NEW MAI.LOl'll AGA. ISl 



convoluted in the portion lying between the testes and 

 their proxiuial ends. The vesiculu seniinalis is ex- 

 panded and fi)ur-lobed at its distal end, two lobes being 

 situated on each side of the median line. From each 

 of the two inner lobes a short twisted blind tube runs 

 forward. The posterior end is rather pointed and 

 passes into the ejaculatory duct. Tliis duct is long and 

 narrow, and is thrown into numerous convolutions, 

 which, however, all lie between the vesicula seminalis 

 and the external genital opening. The vasa deferentia 

 open into the base of the ductus ejaculatorius. 



The following are examples of the male organs of the 

 Ischnocera. In EurynietopuH t<tuni.'< (plate xiii, tig. 8) 

 the testes (t) are four in number, two on each side. 

 Each is a small pear-shaped organ having the taper- 

 ing end terminated by a tine thread. The two on each 

 side are closely connected by a rather wide commissure. 

 They lie in the lateral part of the body cavity in the 

 third and fourth abdominal segments close to the dorsal 

 wall, witli their long axes in an antero-posterior direc- 

 tion. From the inner side of the commissure connect- 

 ing the testicles the vas deferens {vd) arises. It is a 

 narrow tube passing first backward and inward ami 

 then forward and inward till it reaches the seminal ves- 

 icle {i^i'). Each duct enters the base of this organ on 

 its own side. The vesicula is much the same as in 

 Phi/Hostomuni and Coljjoce/ihahim, it being partially 

 divided into a right and loft lohv liy a median furrow. 

 Each half is then ajjain divided bv median dorsal and 

 ventral furrows on its surface. The two middle lobes of 

 the four thus produced project farther forward than the 

 lateral ones. Near the posterior end of the organ the 

 four furrows cease and the ductus ejaculatorius {>)) 

 takes its origin from a very short, undivided portion 



