368 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



external peritoneal covering is present or not. In a 

 paper recently published in the Zoologischer Anzeiger, 

 Dr. Bohumil Cejka (1913) gives a short account of the 

 structure of Litorea Jcrumbachi, in which he deals with 

 the vas deferens. From his description of the histological 

 structure of this tube, I am inclined to think he has seen 

 something of the structure which I have attempted to 

 describe. He says, for instance, that two regions are 

 recognisable. In a transverse section of the first part of 

 the duct he describes the tube as circular and the lumen 

 as being provided with strong cilia. At the periphery he 

 has seen black fibrils, which he believes play an 

 important part in contraction. The second part of the 

 tube, he says, is not ciliated, and has thicker walls which 

 are composed entirely of gland cells — a structure which is 

 quite different from that just described for Tubifex 

 rivulorum. 



3. The Spermiducal Gland with the Prostate. This 

 gland has the form of an elongated, somewhat pear- 

 shaped and curved sac, into the broader end of which 

 opens the second part of the vas deferens, while the 

 narrower end communicates with the exterior by the 

 penis, which will be described later. The cavity of the 

 spermiducal gland is a direct continuation of the cavity 

 of the vas deferens, and is also continuous with that of 

 the penis (PI. VII, fig. 45). We may, therefore, 

 consider the gland and penis as being modified portions of 

 the sperm duct. Attached to the gland at one side, and 

 near its swollen extremity, is a glandular, irregularly- 

 shaped, lobate mass forming what is known as the 

 prostate (PI. VII, fig. 45, pr.). The cells of which the 

 prostate is composed are large and pear-shaped, with 

 prominent rounded nuclei situated usually in the swollen 

 part of the cell. The narrower part of each cell forms its 



