120 SEXUAL ORGANS. 



In examining the monotremate type, we may take an Arion 

 or Glanclina, in which we find successively^ : — 



1. An ovotestis or hermaphrodite gland. This is lobulated, 

 and its follicles bear the ovules on the exterior and the spermatic 

 cellules on the interior, the production of these elements not being 

 always simultaneous. They come together at the opening of 

 each lobule. 



2. The excretory canal ; which is tortuous and ends at the 

 posterior extremity of the deferent canal and of the matrix, in 

 the neighborhood of the albuminiparous gland. 



3. This voluminous gland is yellowish white, and much dis- 

 tended at the period of reproduction. Its tissues are but slightly 

 resistant and secrete a thick liquid in which swim some globules 

 and granulations. It is supposed that the product of this gland 

 envelops the eggs as they arrive at the matrix — into a posterior 

 dilatation of which its excretory canal opens. At this point, or 

 bordering on the excretory canal of the ovotestis and the 

 excretory canal of the albuminiparous gland, commences the 

 separation of the genital roads ; afterwards the sperms and the 

 ovu^les follow distinct rou^tes. 



4. The uterus or matrix, an intestiniform canal, which adheres 

 throughout to the first portion of the deferent canal : in the 

 dilations of its walls are found well-developed eggs. 



5. When the uterus is separated from the deferent canal, it 

 takes the name of vagina, and borders on a vestibule which 

 opens without. 



6. Into the vagina or vestibule is inserted the more or less 

 long receptaculum seminis or copulatory pouch, containing the 

 sperms after copulation. 



t. The vestibule or cloaca is a more or less spacious sac into 

 which open the vagina, the canal of the receptaculum and the 

 verge, and which itself opens by the external genital orifice, 

 placed usually behind the right tentacle. 



8. Returning to the deferent canal, we find it divided into two 

 distinct portions, an adhering posterior or prostatic and an 

 anterior or free portion. The posterior part is joined to the 

 concave margin of the uterus : its walls, which are not always 

 complete, are exteriorly invested with a quantity of glandular 

 follicles. The anterior part of the canal is very narrow and 

 tortuous, and terminates in the sac of the verge. 



9. The sack of the verge (penis) is oblong, cylindrical. A 

 retractor muscle is placed near its posterior cul-de-sac. The 

 verge opens as we have said in the vestibule. 



Such are the fundamental portions of the most simple repro- 

 ductive apparatus ; but in a great number of other androgyna, 

 they become complicated by the addition of accessory organs. 



At the extremity of the excretorj^ canal of the ovotestis, and 



