250 



ELEMENTS OF HISTOLOGY. [Chap.xxxi. 



middle piece, and terminating as the tail, has been ob- 

 served (H. Gibbes). 



328. The seminal tubules of each compartment 

 or lobule empty themselves into a short, more or less 

 straight, tubule the vas rectum. -* This is narrower 



Fig. 139. Various kiuds of Spermatozoa. 



A. Spermatozoon of guinea-pig not yet completely ripe ; B, the same seenside- 

 Vays, the head <>f the spermatozoon la flattened from side to ide ; c. a 

 spermatozoon of the horse ; D, a spermatozoon of the newt. 



than the seminal tubule, and is lined with a single 

 layer of polyhedral or short columnar epithelial cells. 

 The vasa recta form, in the corpus Highmori, a dense 

 network of tubular channels, which are irregular in 

 diameter, being at one place narrow clefts, at another 

 wide tubes, but never so wide as the seminal tubules ; 

 this network of channels is the rete testis. 



329. (2) The epididymis. From the rete testis 

 we pass into the vasa efferentia^ each being a tube 



