where the 

 investments of the egg are form- 

 ed, its walls become thicker, and 

 assume a glandular character 

 (n> o, p) : they finally open into 

 the cloaca; and the mode of their 

 termination in the Tortoise is ex- 

 hibited in the accompanying fi- 

 gure, where (M, m, e M) indicate 

 the terminal portion of the right 

 oviduct laid open ; the left (a M, 

 b M) being shown through its 

 entire length. 



(656.) The formation of the 

 egg and the developementof the 

 embryo is similar in all the ovi- 

 parous Vertebrata ; it will there- 

 fore be more convenient, and 

 prevent unnecessary repetition, 

 if we defer the consideration of 

 this important subject to the 



next chapter ; the reader bearing in mind that in all essential par- 

 ticulars the details which will be given there, when we come to 

 consider the growth of the bird in ovo, are equally applicable to 

 the Chelonian, Ophidian, and Saurian Reptiles. 



