378 LEWIS HENRY GOUGH. 



directly into the vagina. I have never observed an intro- 

 mission of the cirrus into the vagina. The cirrus muscles 

 consist almost entirely of a circular muscle ; the longitudinal 

 muscle usually observed between the circular muscle and the 

 cirrus appears to be wanting or extremely weak. Cirrus and 

 vas deferens within the cirrus pouch are suspended by loose 

 parenchym cells, which stretch themselves from the walls of 

 the pouch, passing around and gripping the vas deferens. 

 They act as a kind of mesentery in function (fig. 50). 



The muscles of the cirrus pouch are very feeble. The 

 whole cirrus apparatus gives one the impression that the 

 cestode has lost the habit of cross-fertilisation, and that self- 

 fertilisation has become the rule. 



Conclusions. 



(1) There is no subcuticula in the suckers. 



(2) The cuticula can arise independently of the subcuticula. 

 (o) The subcuticular cells stand in direct connection with 



the dorsoventral and transverse muscles and form part of them. 



(4) The parenchyma muscles are produced by three kinds 

 of myoblasts : (a) Bipolar myoblasts with terminal fibrilla3 ; 

 {h) bipolar myoblasts with lateral fibrilla ; (r) elongate 

 bipolar myoblasts lying axially in the tubiform muscles of the 

 longitudinal muscle. 



(5) The dorsal canals are surrounded by nephrocytes, which 

 are homologous with the parent cells of the llame-cells. 



(6) There are ganglion cells in the suckers, connected by 

 neurofibrillse Avith the " Sommer-Landois " cells of the 

 subcuticular muscles of the sucker. 



(7) In addition to oocytes, nutritive cells are produced in 

 the ovaries. ' 



(8) The oocytes mature before leaving the ovarium. 



(9) The oocytes arrive fertilised in the uterus. 



(10) The oocytes in the uterus are surrounded by nutritive 

 cells of uterine origin. 



(11) The paruterine organ is contained in a pouch of the 

 uterus, and arises within the uterus; its structure is lamellar. 



